sound like what im having trouble with , it seems fine when cold , when warm , you sit on it and then wont go
#
rumblin may be your rollers,
try this first , new spark plug
then if it doesnt work try adjusting your mixture screw , taking note of its initial position (it is know for them to rattle loose )
then try, taking out your filter sponge and but the empty case back on ? does it go now , if so , its air/fuel management #
ive not cured my own problem yet , but i have heard of people taking off the choke and blanking the hole over
if your carb is water fed, might be an idea to take to pipes of and connect them together this way the carb thinks the engine is cold > does this work im not sure , but anythings possible
post if you find an answer
jase
April 2008