[shadetree]

my concern: have you checked the timing ???. the trx350 ranchers are prone to stretching the cam chains, and when this takes place ?, they don't run very well. another thing, the c.d.i, or the reg/rec, stator can cause your issue. but start by checking the timing, and valves for adjustment .

 

[shadetree]

my concern: have you checked the timing ???. the trx350 ranchers are prone to stretching the cam chains, and when this takes place ?, they don't run very well. another thing, the c.d.i, or the reg/rec, stator can cause your issue. but start by checking the timing, and valves for adjustment .

Cheers mate, I'll look into it, could be the timing chain possibly, seems kinda weird that it idles like new. Could this still be a valves issue?


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very well could be a valve issue ?. if the valves are not set right ?, you lose compression ?. in other words, if the intake or exhaust valve is not right ?, you may not be '' sucking in '' enough fuel to make the motor top out like you want.

 

[shadetree]

also, with it being a 2003 model ?, odd's are, the cam chain is stretched !..lol.

 

[shadetree]

Cheers mate, I'll look into it, could be the timing chain possibly, seems kinda weird that it idles like new. Could this still be a valves issue?





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very well could be a valve issue ?. if the valves are not set right ?, you lose compression ?. in other words, if the intake or exhaust valve is not right ?, you may not be '' sucking in '' enough fuel to make the motor top out like you want.

I've done a compression test and got 80psi without throttle open and 120psi with throttle open seems like enough pressure ?


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compression looks good, but if the timing is off ?, then the valves will be off.

 

[shadetree]

I'll tighten the chain and see what that does to the equation ?


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you can't tighten the cam chain bro !, it has an automatic cam chain tensioner built into the back side of the engine case. you have to remove the back engine cases in order to change the cam chain, which means, the starter has to come off, pull starter removed, stator case removed, flywheel removed, then you can replace the cam chain. you will need to drop the rear swing arm in order to get the rear engine case off. and you will need a flywheel puller tool to pop the flywheel off.

 

[shadetree]

also, YOU MUST PULL THE TOP END OFF AS WELL !. reason : the cam followers will drop down in the lower engine if you pull the cam out to replace the chain. you can how ever, unbolt the cam chain sprocket from the cam, and replace the cam chain that way ?, but I always pull the cam out, cuz I want to inspect the cam lobes. tip: the cam sprocket has punch marks stamped on it, they should have 250, and 350 stamped on it ?, YOU WANT THE 350 MARKS TIMED TO THE INDEX ON THE CASE, NOT THE 250 !..LOL.

 

[shadetree]

Hi all, just a general question, is there a specific wire to do with the CDI or something out that cuts the throttle control?



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no, c.d.i either works , or doesn't ?. has nothing to do with how the motor rev's, for the most part anyway. in other words, has no control over the carb.

 

[shadetree]

Hi all, just a general question, is there a specific wire to do with the CDI or something out that cuts the throttle control?







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no, c.d.i either works , or doesn't ?. has nothing to do with how the motor rev's, for the most part anyway. in other words, has no control over the carb.

Thanks for the confirmation mate


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your welcome. keep in mind, this info was for your model/year, newer atvs have a TPS on the carbs butter fly, which is tied to the ecu/c.d.i., yours does not have this .