Starting an RM125 Build - Need Tips

Dopeman
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84
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7/10/2016
Location
New York, IL
Hi Everyone,

Ive been reading here a lot and gained many pearls and 2 cents out of this forum,
time i give my share back

i did 2 builds so far one is YZ125 2005 and the other is CR250 2012 AF which i have in my photo,
this time i want to invest more and get some trick mods and parts for the RM, but i dont really know how to start with this one

i picked this bike out of someone that rebuilt the motor complete with the power valve assambley
so engine is ready to go just need base gasket and oem piston rather then pro-x one that the bike have now..

ive been searching for parts forever but all is expansive and i dont feel like it will be worth it.
i need some info on whats the best way to rebuild this bike, what carb to put on him, does 144 kits really worth it ?
should i keep my fork and rear shock ? what other mods can be done to this bike ?

i searched a discussion about RM125 and so far mostly is hidden away about this bike,
if someone rebuilt this bike and can share some light i will be more then thankful (:
the bike is RM125 2004



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Kx125rider
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USA
7/10/2016 10:32am
As far as carbs, the pwk air striker is known to be good, or you could spend some more for a lectron. I would have the stock suspension setup for you. If you wanted to go all out you could buy an a kit, im not sure which years mount up. I also know there is a brand that makes an aluminum tank that uses the rmz shrouds, Im sure some other members can chime in on that.
colintrax
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Taylorsville, GA, USA
7/10/2016 10:37am
Can't help you much, but if pro-x isn't OEM on that bike. Its just as good
Dopeman
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New York, IL
7/10/2016 1:05pm
A-kit is def on the lookout but fitment i believe will be issue with this year and make.
Could you be more specific about the lectron carb ? which size is it and where to buy it, also today i took the bike apart and i noticed i have Keihin cables that connect to the carb but i have a mikuni carb and the cables just hang there not connected to nothing... so i think someone switched carbs on this bike..

The Shop

7/10/2016 3:07pm
Suzuki parts are really expensive and a lot of them on back order. Also aftermarket part availability isn't as readily available as other bikes.

A kits are practically non existent for the bike anymore or they have been hammered to shit.

The suspension is pretty good stock once it's been re worked. I was lucky and stole internals from a 2006 rm 250 form that has bigger fork pistons then the stock 2004 rm 125 fork pistons.
Slosh 112
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Location
Mackay QLD, AU
7/11/2016 11:43am
Yes as dbrunksi125 said, apart from pipes, reed valves and graphics kits there is basically diddly squat out there for RM125's in the aftermarket world. I had to make my own Motostuff 280mm brake kit from two different models and modify a lot of other parts off different makes to get what I wanted.

Actually Ride Engineering also make 22 & 20mm offset triple clamps in black and red. They are direct fitment for RM-Z250/450 2011 - Present & RM125/250 2001 - last model (ill have to double check those years on the box) so That leads me to believe that RMZ forks could be slid into the stock triples which will give you a bigger selection of suspension.

7/11/2016 12:09pm
I'm not positive, but to run rmz forks like 2009 and up I believe you have to bore out bottom clamps 1mm and run rmz front wheel.

I think those ride clamps fit 2003 to 2007 rm 126 and 2006 to 2009 or 2010 rmz actually. Then the 2011 or whatever and up rmz clamps the bottom clamp diameter is 1mm bigger.

