Full Tilt CR250 Build - MXA Two Stroke Hall of Fame

blackdiamond
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blackdiamond 8/10/2016 12:44pm
8/10/2016 12:44pm
blackdiamond wrote:
It would definitely hurt performance at low to mid throttle openings because you would sacrifice the ability to run more advance at those lower RPM points...
It would definitely hurt performance at low to mid throttle openings because you would sacrifice the ability to run more advance at those lower RPM points. You have to give to get. Why would you want to do that?
needforspeed78 wrote:
Just speculating, thanks for the reply.
You could test this on the stock CDI by just unplugging the TPS and test riding it. When it is unplugged the ignition defaults to a 2D map.
Energyrail 8/14/2016 7:58pm
8/14/2016 7:58pm
Is your bike no longer jekyll and hyde ? Meaning the way it is stock. Where under load when maybe your a gear too high climbing a hill. And gets on and off then pipe very erratically.
blackdiamond
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blackdiamond 8/15/2016 1:10am
8/15/2016 1:10am
The power delivery has nothing in common with the stock bike whatsoever. Very broad, very linear and much easier to keep on the pipe than the stock bike. I hate to say it but it has a lot in common with a four stroke.
Energyrail 8/16/2016 10:03pm
8/16/2016 10:03pm
Sounds great for enduro.
Should work great with my lowered cyl?

The Shop

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blackdiamond
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blackdiamond 8/16/2016 10:28pm
8/16/2016 10:28pm
Energyrail wrote:
Sounds great for enduro.
Should work great with my lowered cyl?
Are you referring to the ignition?
carl-h
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carl-h 8/16/2016 11:13pm
8/16/2016 11:13pm
Would running the zeel ignition be worth it on a 2002 bike without the TPS. Or would I be able to add a TPS to it along with the ignition?
Energyrail 8/16/2016 11:28pm
8/16/2016 11:28pm
Yes ignition and the better powervalve map more specifically.
Your cyl is lowered some too right?
Energyrail 8/16/2016 11:30pm
8/16/2016 11:30pm
carl-h wrote:
Would running the zeel ignition be worth it on a 2002 bike without the TPS. Or would I be able to add a TPS to it...
Would running the zeel ignition be worth it on a 2002 bike without the TPS. Or would I be able to add a TPS to it along with the ignition?
I'm assuming you could add a carb with a tps in this situation. But i may stand corrected.
blackdiamond
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blackdiamond 8/16/2016 11:34pm
8/16/2016 11:34pm
carl-h wrote:
Would running the zeel ignition be worth it on a 2002 bike without the TPS. Or would I be able to add a TPS to it...
Would running the zeel ignition be worth it on a 2002 bike without the TPS. Or would I be able to add a TPS to it along with the ignition?
Energyrail wrote:
I'm assuming you could add a carb with a tps in this situation. But i may stand corrected.
You just have to run the 2004 and up wiring harness and a carb with a TPS sensor. Different carbs have different wire combinations on the TPS sensor as well. That is an easy fix though.
carl-h
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carl-h 8/17/2016 12:24am
8/17/2016 12:24am
carl-h wrote:
Would running the zeel ignition be worth it on a 2002 bike without the TPS. Or would I be able to add a TPS to it...
Would running the zeel ignition be worth it on a 2002 bike without the TPS. Or would I be able to add a TPS to it along with the ignition?
Energyrail wrote:
I'm assuming you could add a carb with a tps in this situation. But i may stand corrected.
blackdiamond wrote:
You just have to run the 2004 and up wiring harness and a carb with a TPS sensor. Different carbs have different wire combinations on the...
You just have to run the 2004 and up wiring harness and a carb with a TPS sensor. Different carbs have different wire combinations on the TPS sensor as well. That is an easy fix though.
Ahh okay thanks for that. I'm having problems with mine at the minute and my next step may be a new cdi, I was thinking it may be worth fitting the zeel instead? At the moment I would probably run without the TPS but if there's not much advantage to the standard cdi without TPS I may a swell buy a stock one?
blackdiamond
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blackdiamond 8/17/2016 12:40am
8/17/2016 12:40am
carl-h wrote:
Ahh okay thanks for that. I'm having problems with mine at the minute and my next step may be a new cdi, I was thinking it...
Ahh okay thanks for that. I'm having problems with mine at the minute and my next step may be a new cdi, I was thinking it may be worth fitting the zeel instead? At the moment I would probably run without the TPS but if there's not much advantage to the standard cdi without TPS I may a swell buy a stock one?
The most affordable way would be to just replace the OEM unit, they are reasonably priced and you can get them online brand new for less than $200
carl-h
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carl-h 8/17/2016 1:04am
8/17/2016 1:04am
carl-h wrote:
Ahh okay thanks for that. I'm having problems with mine at the minute and my next step may be a new cdi, I was thinking it...
Ahh okay thanks for that. I'm having problems with mine at the minute and my next step may be a new cdi, I was thinking it may be worth fitting the zeel instead? At the moment I would probably run without the TPS but if there's not much advantage to the standard cdi without TPS I may a swell buy a stock one?
blackdiamond wrote:
The most affordable way would be to just replace the OEM unit, they are reasonably priced and you can get them online brand new for less...
The most affordable way would be to just replace the OEM unit, they are reasonably priced and you can get them online brand new for less than $200
Okay cheers I'll have aloof round. I'm in the uk but getting one from the US wouldn't be a problem
Energyrail 8/17/2016 10:13am
8/17/2016 10:13am Edited Date/Time 8/17/2016 10:15am
Did you buy your zealtronic from fast ftom the past? Or direct from zealtronic?
blackdiamond
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blackdiamond 8/17/2016 10:24am
8/17/2016 10:24am
Energyrail wrote:
Did you buy your zealtronic from fast ftom the past? Or direct from zealtronic?
Call Jim Henshaw at Fast From the Past. He is great to work with.
Steely Dan
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Steely Dan 8/18/2016 11:58am
8/18/2016 11:58am
This dude went to great lengths to build this bike, nickel-plated the peg mounts even..

