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This is the photo I saw from Chris's website.

Hi 307 startup,

Thanks for your reply and advice. The current heatsink is 1.5" diameter and you are right, the main restiction is the location of the carburetor which allows about 0.25" increase...

Hi All,

here is the story. many radio controlled lite machines helicopter (1/2A heli) fans like myself have been trying hard to find a good replacement engine for the what seems to be the world's...