i think its the carberator

Bikeguy Joe

Godfather of Motorized Bicycles
Jan 8, 2008
11,843
236
63
up north now
Check for an air leak at the manifold to cylinder area and make sure the fuel is flowing to the carb and that there is no crud in the carb.
 

misteright1_99

New Member
Mar 21, 2008
716
0
0
Treasure Coast, Florida
What kind of engine? Check fuel flow from tank to carb, HT engine maybe the strainer in the fuel valve inside the tank is plugged, from rust and junk inside tank. You have an inline fuel filter?
 

carlomarx1947

New Member
Jul 19, 2008
2
0
0
its a rotary:formula bike. i do have an in line fuel filter. it seems to be making it to the in line fuel filter
 

graucho

New Member
Feb 21, 2008
62
1
0
Minnesota
Possibly vapor lock and its starving for fuel. Loosen the cap for a test. Push the tickler button for 10 seconds. If thats it, drill a tiny tiny hole through the center of the cap. (needle size) Dont worry it wont spash out if its super tiny. This sounds similar to one of my experiences.