Won't start when hot!

i-paint · Apr 5, 2009

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 · Apr 5, 2009

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 · Apr 5, 2009

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

Larry

Bikeguy Joe · Apr 5, 2009

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 · Apr 5, 2009

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

2door · Apr 6, 2009

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

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Won't start when hot!

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Bikeguy Joe

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