And what did MXA do?


....add a tooth to the rear.

I got to that part and spit out my drink hahaha
1
dean122
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dean122 8/18/2016 12:45pm
8/18/2016 12:45pm
Steely Dan wrote:
This dude went to great lengths to build this bike, nickel-plated the peg mounts even.. And what did MXA do? ....add a tooth to the rear...
This dude went to great lengths to build this bike, nickel-plated the peg mounts even..

And what did MXA do?


....add a tooth to the rear.

I got to that part and spit out my drink hahaha
I was dying when I read that also.
cslacker
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cslacker 8/18/2016 12:53pm
8/18/2016 12:53pm
Steely Dan wrote:
This dude went to great lengths to build this bike, nickel-plated the peg mounts even.. And what did MXA do? ....add a tooth to the rear...
This dude went to great lengths to build this bike, nickel-plated the peg mounts even..

And what did MXA do?


....add a tooth to the rear.

I got to that part and spit out my drink hahaha
dean122 wrote:
I was dying when I read that also.
Hey, they drop a tooth in the rear on the test of the new 250sx...

Pit Row

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blackdiamond
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blackdiamond 8/18/2016 1:14pm
8/18/2016 1:14pm
Steely Dan wrote:
This dude went to great lengths to build this bike, nickel-plated the peg mounts even.. And what did MXA do? ....add a tooth to the rear...
This dude went to great lengths to build this bike, nickel-plated the peg mounts even..

And what did MXA do?


....add a tooth to the rear.

I got to that part and spit out my drink hahaha
dean122 wrote:
I was dying when I read that also.
cslacker wrote:
Hey, they drop a tooth in the rear on the test of the new 250sx...
I am not sure if they changed the gearing when they tested it on that sand track, but the day that I went to Glen Helen with them to test we ran my gearing (14/51)
cslacker
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cslacker 8/18/2016 1:19pm
8/18/2016 1:19pm
blackdiamond wrote:
I am not sure if they changed the gearing when they tested it on that sand track, but the day that I went to Glen Helen...
I am not sure if they changed the gearing when they tested it on that sand track, but the day that I went to Glen Helen with them to test we ran my gearing (14/51)
I'm running 13/48 which is pretty close to your gearing and it works great. The low end is strong enough that I was able to pull most hills in the mountains in 2nd gear this past weekend that 450s were downshifting to 1st for.

Energyrail 8/18/2016 6:11pm
8/18/2016 6:11pm
blackdiamond wrote:
I am not sure if they changed the gearing when they tested it on that sand track, but the day that I went to Glen Helen...
I am not sure if they changed the gearing when they tested it on that sand track, but the day that I went to Glen Helen with them to test we ran my gearing (14/51)
cslacker wrote:
I'm running 13/48 which is pretty close to your gearing and it works great. The low end is strong enough that I was able to pull...
I'm running 13/48 which is pretty close to your gearing and it works great. The low end is strong enough that I was able to pull most hills in the mountains in 2nd gear this past weekend that 450s were downshifting to 1st for.

