M
macarollo
Guest
I have a 70cc HT kit. When I am running full throttle (vibration is pretty bad) every now and then the engine will surge... like it isn't getting fuel for a second, then it picks back up.
under 3/4 throttle everything is fine.
When I give it full throttle on level ground I notice that the fuel line is vibrating like crazy and I see air bubbles forming at the top of the line AND at the bottom of the line... eventually the whole line is filled with air bubbles, then it surges... if I let off the air bubbles clear and I can run full throttle until the line fills with air bubbles.
One thing that seemed strange to me is that I see some air bubbles come up from the carb under WOT. Is this normal? Is there a leak in the carb?
I have tried to tighten the fuel line, petcock, carb-manifold bracket, but it still surges once it is filled with air bubbles. It didn't used to do this.
Any ideas for me?
under 3/4 throttle everything is fine.
When I give it full throttle on level ground I notice that the fuel line is vibrating like crazy and I see air bubbles forming at the top of the line AND at the bottom of the line... eventually the whole line is filled with air bubbles, then it surges... if I let off the air bubbles clear and I can run full throttle until the line fills with air bubbles.
One thing that seemed strange to me is that I see some air bubbles come up from the carb under WOT. Is this normal? Is there a leak in the carb?
I have tried to tighten the fuel line, petcock, carb-manifold bracket, but it still surges once it is filled with air bubbles. It didn't used to do this.
Any ideas for me?