03 cr 125 question

burb
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burb
Edited Date/Time 1/25/2012 7:22pm
I'm currently doing a full rebuild and I will have pictures when its done but do pro circuit radiator hoses for a 2007 fit an 03
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mxpunk
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mxpunk 10/18/2011 6:58pm
10/18/2011 6:58pm
yes

that bike is slow as shit
burb
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burb 10/18/2011 7:21pm
10/18/2011 7:21pm
Putting a gorr kit on it
mxpunk
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mxpunk 10/18/2011 7:22pm
10/18/2011 7:22pm
burb wrote:
Putting a gorr kit on it
gorr kit cr125 = fast a a 2003 ktm125 with a worn out top end

they're good solid bikes for a beginner but they're so fucking slow they barely get out of their own way.

if you can ride one of these fast you can fly on a 125 that actually moves! lol
Cygnus
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Cygnus 10/18/2011 7:23pm
10/18/2011 7:23pm
mxpunk wrote:
yes

that bike is slow as shit
Wait what? All I have heard it's not the bike it's the rider.

The Shop

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Flatliner
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Flatliner 10/18/2011 7:27pm
10/18/2011 7:27pm
In before someone post's decotis vid.
mxpunk
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mxpunk 10/18/2011 7:34pm
10/18/2011 7:34pm Edited Date/Time 10/18/2011 7:35pm
mxpunk wrote:
yes

that bike is slow as shit
Cygnus wrote:
Wait what? All I have heard it's not the bike it's the rider.
when i stopped riding my friend was faster then me on his 03 cr125 and i had an 01 cr250

regardless, my 03 rm125 was WAY faster then his cr125 and all we had on our bikes were exhaust

i had a PC platinum w/ a r304 silencer

he had a fmf fatty w/ a powercore II ...bike was a ROOOACH! the motor has no hit and it revs slow as shit...but the rest of the bike is AWESOME..super reliable, handles good turns good....if this bike was actually fast it would of beat the YZ out every year but it always came in last in mag shootouts bc the motor was lame
Premixed
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Premixed 10/18/2011 8:08pm
10/18/2011 8:08pm
the best modification for an 03 CR125 is a 500 motor.
pt046
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pt046 10/18/2011 8:17pm
10/18/2011 8:17pm
burb wrote:
Putting a gorr kit on it
Let me know how it runs with the big bore kit. I've got an 06 with ported Gorr motor and although its much better than stock, it's still slow.
Cygnus
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Cygnus 10/18/2011 8:19pm
10/18/2011 8:19pm
burb wrote:
Putting a gorr kit on it
pt046 wrote:
Let me know how it runs with the big bore kit. I've got an 06 with ported Gorr motor and although its much better than stock...
Let me know how it runs with the big bore kit. I've got an 06 with ported Gorr motor and although its much better than stock, it's still slow.
I thought I read that the cases need to be stuffed to get these engines to run right. Did you have that done?
mxpunk
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mxpunk 10/18/2011 8:46pm
10/18/2011 8:46pm
burb wrote:
Putting a gorr kit on it
pt046 wrote:
Let me know how it runs with the big bore kit. I've got an 06 with ported Gorr motor and although its much better than stock...
Let me know how it runs with the big bore kit. I've got an 06 with ported Gorr motor and although its much better than stock, it's still slow.
Cygnus wrote:
I thought I read that the cases need to be stuffed to get these engines to run right. Did you have that done?
In 2003 MXA had a cover shot with then Factory Connections Ryan Mills ?? or maybe Michael Byrne's Factory CR125

if you look closely at the back of the cylinder, you can see the welds that they did to stuff a bigger reed cage in there to get it to make more power.
Dnlp D952
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Dnlp D952 10/18/2011 9:35pm
10/18/2011 9:35pm
burb wrote:
Putting a gorr kit on it
pt046 wrote:
Let me know how it runs with the big bore kit. I've got an 06 with ported Gorr motor and although its much better than stock...
Let me know how it runs with the big bore kit. I've got an 06 with ported Gorr motor and although its much better than stock, it's still slow.
Cygnus wrote:
I thought I read that the cases need to be stuffed to get these engines to run right. Did you have that done?
I think that's the 250 with the case reed motor, but the 125's got no guts...
burb
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burb 10/18/2011 9:40pm
10/18/2011 9:40pm
I bought the thing for 600 bucks so either way I'm stocked it should be all done by next week with the 134 kit ill try and get some go pro footage on it
Mod Killer
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Mod Killer 10/19/2011 12:40pm
10/19/2011 12:40pm
burb wrote:
Putting a gorr kit on it
mxpunk wrote:
gorr kit cr125 = fast a a 2003 ktm125 with a worn out top end they're good solid bikes for a beginner but they're so fucking...
gorr kit cr125 = fast a a 2003 ktm125 with a worn out top end

they're good solid bikes for a beginner but they're so fucking slow they barely get out of their own way.

