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-   -   trx350 4x4 hard to start when hot (http://www.hondaatvforums.net/forums/honda-fourtrax/5667-trx350-4x4-hard-start-when-hot.html)

200xranger 08-24-2010 07:48 PM

trx350 4x4 hard to start when hot
 
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.

Pain 08-25-2010 07:09 AM

Someone who knows the mechanical stuff should be along to help you more, but in the mean time, take a garden hose and carefully spray some of the electrical parts, like the coil, and CDI, to cool them off.

From what you said it doesn't sound like a fuel problem, and that leaves electrical in my opinion.

shadetree 08-25-2010 07:44 AM

Quote:

Originally Posted by 200xranger (Post 62394)
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.

welcome to the forums..first off..these machines are designed to shut down when they get too hot..if the fan doesn't come on..the fan control sensor tells the c.d.i to shut if off..to keep the motor from seizing..it's a saftey feature they put into these bikes..put your carb jets back like they were ( stock )..and check the oil temp sensor..your fan control sensor..and the fan itself..if anyone of these is not working..your bike won't run...well..it will run.it just wont run long..not until you get the oil to cool from the oil cooler...which gets cooled by the fan...you really have to get these bikes hot..and not just by idleing..start with your oil temp sensor..bottom right..near the foot peg..behind a metal cover..more than likely...you will have to remove it to test it..do you have a service manaul for this bike ?..if not..you will need one..the pic in my post..is a 89 trx350d foreman i restored..i've owned two of these..one was a 87..i'm pretty smart on them..lol.

200xranger 08-25-2010 11:37 AM

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.

Helmut 08-25-2010 12:10 PM

Welcome to the forums.

200xranger 08-25-2010 05:29 PM

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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