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trx350 4x4 hard to start when hot

8098 Views 5 Replies 4 Participants Last post by  200xranger
new to the board. just got a 87 350 4x4. rebuilt top end. will start when cold but i rode it for 20 minutes and it wouldnt idle and died. would not start back up until it cooled down. fuel pump pumps. carb clean. stepped up on the pilot jet from stock 35 to a 38 then 52 when 38 didnt help. my idle screw is all the way in on the carb and i have to use the cable to adjust idle. when i warm it up the idle slowly falls then dies!!! when trying to start when warm if i give a little gas it wants to fire if i hold wot it wont even try to start. any ideas? sorry so long just want to give all info possible, im usually good diagnosing problems but this has got the best of me.
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the fan has not kicked on yet. saturday was the first time i really got to ride it since i bought and rebuilt it. the bike has a cobra exhaust so i figured stepping up on the jets was appropriate. i do have the manual for it so i will check the oil temp sensor. however even when cold it takes more cranks than i like to start thats what made me believe it was a fuel problem. plus when it is idling if i hit the gas, it will die like the pilot jet can keep it running. the main jet has been bumped up. was that way when i got it i guess to compensate for the pipe.
easiest way to check these? not to good with wiring. i have a meter but i lost the book. any other ideas? i have read that it could be the coil, when it gets hot it doesnt produce spark? the only problem i have is i have to drive over an hour and half to ride and it gets aggravating going out to only ride for 20 minutes.
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