Russ B is the guy to ask on here. He's done this mod. Mount Rmz A Kit Forks on his 2008 Rm 250.
Dopeman
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Location
New York, IL
7/11/2016 3:46pm
So we are getting started with this thing, we took apart the bike today,
ive decided to keep the original bore as im not gonna race this bike.

i orderd a scalvini pipe and muffler, and will be using a lectron carb.
about the suspension i decided to rebuild it and re anodize the fork tubes and rear shock.
when i open the engine today all seem very clean and new, all motor is new so thats awesome save for me,
i have excel wheels that im going to anodize aswell, hubs will be PC because new hubs cost so much !

so far i managed to find only 1 supplier of triple clamp for the RM and thats Applied, they charge 420$ for full triple so im going to buy the upper clamp only and paint the lower clamp same color.
im not trying to save too much cash on this build but it really seems RM parts do cost a lot more :\
anyway updates will be along the way promise (:
any comments are welcomed

the bike



the "stuff" hehe



im going to polish the head & cylinder & covers & rear swing arm
cylinder head and covers will be anodized, cylinder will have the gloss chrome look to it.


any tips on how to remove the anodize from the front forks and how to mask the tube holes when anodizing will be great, or, do you leave the tube in the anodize tank with holes open ? is it safe for the inside to be coated in dye anodize ?
is hard anodize just normal anodize without dye ?
thanks (:
7/11/2016 4:01pm
Should order 2005 and up rm 125 clamps from applied. Press them into your 2004 steering stem. In 2004 rm 125 had 24.5 mm offset clamps. In 2005 they switched to 22.5 mm offset. Makes a world a difference in cornering
Dopeman
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New York, IL
7/11/2016 5:35pm
Are you sure 05 and up will fit my steering stem and forks ?
Also does it make a difference for good or worse ? i mean offset is something riders can get used to or 22.5 is just better ?
7/11/2016 5:50pm
100% will work. steering stem is the same model from 2004 to when they discontinued the rm 125.
NorcalVet
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Nor-cal, CA, USA
7/11/2016 6:49pm Edited Date/Time 7/11/2016 6:51pm
Check out Lucca here

Great service / very good pricing on CF
Here's a pic of a clutch cover for my RM 250 I picked up
- nice guy, he'll do pkg pricing (saves $$ w/ shipping)

He has / or will make other stuff not listed
- just email him


njracer46
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USA
7/11/2016 6:55pm
What is the difference between k 1-6 when looking up oem parts?
Bruce372
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7/11/2016 9:34pm
Get the power valve governor from the 2005 so the exhaust open at the right time.

The 2005 head, cylinder and power valves are setup a little better also.

The 144 kit rips on the rm better than any mod and works really well with the center power valve setup.
Slosh 112
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Mackay QLD, AU
7/11/2016 10:00pm Edited Date/Time 7/12/2016 2:34am
If your fork tubes are in good condition and you don't need to smooth out a heap of stone chips or corrosion then just send them to your Anodizer an they will remove the original coating as part of re anodizing something. I can't speak for every anodising place but that's what I was top by the place I sent mine.

Now as far as plugging the tubes or leaving them open you will get conflicting advice. I left mine open. A few people will swear that you need to plug them so that the process doesn't increase the thickness of the tube thus decreasing the ID of the tube. Hard anodising is a surface treatment not a surface coating like chrome, the thickness changes would be almost un measurable. I measured mine before and after anodising and there was no difference.

If you need to polish your tubes before sending them away, then the best way is to do it on a lathe with gradually finer sand paper until you get to 2000 grit wet an dry and then polish them. It's best to get a short billet of aluminium that is the same OD of your fork tubes at the seal carrier end and machine a 5mm wide spigot that is a slip for for the ID on the seal carrier and grip the billet in the lathe so you can polish right upto the edge, then use a center taper to keep it centalised.

RussB
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GB
7/12/2016 12:45am
I'm not positive, but to run rmz forks like 2009 and up I believe you have to bore out bottom clamps 1mm and run rmz front...
I'm not positive, but to run rmz forks like 2009 and up I believe you have to bore out bottom clamps 1mm and run rmz front wheel.

I think those ride clamps fit 2003 to 2007 rm 126 and 2006 to 2009 or 2010 rmz actually. Then the 2011 or whatever and up rmz clamps the bottom clamp diameter is 1mm bigger.

