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post #1 of (permalink) Old 11-11-2001, 10:49 PM Thread Starter
 
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YZ250 won\'t start

My 89 yz250 just won't start. Plug is good, I know gas is getting there, what will temperature do? I'm new with 2 strokes so I'm a little lost. It's about 35 degrees out, will this matter much? It will start and run if it's pulled behind a truck and the clutch is let out. What do I need to change the jets to?

97' 2 Door Blazer, 31x10.5 BFG A/T KO's,
2" PA Lift, Air-Aid Intake, Custom 3' muffler.
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post #2 of (permalink) Old 11-11-2001, 11:19 PM
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Re: YZ250 won\'t start

when you try and start it and it doesnt start do you pull the plug and it looks like it all wet???

yah temp with make it harder to start, exspecially on something bigger than a 125,

is the choke circuit working, might be plugged up not letting enough fuel in, is the float set right, maybe getting to much fuel, air filter could be dirty, rider may not be used to the starteing procedure of the bike, kick from top dead center and go all the way through the stroke,

there are som many things it could be, since its an older bike, carb could be all gunked up, and jets and any and all passages should be cleaned out, you dont need new jets just run some realy fine wire throug them to clean them out, the cabe strands off a throttle cabe or something similar will work.

give me more info on the bike and ill try and help you more

Evan


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post #3 of (permalink) Old 11-12-2001, 03:51 AM
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Re: YZ250 won\'t start

So then after you get it started and running from pulling it behind a truck will it start again when you turn it off???

Yes, low temps will make a bike a little bit harder to start.

Is the filter clean??

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post #4 of (permalink) Old 11-12-2001, 03:36 PM
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Re: YZ250 won\'t start

how much compresson does it have? it may not have enough to keep running.

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post #5 of (permalink) Old 11-12-2001, 09:42 PM
 
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Re: YZ250 won\'t start

yeah i would check the compression too...it may not have enough to start when its kicked over but when its bump started it spins fatser so it is able to start..

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post #6 of (permalink) Old 11-12-2001, 11:11 PM Thread Starter
 
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Re: YZ250 won\'t start

No, after it's pulled behind a truck and starts, I can start it back up (2-4 kicks) after I kill it. But if it's left over night, same stupid problem. And yes, there is fuel getting to the engine. I took it apart and noticed that the piston has some wiggle room at the bottom of the sleeve. Could this be it? Would a bore out and matching piston solve the problem?

97' 2 Door Blazer, 31x10.5 BFG A/T KO's,
2" PA Lift, Air-Aid Intake, Custom 3' muffler.
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post #7 of (permalink) Old 11-12-2001, 11:24 PM
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Re: YZ250 won\'t start

has it ever been rebuilt??

could be way off BUT.... sure it isn't the kill button??

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post #8 of (permalink) Old 11-13-2001, 10:56 PM Thread Starter
 
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Re: YZ250 won\'t start

No it's not the kill switch, I also noticed that the clip that held the power valve in place was loose. I'm gettin it bored and matched so it should solve most problems. And no it's never been rebuilt.

97' 2 Door Blazer, 31x10.5 BFG A/T KO's,
2" PA Lift, Air-Aid Intake, Custom 3' muffler.
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post #9 of (permalink) Old 11-20-2001, 06:25 AM
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Re: YZ250 won\'t start

Get it rebuilt like you said. At the same time make sure the power valve gets serviced. Either by you or a mech. Clean and inspect the carb and reed block. Clean the air filter. Make sure your gas pre-mix is correct. New plug.
Check the rotor and stator for security and position. Make sure no oil is leaking on it from the rotor shaft while your there. Check the carb boot for cracks and clean the air filter.
Oh yeah, when did it start to run poorly? Was anything don to it prior to that? Bike maintenance is ongoing. There is always something to do. Good Luck!!

post #10 of (permalink) Old 11-25-2001, 07:43 PM Thread Starter
 
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Re: YZ250 won\'t start

I think it was an overall lack of maintainance. Get the wisco piston an jug back this week. An edge of the reed is broke off, it's just a little chunk, will this matter? What do new plastic parts of the reed cost?

97' 2 Door Blazer, 31x10.5 BFG A/T KO's,
2" PA Lift, Air-Aid Intake, Custom 3' muffler.
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