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Old 12-01-2009, 08:40 PM
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" vapor lock" ......To me when you say this it means will not start and that usually happens after the engine is shut down . The fuel boils out of the line/carb and the engine is starved for fuel until it has be replace as a result of restarting the motor. Just trying to understand what you are trying to describe .

Next you say "cool down and it starts back up with no problem, runs like a scald rabbit"

"scald rabbit" ? driving it putting your foot in it, tri-power open ? that kind of scald rabbit ?

or are you saying it ideals smooth and is overall drivable ? if the later,
I would check the choke adjustment make sure it is open at operating temp.

How far of a cool down? cold ambient/room temp or just anywhere below 185 ..

I believe that tri-power would have progressive linkage, having trouble visualizing vacuum actuated outboard carbs.
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