What's your setup otherwise?
blackdiamond
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blackdiamond 8/18/2016 8:10pm
8/18/2016 8:10pm
Energyrail wrote:
What's your setup otherwise?
The 14/51 works really well IMO.
Energyrail 8/18/2016 9:09pm
8/18/2016 9:09pm
I was just wondering what was done to his motor .
The Rock
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The Rock 8/18/2016 10:02pm
8/18/2016 10:02pm
Steely Dan wrote:
This dude went to great lengths to build this bike, nickel-plated the peg mounts even.. And what did MXA do? ....add a tooth to the rear...
This dude went to great lengths to build this bike, nickel-plated the peg mounts even..

And what did MXA do?


....add a tooth to the rear.

I got to that part and spit out my drink hahaha
dean122 wrote:
I was dying when I read that also.
cslacker wrote:
Hey, they drop a tooth in the rear on the test of the new 250sx...
Stock bikes are geared for the masses and that includes off road. No great wonder a magazine focused on racing motocross would recommend lowering the gearing slightly.

My first year at Mammoth circa 90 Marty Tripes was searching for a new rear sprocket so he could pull a higher gear in a section.

#allsprocketsmatter
cslacker
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cslacker 8/18/2016 10:03pm
8/18/2016 10:03pm
Energyrail wrote:
I was just wondering what was done to his motor .
Same cylinder and pv work as bd according to Varner. No case matching or shortening of intake. Stock piston, pipe with pc factory sound exhaust and v force 3. I have both a pwk and a lectron. I ran the lectron this last ride for comparison. I have been playing with carbs a bunch and the lectron is starting to move ahead in my mind but mostly because of gas mileage. Power is similar with the edge going to the lectron because of overrev.
cslacker
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cslacker 8/18/2016 10:07pm
8/18/2016 10:07pm Edited Date/Time 8/18/2016 10:11pm
The Rock wrote:
Stock bikes are geared for the masses and that includes off road. No great wonder a magazine focused on racing motocross would recommend lowering the gearing...
Stock bikes are geared for the masses and that includes off road. No great wonder a magazine focused on racing motocross would recommend lowering the gearing slightly.

My first year at Mammoth circa 90 Marty Tripes was searching for a new rear sprocket so he could pull a higher gear in a section.

#allsprocketsmatter
I'm not knocking mxa. Gearing is a personal choice. The 03 cr250 was judged pretty harshly by most for having way too tall of gearing for the poor stock low end power. I am just impressed that when massaged a bit it pulls the stock 13/48 gearing perfectly. Pretty sure in 04 they went to a 13/49 because of all the complaints and stuck with it through 07.
The Rock
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The Rock 8/19/2016 1:23am
8/19/2016 1:23am
What a cool project. Interesting comment about liking the Lecfron due to gas mileage. Are you trying to run as little fuel as possible?

When I raced a lot it always bugged me I ran with too much fuel. Thought of ways to calculate required fuel load to minimize weight but never progressed past the thought stage.
Steely Dan
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Steely Dan 8/19/2016 5:46am
8/19/2016 5:46am
The carburetion of the Lectron is far and away better than a standard carb. That's why it gets better fuel economy. It atomizes the fuel so much better that it uses less to achieve the same air/fuel ratio.

The trick with those is to set the metering rod so that it will only idle with the idle screw turned all the way in as far as it will go. So basically, turn your idle screw clockwise until it stops, then set your metering rod so the bike will idle at about 1,800-2,000 rpms (sounds high, but two-strokes idle differently). That is the "sweet spot" that gets rid of the partial throttle hiccup.
ocscottie
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ocscottie 8/19/2016 6:33am
8/19/2016 6:33am
blackdiamond wrote:
MXA just posted the full article they did for the magazine online Monday for anyone who hasn't seen the print version.

http://motocrossactionmag.com/news/bike-test-we-ride-the-ultimate-honda…
Good stuff bro, just finished reading the article, they did a good job and explaining almost everything (ive followed this thread since the beginning)

This pic is so rad Cool

Travis_Hudson 8/19/2016 7:27am
8/19/2016 7:27am
Energyrail wrote:
What's your setup otherwise?
blackdiamond wrote:
The 14/51 works really well IMO.
I'm sorry I can't remember, did you modify the chain guide? I seem to remember there being not much room for anything over a 50t on this scoot.

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