Russ B is the guy to ask on here. He's done this mod. Mount Rmz A Kit Forks on his 2008 Rm 250.
Can't say for 04 clamps, but 05 onwards RM's will take an RMZ front end once 1mm is bored out of the lower clamp. You can still use the RM brake system, just need an RMZ front wheel and axel for RMZ forks.

Ebay will be your friend when trying to restore an RM125, you get nice things pop up on there from time to time.

Check out the 2 stroke Suzuki section of Thumpertalk if you haven't already, some great info on there.
KPRacing is the man over there, he does some great work to RM125's and has a lot of knowledge for tuning and getting them running awesome
PRM31
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Northern, VA, USA
7/12/2016 8:06am
I'm rebuilding an '05 right now. So far, parts have not been an issue. Motosport.com is your friend. As for mods, I'm having Eric Gorr rebuild the engine and add the 144 kit. Factory Connection rebuilt the suspension and revalved/resprung it as well. All bearings are being replaced, the frame was powdercoated (looks great!), new bars, clutch perch and all new plastic including '14 front fender.

Will definitely check out the contacts listed above as well.
7/12/2016 10:45am
Bearings, pistons, rings, clutch fibers and plates, cranks etc are all available. But lots of other parts are on back order. Motosport just doesn't update what's not available for the bike.

For instance, parts of the power valve assembly are no longer available to order as well as some transmission parts.

I know I waited few weeks for a carb slide and stator for my 04 rm 125. I'm sure slosh waited a while too for the compression adjuster he ordered as well.
Slosh 112
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Mackay QLD, AU
7/12/2016 12:33pm
Kx125rider wrote:
Topar makes a bunch of billet parts for the rm125
http://shoptoparracing.com/brands/Suzuki.html
!!!Why am I just finding this now?!! I think i might actually buy their rear mc extension and a case saver, ignition cover looks good too and not too bad pricing. What is their quality like? pictures look good.
Slosh 112
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Location
Mackay QLD, AU
7/12/2016 12:40pm
Bearings, pistons, rings, clutch fibers and plates, cranks etc are all available. But lots of other parts are on back order. Motosport just doesn't update what's...
Bearings, pistons, rings, clutch fibers and plates, cranks etc are all available. But lots of other parts are on back order. Motosport just doesn't update what's not available for the bike.

For instance, parts of the power valve assembly are no longer available to order as well as some transmission parts.

I know I waited few weeks for a carb slide and stator for my 04 rm 125. I'm sure slosh waited a while too for the compression adjuster he ordered as well.
Yes a lot of parts are hard to get or un available and expensive compared to Honda or Yamaha. I see Honda guys on here rebuild suspension linkages with all OEM bearings and seals, if you did that with a Suzuki you would be broke AF. Took a month for my rear compression adjuster to arrive, similar issue with things like transmission drain plug and clutch hub lock washer held me up for a long time, but not as long as my stupid Lightspeed glide plate...

I'd love to have a spare bike or at least an engine on the shelf.
Kx125rider
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2800
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Location
USA
7/12/2016 1:13pm
Kx125rider wrote:
Topar makes a bunch of billet parts for the rm125
http://shoptoparracing.com/brands/Suzuki.html
Slosh 112 wrote:
!!!Why am I just finding this now?!! I think i might actually buy their rear mc extension and a case saver, ignition cover looks good too...
!!!Why am I just finding this now?!! I think i might actually buy their rear mc extension and a case saver, ignition cover looks good too and not too bad pricing. What is their quality like? pictures look good.
My dad has a case saver from them and it is top notch, I found them through a vurb build.
DuroTools
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755
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Location
Middletown, CT, USA
7/12/2016 7:50pm
Dopeman wrote:
Hi Everyone, Ive been reading here a lot and gained many pearls and 2 cents out of this forum, time i give my share back i...
Hi Everyone,

