gas leaking out of overflow.

[scottyskidoo]

So just put togeather my first build. A gt5 on an onyx frame I was actually able to tune the troubled cns v3 carb and i have it running pretty damn good. But alas another problem ive had to turn the air mix screw all the way out, save for a half turn any more in than that and it fourstrokes through the power band. Ive got gas coming out of the overflow tube at WOT. Im asuming that if i go down a jet size it would solve my problem. Im a noob to the engine but not to mechanics for the most part. Just want to check my theory. Thanks. Or possibly i need to make a float adjustment?

 

[Al.Fisherman]

So just put togeather my first build. A gt5 on an onyx frame I was actually able to tune the troubled cns v3 carb and i have it running pretty damn good. But alas another problem ive had to turn the air mix screw all the way out, save for a half turn any more in than that and it fourstrokes through the power band. Ive got gas coming out of the overflow tube at WOT. Im asuming that if i go down a jet size it would solve my problem. Im a noob to the engine but not to mechanics for the most part. Just want to check my theory. Thanks. Or possibly i need to make a float adjustment?

I'd first start with the float adjustment. You never mentioned which carburetor you have. Usually the GT5 (ones that I have seen) comes with a NT speed carburetor, and there is no fuel adjustment, just a idle screw.
http://www.gasbike.net/grubee_skyhawk_gt5_66cc_80cc_slant_head_standard_finish_bike_motor_kit.html#

 

[scottyskidoo]

I'd first start with the float adjustment. You never mentioned which carburetor you have.

My bad its the cns v3 the new one.

 

[Al.Fisherman]

My bad its the cns v3 the new one.

If you don't have much experience with carburetors, I'd get rid of the CNS and go with the NT speed. These CNS carburetors can give you headaches. I'm sure some one will buy it off of you or trade. my $0.02

 

[scottyskidoo]

My bad its the cns v3 the new one.

Yeah the new 2011 kits come with the new carb its got an air mix screw but its covered with a brass cap so you cant make adjustments for the epa. Without taking it off its impossible to tune.

 

[Nashville Kat]

Are you certain it's the overflow? I've had a couple of main lines crack and it's hard to tell where it's coming from.

Don't those tubes on a CNS come out and reattach at another point??
- dunno- never had one.

 

[scottyskidoo]

yeah its the overflow iv'e got a really short tube on it. comes right out from underneath the float bowl.

 

[MotorBicycleRacing]

yeah its the overflow iv'e got a really short tube on it. comes right out from underneath the float bowl.

Carb over flowing means the float is set too high or there is
some junk under the float needle valve.

did you take the bowl off and clean / inspect the float needle valve?

 

[scottyskidoo]

not yet, So when adjusting the float i bend the center tab slightly so it sits lower in the bowl correct?

 

[Al.Fisherman]

not yet, So when adjusting the float i bend the center tab slightly so it sits lower in the bowl correct?

Correct...while apart check the inlet needle and seat for trash.