Honda foreman 400 bogs down at high speed - Motorcycles

Spray carb cleaner staight into carb opening at fast idle

It could be your idle speed is set too low. If it will run with the throttle slightly open and rides okay with the revs kept up I would try increasing the tickover speed and go from there.

sounds like it's time to rebuild the carbs you cantry running some sea foam cleaner thru the gas but you will prob. have to do the carbs

speed sensor maybe

Hopefully the fuel filter. If you floor it and it has a delay or it won't reach high RPMs it's most likely the cause.

hello
it seems that the control motor may be sticking to lock, and/or the angle sensor is bad or causeing this. something to check is the control motor shaft lock. on the left side of the atv there is an electric motor that is bolted to the front crankcase. take the two bolts that hold it on, off. and remove the motor. take a short screwdriver, and you should be able to turn this shaft freely either way. if you cannot nudge it a little the one way it may be stuck and see if this frees it up. if this was stuck and gets freed up. this may just be a temporary lock, but if it continues the angle sensor may need to be replaced.
if the motor shaft was not locked up then the angle sensor may still be to blame. thank you.

first unplug the connector for the startor. then check for power AC on all 3 wires, it has to be the same at 4000 or 5000 rpm. some 50 or 60 volts AC. if this is ok then plug it back and check the power DC in the batt. if it is 12.70 dc volts or under when the revs go high then it is the regulator.