if you can ride one of these fast you can fly on a 125 that actually moves! lol
can someone please explain to me what makes a bike go from fast to "slow as shit" from year to year.


there arent that big of changes with these motors from year to year. its not like the engine design changes drastically from year to year.

maybe the port timing is changed a little.....but its not like we're talking entirely new engine layout are we?

and how come the variances in port layout are never taken into consideration? when being as picky as we are here, we all know that no two 2stroke engines perform exactly the same. couldnt some simple port/cylinder cleanup save any born-bad 2stroke from being a absolute dog?

and if the motor doesnt rev........why not change the gearing to make it seem like its reving? honestly, how many times are you gonna be 6th gear pinned on a mx track? not often if ever so gear the thing down and it should come to life shouldnt it?


i just dont see how the engines can change that much from year to year in performance. can someone please explain the variables (significant differences between a 01, 02, 03, 04 etc) and why or if my simple solutions would or wouldnt work. thx.


its funny. every year when a new bike comes out, and a magazine does a test or we see someone riding it at the track for the first time......someone inevitably states how much more powerful it feels, looks, or sounds. im inclined to believe that 95% of the time this is due to the fact that its simply a NEW BIKE with a fresh motor and the thing you and i are on has at least a years worth of abuse done to it! so of course anything new is going to seem like a major improvement.



btw, this burb dude sounds like a real douche. i hope i see him at the track this weekend.
burn1986
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burn1986 10/19/2011 12:52pm
10/19/2011 12:52pm
mxpunk wrote:
yes

that bike is slow as shit
MXA voted this year the best of the aluminum-framed CR125s. There's some air-intake stuff that makes these run excellent. Contact Miedosoracing.
Cygnus
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Cygnus 10/19/2011 1:00pm
10/19/2011 1:00pm
burb wrote:
Putting a gorr kit on it
mxpunk wrote:
gorr kit cr125 = fast a a 2003 ktm125 with a worn out top end they're good solid bikes for a beginner but they're so fucking...
gorr kit cr125 = fast a a 2003 ktm125 with a worn out top end

they're good solid bikes for a beginner but they're so fucking slow they barely get out of their own way.

if you can ride one of these fast you can fly on a 125 that actually moves! lol
Mod Killer wrote:
can someone please explain to me what makes a bike go from fast to "slow as shit" from year to year. there arent that big of...
can someone please explain to me what makes a bike go from fast to "slow as shit" from year to year.


there arent that big of changes with these motors from year to year. its not like the engine design changes drastically from year to year.

maybe the port timing is changed a little.....but its not like we're talking entirely new engine layout are we?

and how come the variances in port layout are never taken into consideration? when being as picky as we are here, we all know that no two 2stroke engines perform exactly the same. couldnt some simple port/cylinder cleanup save any born-bad 2stroke from being a absolute dog?

and if the motor doesnt rev........why not change the gearing to make it seem like its reving? honestly, how many times are you gonna be 6th gear pinned on a mx track? not often if ever so gear the thing down and it should come to life shouldnt it?


i just dont see how the engines can change that much from year to year in performance. can someone please explain the variables (significant differences between a 01, 02, 03, 04 etc) and why or if my simple solutions would or wouldnt work. thx.


its funny. every year when a new bike comes out, and a magazine does a test or we see someone riding it at the track for the first time......someone inevitably states how much more powerful it feels, looks, or sounds. im inclined to believe that 95% of the time this is due to the fact that its simply a NEW BIKE with a fresh motor and the thing you and i are on has at least a years worth of abuse done to it! so of course anything new is going to seem like a major improvement.



btw, this burb dude sounds like a real douche. i hope i see him at the track this weekend.
The conspiracy theorists will tell you Honda did it on purpose to lead more people to the mighty 4 stroke.
burn1986
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burn1986 10/19/2011 1:41pm
10/19/2011 1:41pm
Well, that's actually true.
yota
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yota 10/19/2011 2:21pm
10/19/2011 2:21pm
ditch the mikuni for an airstryker.
put on the 07 airbox to carb boot.
install some 1" vents in the airbox.
134cc overbore with porting, headwork and powervalve mod by Harris Performance was a big improvement also (:
mxpunk
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mxpunk 10/19/2011 2:33pm
10/19/2011 2:33pm
burb wrote:
Putting a gorr kit on it
mxpunk wrote:
gorr kit cr125 = fast a a 2003 ktm125 with a worn out top end they're good solid bikes for a beginner but they're so fucking...
gorr kit cr125 = fast a a 2003 ktm125 with a worn out top end

they're good solid bikes for a beginner but they're so fucking slow they barely get out of their own way.

