1998 yz 250 won’t start

ncarr52
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ncarr52
Edited Date/Time 8/2/2020 6:20pm
My bike won’t cold start I have to pull start it then warm it up then I can kick start it just fine and it fouls plugs like a beast if someone can help it would be great
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ncarr52
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ncarr52 8/2/2020 6:35pm
8/2/2020 6:35pm
smashingpumpkins167 wrote:
It needs spark, fuel, and compression
It has all of those it will only kick start when it’s warm and Im trying to get it to cold start
mattyhamz2 8/2/2020 6:35pm
8/2/2020 6:35pm
smashingpumpkins167 wrote:
It needs spark, fuel, and compression
ncarr52 wrote:
It has all of those it will only kick start when it’s warm and Im trying to get it to cold start
Have you recently done any work to it?
ncarr52
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Caledonia, MI US
ncarr52 8/2/2020 6:38pm
8/2/2020 6:38pm
smashingpumpkins167 wrote:
It needs spark, fuel, and compression
ncarr52 wrote:
It has all of those it will only kick start when it’s warm and Im trying to get it to cold start
mattyhamz2 wrote:
Have you recently done any work to it?
Only put a new silencer on it

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mattyhamz2 8/2/2020 6:43pm
8/2/2020 6:43pm
ncarr52 wrote:
It has all of those it will only kick start when it’s warm and Im trying to get it to cold start
mattyhamz2 wrote:
Have you recently done any work to it?
ncarr52 wrote:
Only put a new silencer on it
Just saw your other thread you started yesterday. Like someone else said, replace your main seals because it’s cheap insurance.
Next work on jetting. The 1998 carb sucked! I got so frustrated with mine that I replaced it with a carb from a 99.
ncarr52
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ncarr52 8/2/2020 6:44pm
8/2/2020 6:44pm
mattyhamz2 wrote:
Have you recently done any work to it?
ncarr52 wrote:
Only put a new silencer on it
mattyhamz2 wrote:
Just saw your other thread you started yesterday. Like someone else said, replace your main seals because it’s cheap insurance. Next work on jetting. The 1998...
Just saw your other thread you started yesterday. Like someone else said, replace your main seals because it’s cheap insurance.
Next work on jetting. The 1998 carb sucked! I got so frustrated with mine that I replaced it with a carb from a 99.
Okay thanks
MotofactioN
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MotofactioN 8/2/2020 6:49pm
8/2/2020 6:49pm
You need wrenching experience. Get off the phone a put a wrench in your hand and a beer in the other. Thank me later Whistling
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kr
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kr 8/2/2020 7:05pm
8/2/2020 7:05pm
My 96 had that problem, weak spark. Replaced the black box and cured it. Good luck
Gravel
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Gravel 8/2/2020 7:10pm
8/2/2020 7:10pm
kr wrote:
My 96 had that problem, weak spark. Replaced the black box and cured it. Good luck
KR could totally be right, but even if a new box gets it running, clean the carb and replace the crank seal anyway..
Paw Paw
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Paw Paw 8/2/2020 7:16pm
8/2/2020 7:16pm
Have you done a compression test on your bike? If compression is low it will be very hard to start cold, but easier to start when warm.
Leaking carb float needle can allow excess fuel to build up in the crank cavity when not running, making it hard to start when cold. Float level set too high will also cause this.
What color is the spark? Bright Blue, Yellow, Red, White or Orange?
Have you done a leak test? How long did it hold 6psi when cold? When hot?
Fresh fuel mix?

Paw Paw
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