iv been working on a coleman ct200u mini bike with a honda gx420cc motor on it and a torque converter 1inch shaft 30 series
this project was one hard task no matter what direction i went with the build i was held up by obstacles from the gas tank not fitting and having to mount behind the seat
to the motor being so big the placement on the frame was problematic
i could use some help or input on how to get more top end speed with out building the motor any more
running a straight pipe exhaust with the aftermarket intake filter
i upsized my jet to a .043 but i bogg out when full throttling it
didn't have any bigger jets so i found a supper small drill bit and turned it into a .045 or .046 i believe not sure by drilling it out just a hair bigger
tomarrow i will be pulling the jet back off and drilling it out a little more then test riding
i was running a .042 jet and it would only get up to 20mph i then switch to .043 witch helped lot but after drilling it out is when i hit 43mph
i do believe changing the back sprocket would help but just dont no witch direction to go for a better top speed
THE PROBLEM
i can only reach 43mph over a longer distance of travel about 1/4 mile
i seem to pick up more speed when i gradually throttle almost like the torque converter needs time to catch up
PLEASE throw at me anny advise you can for jetting size or sprocket size
im looking to get atleast 60mph
i am running a 50 tooth sprocket on the rear with a 420 chain
stock gx420 carb
if i had to chance to redo the build id skip the POS torque converter they are trash unless you buy the real one
mounting the torque converter was very difficult the mounting holes dont line up and the torque converter hits the oil dip stick
not to mention i had to cut the bottom half of the torque converter off because of it hitting the frame
this project was one hard task no matter what direction i went with the build i was held up by obstacles from the gas tank not fitting and having to mount behind the seat
to the motor being so big the placement on the frame was problematic
i could use some help or input on how to get more top end speed with out building the motor any more
running a straight pipe exhaust with the aftermarket intake filter
i upsized my jet to a .043 but i bogg out when full throttling it
didn't have any bigger jets so i found a supper small drill bit and turned it into a .045 or .046 i believe not sure by drilling it out just a hair bigger
tomarrow i will be pulling the jet back off and drilling it out a little more then test riding
i was running a .042 jet and it would only get up to 20mph i then switch to .043 witch helped lot but after drilling it out is when i hit 43mph
i do believe changing the back sprocket would help but just dont no witch direction to go for a better top speed
THE PROBLEM
i can only reach 43mph over a longer distance of travel about 1/4 mile
i seem to pick up more speed when i gradually throttle almost like the torque converter needs time to catch up
PLEASE throw at me anny advise you can for jetting size or sprocket size
im looking to get atleast 60mph
i am running a 50 tooth sprocket on the rear with a 420 chain
stock gx420 carb
if i had to chance to redo the build id skip the POS torque converter they are trash unless you buy the real one
mounting the torque converter was very difficult the mounting holes dont line up and the torque converter hits the oil dip stick
not to mention i had to cut the bottom half of the torque converter off because of it hitting the frame