Ive been reading here a lot and gained many pearls and 2 cents out of this forum,
time i give my share back

i did 2 builds so far one is YZ125 2005 and the other is CR250 2012 AF which i have in my photo,
this time i want to invest more and get some trick mods and parts for the RM, but i dont really know how to start with this one

i picked this bike out of someone that rebuilt the motor complete with the power valve assambley
so engine is ready to go just need base gasket and oem piston rather then pro-x one that the bike have now..

ive been searching for parts forever but all is expansive and i dont feel like it will be worth it.
i need some info on whats the best way to rebuild this bike, what carb to put on him, does 144 kits really worth it ?
should i keep my fork and rear shock ? what other mods can be done to this bike ?

i searched a discussion about RM125 and so far mostly is hidden away about this bike,
if someone rebuilt this bike and can share some light i will be more then thankful (:
the bike is RM125 2004



I have a new in the case "Universal" brand upper triple clamp for an 05 RM125 it's black with stainless hardware also comes with rubber or aluminum (solid) bar mounts. I have the same one on my bike and it's held up well. You'll likely want the upper and lower set but if not and your lookin to save scratch than let me know and I'll attach a pic.
Dopeman
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84
Joined
7/10/2016
Location
New York, IL
7/13/2016 9:44am
Please do (:
DuroTools
Posts
755
Joined
9/9/2015
Location
Middletown, CT, USA
7/13/2016 2:00pm
Dopeman wrote:
Please do (:
Heres some pics of same one on my bike and the one in the case. I have two sets actually, one is 7/8 and the other is 1 1/8". If interested I'll send you a private message with my info and we'll talk price. I was gonna put them on ebay soon but haven't researched price yet so not sure what it's worth so open to an offer if you like it.





wpark89
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1163
Joined
12/9/2009
Location
Mattawa, WA, USA
7/15/2016 7:26am
I thought I'd post in this thread to catch some of you Rm 125 guys.

I'm in need of 5th gear driven for an 06 rm 125. They're back ordered from Suzuki. I'm trying to get a bike together for the 125 dream race invitational at the Washougal national. Please let me know asap if anyone can help.

Thanks

7/15/2016 7:35am
wpark89 wrote:
I thought I'd post in this thread to catch some of you Rm 125 guys. I'm in need of 5th gear driven for an 06 rm...
I thought I'd post in this thread to catch some of you Rm 125 guys.

I'm in need of 5th gear driven for an 06 rm 125. They're back ordered from Suzuki. I'm trying to get a bike together for the 125 dream race invitational at the Washougal national. Please let me know asap if anyone can help.

Thanks

That blows. Like are you still able to eventually get one just the back order will effect making the Washougal race? Or is the part discontinued?

This is exactly why I recently purchased an entire good used rm 125 tranny within the last 2 weeks and sent it out for isf finishing...

Hope you find the parts you need!
wpark89
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Location
Mattawa, WA, USA
7/15/2016 9:19am
I'm not sure. Suzuki just says there are none available in the country and I have no idea when there will be more.

7/15/2016 9:27am
wpark89 wrote:
I'm not sure. Suzuki just says there are none available in the country and I have no idea when there will be more.

They didn't give you a back order time estimate? If thats the case then you likely can't order one anymore. Try to find used transmission or parts bike then...
Dopeman
Posts
84
Joined
7/10/2016
Location
New York, IL
7/18/2016 8:45am
Ok some updates, got the frame, hubs and spring from the PC shop,
turned out killer yellow !







i was afraid the yellow will be too much neon, and it looks like my fear has come true.
so this kinda changes my direction with this build.

im gonna anodize the rear frame and swing arm in black and my execl rims to blue.
ive seen some other cat have done a flo yellow build on a RM250, it turned out killer but he was right all that neon and black took all the bike looks, you can never know it an RM at first look...
anyway, im hoping to put as many blue & neon on the bike so it wont be black and dull, its not a 450 ghost rider just yet hehe..

any suggestions for fork tube color ? gold ? grey ? black ?? Wink

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