94' 250 Ignition No Spark

Hall911B · Post by **Hall911B** » February 12th, 2012, 2:35 pm

I'm trying to use a 94 stator/flywheel with my stock 94 500 CDI. I tried 2 different stators and still no spark. I still have the stock 500 coil, could that be the problem? Runs fine with all 500 parts. Wires all match and yes i have checked Ohms. Any help would be appreciated. thanks.

cmotodad · Post by **cmotodad** » February 12th, 2012, 5:28 pm

I tried the 500 cdi on my 96 ignition and could not get the bike to fire. As soon as I went back to the 250, fired right up. No idea why, some say they have tried the 500 cdi with no problems.

Hall911B · Post by **Hall911B** » February 12th, 2012, 6:05 pm

Thanks for the input Cmoto nice to know its not just me. Mine is a 94 motor and i'm gonna look around on ebay to compare 500 stators and maybe if they look the same as my 94 250 stator then maybe that year 500 cdi will work with the 250 setup. there is a huge Ohm difference between the 94' 250/500 stators.
250 = 234 ohms
500 = 37 ohms
Maybe thats what the Cdi doesnt like. Really dont want the softer hit of the 250 Cdi since i only MX.
Consensus is that the 250 setup is softer on bottom and more on top, wonder how that would work with a Gnarly pipe instead of my PC?

2strokeforever · Post by **2strokeforever** » February 12th, 2012, 7:12 pm

Consensus is that the 250 setup is softer on bottom and more on top

the softer on the bottom is mostly caused by the lighter flywheel

wonder how that would work with a Gnarly pipe

works good

the 500 cdi and 250 flywheel dies at idle (stalls) so easy its stupid....

if youre determined to run the 500cdi/250 flywheel get 99 stator and flywheel, ive tested this combo and it does work with my 2001 cr500 cdi
it will require you to re wire the cdi to make the right wires connect, also you will have to run the stator full retarded (this leaves it 1.5 degrees advanced over stock), or it will have way too much advance

or get the complete 99 250 setup and run it full advanced, you wont be disapointed

Hall911B · Post by **Hall911B** » February 13th, 2012, 10:33 am

Thanks for the input 2t, i appreciate it.

Hall911B · Post by **Hall911B** » February 15th, 2012, 6:19 pm

Just a little update, purchased a 94 cr2 CDI/Coil to go with the 94' Stator/FW. Voila', it started on the 2nd kick and ran great. Not really sure if it changed the powerband much. I advanced it as far as the stock slots would allow just to start somewhere. its about 50 degrees out and it didnt ping (was jetted good to start with). Cant give an opinion on cornering since i just played around in a wet grass field. Gonna have first OTHG race this sunday so i'm looking forward to some track testing. thanks again for the tips.

Post by **AlisoBob** » February 15th, 2012, 6:37 pm

2strokeforever wrote:
Consensus is that the 250 setup is softer on bottom and more on top
the softer on the bottom is mostly caused by the lighter flywheel

Light flywheel = hard bottom end hit ( spools up easier)

Heavy flywheel ( or weighted one) softens the bottom end due to extra mass absorbing the crank impulse

If you think the 250R ignition feels softer, its the timing curve.

2strokeforever · Post by **2strokeforever** » February 15th, 2012, 9:16 pm

i ran the complete 500 ignition, rode for an hour, came back to the truck, then replaced just the flywheel and stator with the 250 stuff ( and re timed it so it was running the same advance) , then i rode another hour

and i noticed a little less bottom end, i mean less than 2500-3000rpm, after that it roasted the tire like it was free

dont believe me, try it

quicfix500 · Post by **quicfix500** » February 16th, 2012, 8:15 am

AlisoBob wrote:
2strokeforever wrote:
Consensus is that the 250 setup is softer on bottom and more on top
the softer on the bottom is mostly caused by the lighter flywheel

Light flywheel = hard bottom end hit ( spools up easier)

Heavy flywheel ( or weighted one) softens the bottom end due to extra mass absorbing the crank impulse

If you think the 250R ignition feels softer, its the timing curve.

BINGO!!

coley13 · Post by **coley13** » February 17th, 2012, 11:51 am

Hall911B wrote:Thanks for the input Cmoto nice to know its not just me. Mine is a 94 motor and i'm gonna look around on ebay to compare 500 stators and maybe if they look the same as my 94 250 stator then maybe that year 500 cdi will work with the 250 setup. there is a huge Ohm difference between the 94' 250/500 stators.
250 = 234 ohms
500 = 37 ohms
Maybe thats what the Cdi doesnt like. Really dont want the softer hit of the 250 Cdi since i only MX.
Consensus is that the 250 setup is softer on bottom and more on top, wonder how that would work with a Gnarly pipe instead of my PC?

how did you come up with them figures?

500 ignition pulse generator is 180 - 280 ohms
500 exciter is 1-40 ohms.

wonder if the wiring from the 94 stator are colour coded/ plug socket combo are reversed to that of the 500. Might be simply a matter of swapping the wires over

Hall911B · Post by **Hall911B** » February 17th, 2012, 12:23 pm

Hey Coley, good catch and i hate posting bogus info. Thats what i get for multitasking (chewing gum while working on bike) and being frustrated. i just rechecked and maybe my fluke 78 has seen better days.
500 stator = 21 ohms
250 stator = 173 ohms
which does make sense when comparing the amount of windings. i'm not a wiring wizard so just getting the right part worked for me.

powermizer · Post by **powermizer** » February 19th, 2012, 10:58 pm

I would really like to know the answer to this? I too have the 94 stuff and cant get it to run with the 500 CDI. I wonder if we used the 94 500 CDI if it would work. I would really like this bike to hit harder at the bottom. I miss my 88 500, lol. coly it might be worth a shot at changing wires , I will look into it.

Hall911B · Post by **Hall911B** » February 20th, 2012, 12:12 am

My 94 500 CDI wires matched the 94 250 stator wires but would not work. The Ignitor wires matched also. Unless someone else posts up another 250/500 Cdi combo, probably have to go with 2Strokes combo. I havent messed with it yet but i dont see why the bottom end wouldn't come back if you get the base/ low to mid timing to match the 500's curve. The only real difference should be mid to top where the Cdi starts taking timing away.

2strokeforever · Post by **2strokeforever** » February 20th, 2012, 8:17 pm

just to be clear to run a 99 250 stator and flywheel with the 500 CDI you have to get enough connectors and rewire it, nothing matches up

its not hard, but its hard to make it look clean, i just scraped everything and used a 5 pin trailer connector, get a 5 pin so you dont have to rewire it when you decide to put the 250 cdi back on

also unless you ride dunes only i wouldnt recomend it, it stalls like a KX65 with this combo

good luck getting all the bottom end back..... i tried, and even if somehow you do get it back it stalls so easy that you cant use it without stalling all the time

i say try it, but make sure you try the 250 cdi too,

BannedCR500Riders.com

94' 250 Ignition No Spark

94' 250 Ignition No Spark