Won't start when hot!

i-paint · #1 (**permalink**) 04-05-2009, 04:43 PM

I have a Dax F80 engine with 235 miles. I have a rope pull start and a SBP shifter kit.. The carburetor is a Dellorto SHA. It starts, runs and idles fine when it is cold. After running for a while and it is warmed up, if it dies or I shut it off, it won't start with the rope pull. I can use the pedals (probably spins the engine faster) and it starts right up. I need some help, any ideas?

Thanks, Larry

MB-Monkey · #2 (**permalink**) 04-05-2009, 05:06 PM

pull starts on the small 2 stroke is known to not spin the motor fast enough. you could replace the return mech and rope and see if that helps but that cost you could prob get a new pull start.

i-paint · #3 (**permalink**) 04-05-2009, 06:05 PM

I can't figure why it starts fine with the rope when it is cold and not when it is hot.

Larry

**Bikeguy Joe** · #4 (**permalink**) 04-05-2009, 08:47 PM

Try using just a little choke, even when the engine is warm.

I found that even in the summer, if I shut the bikes off for more than a few minutes, they always started better with a touch of the primer, or a little choke.

MB-Monkey · #5 (**permalink**) 04-05-2009, 09:05 PM

a cold motor is going to have more compression once the motor and parts are hot plenty of places to loose compression

**2door** · #6 (**permalink**) 04-06-2009, 10:48 PM

I have to agree with Joe. I've found my engines always respond better with a little choke on starts, cold or hot. One cause of hard hot starts can be fuel atomization in the carb and intake. The fuel vapor actually evaporates into a very lean mixture which a little choke, (reduced air) can remedy. Good luck.
Tom