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Old 07-23-2011, 04:18 PM   #1 (permalink)
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Honda fourtrax 300 carb

Hey I just bought a 94 honda fourtrax 300 2x4 and when I bought it I needed to rebuild the carb. It hardly ran at all when I bought it and the idle jumped from high to low and backfired and was just a mess. I took the carb apart and put a rebuild kit in it and replaced all the gaskets o rings jets etc and got it to idle nicely. It runs but when I punch the throttle it backfires untill I shift up into a higher gear. I tried tuning the carb but the only setting it will run on is with the pilot screw all the way in and the throttle adjuster loose. Any other settings it idles really high. I changed the fuel,spark plug, tryed running high octane and than ran a take or reg fuel in ti it all did the same thing. I checked the intake boot to see if it was sucking air but it isnt. It runs like this I can take it out ane everything but Ide just rather have it running correctly. Anyone know what the problem could be? Do you think its worth my while to just buy a new carb? Thank for the help.
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Old 07-23-2011, 04:39 PM   #2 (permalink)
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Welcome to the forums...Free downloadable manuals in the Schematics/Manual help section in the Technical discussions ...When you replaced the jets in the carb, did you put the exact same size,and brand back in ??? I think you may have a too small main jet problem if it only happens when you go to wide open throttle...
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Old 07-23-2011, 05:19 PM   #3 (permalink)
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carb's need to blow your carb out with air...every little hole..orface...if yer jets are all new..then it's your carb..make sure you read the sticky from me on how to clean and rebuild a explains everything you need to know on how to clean a carb..spec for a trx300.
'89 trx350D foreman 4x4...'85 vf700c magna, '83 cx650c , '03 trx450fm foreman 4x4 , 2015 Yamaha waverunner fx cruiser ho
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