if you can ride one of these fast you can fly on a 125 that actually moves! lol
Mod Killer wrote:
can someone please explain to me what makes a bike go from fast to "slow as shit" from year to year. there arent that big of...
can someone please explain to me what makes a bike go from fast to "slow as shit" from year to year.


there arent that big of changes with these motors from year to year. its not like the engine design changes drastically from year to year.

maybe the port timing is changed a little.....but its not like we're talking entirely new engine layout are we?

and how come the variances in port layout are never taken into consideration? when being as picky as we are here, we all know that no two 2stroke engines perform exactly the same. couldnt some simple port/cylinder cleanup save any born-bad 2stroke from being a absolute dog?

and if the motor doesnt rev........why not change the gearing to make it seem like its reving? honestly, how many times are you gonna be 6th gear pinned on a mx track? not often if ever so gear the thing down and it should come to life shouldnt it?


i just dont see how the engines can change that much from year to year in performance. can someone please explain the variables (significant differences between a 01, 02, 03, 04 etc) and why or if my simple solutions would or wouldnt work. thx.


its funny. every year when a new bike comes out, and a magazine does a test or we see someone riding it at the track for the first time......someone inevitably states how much more powerful it feels, looks, or sounds. im inclined to believe that 95% of the time this is due to the fact that its simply a NEW BIKE with a fresh motor and the thing you and i are on has at least a years worth of abuse done to it! so of course anything new is going to seem like a major improvement.



btw, this burb dude sounds like a real douche. i hope i see him at the track this weekend.
when cr125s had steel frames they were the fastest bikes out there

when they went aluminum.....wow SLOW!!!!

the mags said the bike was slow and i rode one myself and it was slow as shit. the rm125 wasnt the fastest bike in the mid 00's but it was alot faster then this bike!

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DrSweden
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DrSweden 10/19/2011 2:36pm
10/19/2011 2:36pm
Mod Killer wrote:
can someone please explain to me what makes a bike go from fast to "slow as shit" from year to year. there arent that big of...
can someone please explain to me what makes a bike go from fast to "slow as shit" from year to year.


there arent that big of changes with these motors from year to year. its not like the engine design changes drastically from year to year.

maybe the port timing is changed a little.....but its not like we're talking entirely new engine layout are we?

and how come the variances in port layout are never taken into consideration? when being as picky as we are here, we all know that no two 2stroke engines perform exactly the same. couldnt some simple port/cylinder cleanup save any born-bad 2stroke from being a absolute dog?

and if the motor doesnt rev........why not change the gearing to make it seem like its reving? honestly, how many times are you gonna be 6th gear pinned on a mx track? not often if ever so gear the thing down and it should come to life shouldnt it?


i just dont see how the engines can change that much from year to year in performance. can someone please explain the variables (significant differences between a 01, 02, 03, 04 etc) and why or if my simple solutions would or wouldnt work. thx.


its funny. every year when a new bike comes out, and a magazine does a test or we see someone riding it at the track for the first time......someone inevitably states how much more powerful it feels, looks, or sounds. im inclined to believe that 95% of the time this is due to the fact that its simply a NEW BIKE with a fresh motor and the thing you and i are on has at least a years worth of abuse done to it! so of course anything new is going to seem like a major improvement.



btw, this burb dude sounds like a real douche. i hope i see him at the track this weekend.
True that. Every year sounds like they reinvented the wheel.

I really wish that every person that bitch and moaned about lack of power posted a vid of them "suffering" on the same bike. It's pretty rare to see really fast people riding a bikes to it's limit, that would actually be benefitted by upgrades. At least that's how I see it.

