1998 yz 250 won’t start

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8/2/2020 5:43 PM

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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8/2/2020 6:32 PM

It needs spark, fuel, and compression

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Instagram: vanillaice782
Amateur helmet painter

8/2/2020 6:35 PM

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

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8/2/2020 6:35 PM

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?

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2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F

80% of the time it works every time
IG @hammerfamily_4 & @2HRacing
Thanks to : Factory Effex, N2Dirt, Acerbis, DT1, Fasthouse, Matix, FMF, ASV, 100% & Mika Metals

8/2/2020 6:38 PM

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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8/2/2020 6:43 PM

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.

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2017 RMZ450
2005 YZ250-sold :,(
1998 YZ250
2005 KX250F

80% of the time it works every time
IG @hammerfamily_4 & @2HRacing
Thanks to : Factory Effex, N2Dirt, Acerbis, DT1, Fasthouse, Matix, FMF, ASV, 100% & Mika Metals

8/2/2020 6:44 PM

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 carb sucked! I got so frustrated with mine that I replaced it with a carb from a 99.

Okay thanks

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8/2/2020 6:49 PM

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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8/2/2020 7:05 PM

My 96 had that problem, weak spark. Replaced the black box and cured it. Good luck

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8/2/2020 7:10 PM

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..

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8/2/2020 7:16 PM

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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