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Old 12-03-2012, 02:14 PM   #1 (permalink)
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frequent high idle and stalls 1986 trx 350

hi all, i just rebuilt my 350 from the jug up. new rings fresh hone, rebuilt head, new gaskets and a carb rebuild also. having an issue with running, sometimes it runs great and others it will cut out and stall. when it does this i check spark which is fine. fuel seems to be getting there also. when it dies i try to restart it and it doesnt want to go. if i let it sit a while it will restart and run fine. then i will ride for a bit and after a while when i stop if i leave it in gear it will slow down til it stalls. if i catch it before it stalls hit neutral and feed it some throttle it will rev up and hold high idle. i try to kick it down by feathering but it will stay high idle. the only way it will kick down is to drop it in to gear which after it learches forward it calms right down. after i do that i can stick it back in neutral and it will idle fine, no problems. it only acts up if it stalls, or if i catch it before it does.
any ideas? thanks in advance -Johnny
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Old 12-04-2012, 12:30 AM   #2 (permalink)
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If you didn't remove,and clean the fuel tank,fuel pump,petcock,replace the fuel lines,or install an inline fuel filter then I would say that you have trash in the carb...
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Old 12-04-2012, 04:11 PM   #3 (permalink)
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thanks i will give that a try. i did a carb rebuild and there is an in line filter, it just seems like its either getting too much or not enough fuel. if i go full throttle from a dead stop it will die down, then come right back, if i get on it in stages "feathering" it will come right to life, but too much too fast and it sputters out. sprayed all around carb and no air leaks. i wonder if the bowl isn't filling up all the way? its not running out of the carb so i know its not overfilling. i don't know i can ride it and its ok, not great but ok. its a pain to start too. anybody else has any ideas it would be very helpful. youre probably right the carb is plugged or something. all that work for nothing.
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Old 12-04-2012, 06:09 PM   #4 (permalink)
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here is a weird thing to check , my 350 does this , at the throttle , bend the throttle cable see if the rpms go up or down , I found this issue when I was putting my handlebar mitts on , as I was tightening them up the engine started to race , and I was like wth man... then I loosened them off and the rpms went back down I tested this mystery by moving the throttle cable and the rpms went up and down accordingly, now I know why the engine races, well at least one reason anyhow ... for me it means a new throttle cable is in the future
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Old 12-04-2012, 06:42 PM   #5 (permalink)
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You're not getting enough fuel.
The carb bowl isn't filling up as fast as the engine is draining it, clean your carb and you should be good.
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Old 12-04-2012, 07:39 PM   #6 (permalink)
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Take your fuel line off and make sure gas is flowing freely. If it's just dribbling thru your petcock could need be clogged up.
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Old 12-04-2012, 07:44 PM   #7 (permalink)
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thats what i am thinking too, the float is not adjustable though. you can only replace it. poor design lol. i don't think its the cable but you never know, it seems internal like it acts when its out of gas and it revs higher. i am going to pull carb tomorrow and i have some carb dip i will soak it in and blow air through all the orifaces and see if i find any dirt or gunk. who knows. thanks again. any more ideas feel free to add i am willing to try anything once lol thanks -Johnny
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Old 12-04-2012, 08:04 PM   #8 (permalink)
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One other thing to check is make sure your gas cap is venting correctly. I had a '85 ATC 250sx with a plugged vent and I'd hop on it and ride for 30 seconds or so and it'd shut off on me because it was vapor locking. Next time it stalls on you, unscrew the cap and see if it's pressurized.
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Old 12-05-2012, 05:19 PM   #9 (permalink)
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Quote:
Originally Posted by Tippmann98 View Post
One other thing to check is make sure your gas cap is venting correctly. I had a '85 ATC 250sx with a plugged vent and I'd hop on it and ride for 30 seconds or so and it'd shut off on me because it was vapor locking. Next time it stalls on you, unscrew the cap and see if it's pressurized.
I had a 71 Skidoo Nordic did that, vent got ice built up in it (To many snowbanks) and pressurized the tank enough that it couldn't pump anymore.
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Old 12-05-2012, 06:22 PM   #10 (permalink)
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i checked the vent and it is open. i didn't get a chance to pull carb but before it rebuilt it it ran good, not great but good. i never had a problem before this. i only rebuilt carb for the fact i was doing everything else. wondering if i should put old internals back in carb and see what happens?
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