Honestly, the only bike I have ever felt I mastered completely was a totally beat low compression worn out 15 year old CR125 from 91...
miedosoracing1 10/19/2011 2:43pm
10/19/2011 2:43pm Edited Date/Time 10/19/2011 2:47pm
burb wrote:
Putting a gorr kit on it
mxpunk wrote:
gorr kit cr125 = fast a a 2003 ktm125 with a worn out top end they're good solid bikes for a beginner but they're so fucking...
gorr kit cr125 = fast a a 2003 ktm125 with a worn out top end

they're good solid bikes for a beginner but they're so fucking slow they barely get out of their own way.

if you can ride one of these fast you can fly on a 125 that actually moves! lol
Mod Killer wrote:
can someone please explain to me what makes a bike go from fast to "slow as shit" from year to year. there arent that big of...
can someone please explain to me what makes a bike go from fast to "slow as shit" from year to year.


there arent that big of changes with these motors from year to year. its not like the engine design changes drastically from year to year.

maybe the port timing is changed a little.....but its not like we're talking entirely new engine layout are we?

and how come the variances in port layout are never taken into consideration? when being as picky as we are here, we all know that no two 2stroke engines perform exactly the same. couldnt some simple port/cylinder cleanup save any born-bad 2stroke from being a absolute dog?

and if the motor doesnt rev........why not change the gearing to make it seem like its reving? honestly, how many times are you gonna be 6th gear pinned on a mx track? not often if ever so gear the thing down and it should come to life shouldnt it?


i just dont see how the engines can change that much from year to year in performance. can someone please explain the variables (significant differences between a 01, 02, 03, 04 etc) and why or if my simple solutions would or wouldnt work. thx.


its funny. every year when a new bike comes out, and a magazine does a test or we see someone riding it at the track for the first time......someone inevitably states how much more powerful it feels, looks, or sounds. im inclined to believe that 95% of the time this is due to the fact that its simply a NEW BIKE with a fresh motor and the thing you and i are on has at least a years worth of abuse done to it! so of course anything new is going to seem like a major improvement.



btw, this burb dude sounds like a real douche. i hope i see him at the track this weekend.
Motors are very similar in all those years 91 throughout. I think 03 or 04 had the worst cover over the crank. There is a part that protrudes over the entire half of the crank, for more pressure buildup. Most all other years, do not have that, so guess it didn't worky. Second, the intake from the box all the way to the motor is messed up. This bike is just messed up completely as far as airflow goes. Conspiracy or not, Honda screwed the pooch. My CR has been messaged from the intake all the way to the exhaust port and cases, plus 144cc E85 Eric Gorr style. Now, I'll take on any 250F. It rocks. 03 unfortunately can't take 144cc. It is 134 or 139cc? Carbs are fine, as an FYI. Just unplug the computer hookup and mod the intake and your life is better. FYI, not the valve part. Everyone thought the Vforce would fix it, but the intake is messed up in more places. Thus, you have me to fix it for $50. :-)
yota
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yota 10/19/2011 2:50pm
10/19/2011 2:50pm
03 boot on the right, 07 on the left.

Premixed
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Premixed 10/19/2011 3:12pm
10/19/2011 3:12pm
this is actually the best part you can put on that bike to improve the speed.

Mod Killer
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Mod Killer 10/19/2011 3:13pm
10/19/2011 3:13pm
miedosoracing1 wrote:
Motors are very similar in all those years 91 throughout. I think 03 or 04 had the worst cover over the crank. There is a part...
Motors are very similar in all those years 91 throughout. I think 03 or 04 had the worst cover over the crank. There is a part that protrudes over the entire half of the crank, for more pressure buildup. Most all other years, do not have that, so guess it didn't worky. Second, the intake from the box all the way to the motor is messed up. This bike is just messed up completely as far as airflow goes. Conspiracy or not, Honda screwed the pooch. My CR has been messaged from the intake all the way to the exhaust port and cases, plus 144cc E85 Eric Gorr style. Now, I'll take on any 250F. It rocks. 03 unfortunately can't take 144cc. It is 134 or 139cc? Carbs are fine, as an FYI. Just unplug the computer hookup and mod the intake and your life is better. FYI, not the valve part. Everyone thought the Vforce would fix it, but the intake is messed up in more places. Thus, you have me to fix it for $50. :-)
thanx. that was the response i was looking for.
Mod Killer
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Mod Killer 10/19/2011 3:14pm
10/19/2011 3:14pm
DrSweden wrote:
True that. Every year sounds like they reinvented the wheel. I really wish that every person that bitch and moaned about lack of power posted a...
True that. Every year sounds like they reinvented the wheel.

I really wish that every person that bitch and moaned about lack of power posted a vid of them "suffering" on the same bike. It's pretty rare to see really fast people riding a bikes to it's limit, that would actually be benefitted by upgrades. At least that's how I see it.

Honestly, the only bike I have ever felt I mastered completely was a totally beat low compression worn out 15 year old CR125 from 91...
hey doc, check ur email.
miedosoracing1 10/19/2011 3:23pm
10/19/2011 3:23pm
Premixed wrote:
this is actually the best part you can put on that bike to improve the speed. [img]http://www.dreamgate.ne.jp/NSR/Project%20NSR/NSR500/part1_08.jpg[/img]
this is actually the best part you can put on that bike to improve the speed.

