i have a 83 250r air ccoled.i just put in a new piston after it has been sitting for 6 years.i cranked it up and it ran for about 15-20min and died.i have good spark but noticed that the spark plug is dry .i cleaned the carb twice and still have a dry plug.has anyone had this problem?can anyone help?

 

clogged pickup in the tank? clogged petcock? take the fuel line off the carb and turn petcock on to see if getting fuel to carb, the look at clogged jets, etc in the carb or sticking choke, needle valve etc. i had some junk stuck in the pickup tube that restricted fuel flow. cheers!

edit: check carb float level too- i put the float back in wrong after cleaning and no gas...

 

update i put in anew plug and had to push start. runs good but after its shut off and left for over 2min it has to be pushed again. this morning i rechecked everything on the tank and carb.?????

 

How long does it run for til it dies? Check the vent hose on the gas cap, don't laugh if it pulled it won't run for long.

 

UPDATE#2 I CALLED MY local honda dealer and got the right rotio for gas mix (32:1).went out 4 test run and muffler fell off.now its like new. starts on the first kick (clogged exhaust pipe)i guess it pays not to tighten bolt on a test run after repair