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New 2002 YZ250F Issues

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Hey guys,

 

Last weekend I picked up a 2002 YZ250F for a pretty good deal.

This is my first dirt bike in 15 years.

When I bought it, the guy started it for me as I was unable to...lol. No I'm not a little guy either.

It wasn't hard to kick over but it just took many tries.

Anywho, I brought it home.

 

Yesterday I replaced the air filter, installed an external fuel screw and changed the oil.

I checked the valve clearances and four were out of spec. (both exhaust, 2 intake)

The ones that were out of spec were all too tight.

So I re-shimmed them all with in spec and put everything back together.

 

Once it was all put back together, it was extremely hard to kick over, I weight 220# and I could stand on the kick starter.

So I pulled the valve cover back off, check the timing and that was perfect. All valves still in spec.

Checked the kick starter again, still hard to kick over. 

Now I put all the old shims back in. It was easier to kick over again. (not too easy, still had compression)

 

Any ideas whats going on with this?

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Is the manual decompressor lever still on the handlebar?

Without it, you would be standing on the kickstart lever, and probably break parts having to do with the kickstarting, eventually.

Edited by YZEtc

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Is it hooked up to the cable which pulls a lever at the front of the cylinder head?

Does pulling the lever feel like you're moving parts under the valve cover?

If not, there's the problem.

 

If so, you pull that lever when the kickstarter stops due to compression pressure and then push the kickstart lever down a couple of inches, let go of the decomp lever, bring the kickstart lever back to the top, and give it a normal kick.

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Is it hooked up to the cable which pulls a lever at the front of the cylinder head?

Does pulling the lever feel like you're moving parts under the valve cover?

If not, there's the problem.

 

If so, you pull that lever when the kickstarter stops due to compression pressure and then push the kickstart lever down a couple of inches, let go of the decomp lever, bring the kickstart lever back to the top, and give it a normal kick.

 

Yes the decop lever is operating properly.

Even with the lever pulled, it was hard to cycle the motor.

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Any other suggestions?

I pulled out the plug and cycled the motor and it was really smooth and easy.

With the plug in, the compression stroke is super hard. My friend has a rmz250 and his is pretty east to kick compared to this bike.

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