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View Full Version : 440 Kit Carb?



BrooKLyN400EX
11-10-2003, 09:36 AM
I bought the midrange kit from ct racin which is the 11:1 440 kit, a stage II webcam, headwork, exhaust and other little stuff. The guy at ct racing, Allen Knowles, said not to buy the 41 FCR carb with my kit. He said the jetting actually gave mine better dyno numbers...so i put the engine back together and then put a 170 jet in..i messed around with the other jets and the 170 "works the best." The piston rings are already set now and i've ridden the new engine at jack frost and chadsworth at least 7 times. The low end is non existent...if im in the trails in 1st gear running at 6000 rpm and shift the engine will bog out and eventually stall...on the track it whips unbelievably but i will do a hill climb pinned in 2nd gear revving high (8700 rpm) and it will bog out...it almost stalled on a big hill, and i downshifted and it still bogged in first!!!!Should i go with the 38 or 39 fcr carbs???What should i do? Im a mechanic and i cant figure this out...i messed with the screw, the needle...what should i do nothing works...help me!!!!

YZROOSTINYA
11-10-2003, 10:57 AM
i am at a 155 main and my jetting is perfect, you sound WAY rich



a 39 fcr

BrooKLyN400EX
11-11-2003, 06:03 PM
yea but my bike has bigger valves and the head is done and the cam is alil wilder so i need more fuel its not runnin too rich

hondafox440
11-11-2003, 07:26 PM
How do you know it isn't too rich? Bogging is a sign of rich jetting, and bogging on the top end is caused by the main jet.

norcalatver
11-11-2003, 07:33 PM
Sounds way rich to me too. I am running FDO's 493 stroker which is completely wild and am only running a 162 main jet. This jetting came from the dyno which has a sniffer on it. Even with a 162 I am a little rich.

airheadedduner
11-11-2003, 10:20 PM
Rich or not a 39fcr would definatly wake up your motor.

Colby@C&DRacing
11-12-2003, 11:07 AM
I would run the bigger carb. I have yet to build a motor and have it run better with the stock carb. go withthe 39mm FCR :)