Too much carb?

[Johnny_]

Please see my link for photos. Piston port induction. My procedure for new carb install. Caution to gently bottom needles to prevent damage. L 1.0 / H 1.5 turns out. Start engine with full choke. Choke off. Keep bike running & turn idle stop up. Turn L needle in until RPMs rise & back out a 1/4 turn which should establish a decent cold idle in combination with idle stop adjustments. Warm bike up and fine tune L circuit / idle speed. Engine should 4 stroke heavily at higher RPM so turn H needle in until 4-stroking just stops. Just installed a 21mm pumper carb that has better low-end response and similar top end vs the 25 mm 090. External fuel pump works if you don't want to integrate impulse port into intake manifold. Carb will operate on gravity fed fuel, but not to its full potential. Provides a very smooth power band and metering diaphragm design appears to allow carb to work on smaller displacement engines that intended.Good luck


View: https://www.reddit.com/r/motorizedbicycles/comments/1hny6oq/comment/mep3r3m/?context=3

Thanks! I'll try it again.

 

[Johnny_]

Sooooo anther thing I'm thinking, is I have a 1/8 fuel line for the pulse line, is it possible that's too small?

 

[CaveManMechanic]

Sooooo anther thing I'm thinking, is I have a 1/8 fuel line for the pulse line, is it possible that's too small?

1/8" impulse line is okay. Assuming you drilled your flange to install impulse port, be sure your flange port aligns properly with the carb flange port and the gasket doesn't block passage. Keep in mind the carb will run on gravity fed fuel without a pump but the carb metering diagram will not function as designed. Good luck and let us know how it goes please.

 

[Johnny_]

1/8" impulse line is okay. Assuming you drilled your flange to install impulse port, be sure your flange port aligns properly with the carb flange port and the gasket doesn't block passage. Keep in mind the carb will run on gravity fed fuel without a pump but the carb metering diagram will not function as designed. Good luck and let us know how it goes please.

I will do that. Thanks!