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Old 05-23-2011, 12:51 PM   #1 (permalink)
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Unhappy bogging down at high speed help!!

my honda forman trx 400 bogs down only at high speeds in 3rd and 4th gear when giving full throttle.i have done everything i can it just wont quit.i have replaced the cdi the coil i put a brand new carb on it redid the top end thinking it was vavle or compression issues i even removed the auto decompressor on the cam shaft the atv only has 600 hrs on it i have done everything fuel related possable its still the same its not a gas problem the thing starts and charges fine may this be a stator triger problem? please help!!!!
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Old 05-23-2011, 02:06 PM   #2 (permalink)
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Welcome to the forums....Check your airbox for a restriction of some sort..Is this is a Foreman,or an ex??
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Old 05-23-2011, 02:19 PM   #3 (permalink)
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Just to verify, is it at high speeds? or high RPMs?

Big difference between the two. If it is RPM based, gear shouldn't matter when referring to stator pick up.

You say you did everything fuel related. Jets (main and pilot)?

Main jet is your top end. Did you try big and smaller?

Might be lean or rich up high, both could have the same effect.

No blockage in fuel line?
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Old 05-23-2011, 02:22 PM   #4 (permalink)
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It sounds like your main jet is too large, did you have a mod on it and remove it or the previous owner have something done to it? I would pop the airbox lid off and try driving wide open and see if you still experience the same problem, if you don’t your running to rich.
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Old 05-23-2011, 02:33 PM   #5 (permalink)
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this is only high speeds and not rpm.it will not do this in 1st and 2ed gear under high speed or rpm.but if you try to pull something or put it under load in 3rd or 4th even without a load it just bogs down and starts making a spraying sound out the tailpipe what is this? the jets have been played with the fuel air mix makes no change have messed with it for three weeks and replaced everything on it there are no cloged filters lines airbox is fine even looked at the muffler i just dont know? it only has 600hrs and never been abused the motor is like new you can eat off it
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Old 05-23-2011, 02:38 PM   #6 (permalink)
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just to note i bought this brand new from the dealer years ago no mods all stock no after market carb jeting there should be no need it ran just fine untill now and like i said i bought a brand new stock carb i just want it to run
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Old 05-23-2011, 02:51 PM   #7 (permalink)
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also i did a ohm test on the stator pickup it is .353 ohm cold the book says max is .360 it goes up to 480 somtimes higher when hot may this be my prob?
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