I don't get the using of a 125 chassis. A CR250 Chassis is so much better. The frame fits better, because it is bigger down below. But more than that, the rear wheel is the bigger size and the front forks are twin chamber. Plus, the springs are closer to being ok. I used CRF250 rear spring, but a 250 just starts out closer in my opinion. :-)
Premixed
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Premixed 10/19/2011 3:54pm
10/19/2011 3:54pm
no, youre right. not to mention that on a 125 frame, the front wheel his a cr500 pipe when the fork is compressed. would suck to land off a jump and rip your pipe in half with the front wheel, and endo. im just being facetious.

i think im going to use the 250F for mine, just because there are thousands of them blown up laying around.
TerryB
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TerryB 10/19/2011 5:12pm
10/19/2011 5:12pm
Dnlp D952 wrote:
I think that's the 250 with the case reed motor, but the 125's got no guts...
I believe all modern 125's, (and smaller), are case-reed. The late model CR250 was the oddball being a case-reed design.

Somebody feel free to correct me if I"m wrong...
mxpunk
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mxpunk 10/19/2011 5:34pm
10/19/2011 5:34pm
Dnlp D952 wrote:
I think that's the 250 with the case reed motor, but the 125's got no guts...
TerryB wrote:
I believe all modern 125's, (and smaller), are case-reed. The late model CR250 was the oddball being a case-reed design. Somebody feel free to correct me...
I believe all modern 125's, (and smaller), are case-reed. The late model CR250 was the oddball being a case-reed design.

Somebody feel free to correct me if I"m wrong...
you're right

i think the early 00-ish ktm 250's were case reed motors as well but these motors were rocket ships
miedosoracing1 10/20/2011 5:06am
10/20/2011 5:06am
Dnlp D952 wrote:
I think that's the 250 with the case reed motor, but the 125's got no guts...
TerryB wrote:
I believe all modern 125's, (and smaller), are case-reed. The late model CR250 was the oddball being a case-reed design. Somebody feel free to correct me...
I believe all modern 125's, (and smaller), are case-reed. The late model CR250 was the oddball being a case-reed design.

Somebody feel free to correct me if I"m wrong...
mxpunk wrote:
you're right

i think the early 00-ish ktm 250's were case reed motors as well but these motors were rocket ships
Anyone know why? If anyone remembers right, I think Honda had a lot of HP up top on the Honda 250. I've heard of karts getting close to 60hp on them. The case reeds are shown to give the most top end, but lack in bottom end. My newer CR250's I was able to achieve very good power on though from bottom too top. It takes alittle more work for the bottom end. But just cleaning up the intakes on the 250 will get you very good top end power. The case reeds on 125's are because they only use the top end. The 250 needs some reed stiffening, intake work, exhaust chamber work etc. It is more work but can be made pretty good. Plus add in the fact that the electronic powervalve was not a good design. Had it been mechanical, the 250 would have been better in my opinion.
Something for everyone to think about. Ride a 1990 CR250 and a 2007 CR250. Totally different power. Ride a 2003 CRF450 and a 2010 CRF450. Totally different power. In both cases, they started with much lower end power, and then by the end, it was much more on top.
Berni
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Berni 10/20/2011 7:08am
10/20/2011 7:08am
I have an cr125 02', and have done some mods to it and it really seems to perform better, I don't know if it really has more top end but at least it didnt lost anything, and now has much more botton end and revs much faster. Here is what I did to it by stages.

First I installed a hgs pipe. It gained over rev and very little top end but not low end (probably it lost)
Second, because stock reeds cracked, I installed Boyessen dual stage reeds (not the cage) it had better response in low end but lost overrev (the bike alredy had carbon fiber reeds when I bought it)
After this I put a thicker base cilinder gasket and removed a little more than I added to the botton, to the head. I didnt noticed any change really.

So the bike stayed like this for a time and recently I did a complete rebuild of the bike after being in the garage for years.

After reading some articles about the problems with this bike, I followed the next steps all at the same timo so I dont know how much each different thing affected the bike:

Installed a pin to stop the exhaust valve from closing so much.
Drilled some holes in the air box
Stuffed the cases just under the cilinder because it was hanging over the cases. I added epoxi where I could in the cases to add pre-compression (you say like that in english??)
Reshaped the intake ports making them to point a little bit in the opposite than the exhaust port.
I removed the spacer from the reed cage.

With all this things I did at the end, it definetelly hits harder in the bottom and revs faster. But not even close to a ktm 125.

At least now it can get out the turns without burning the clutch

Post a reply to: 03 cr 125 question