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Old 12-25-2008, 06:03 PM
Airbuzz Airbuzz is offline
Motorized Bicycle Member
Join Date: Aug 2008
Posts: 49
Default Re: Topping out at 20 mph...Too much fuel ?

Looks like I solved the problem, and of course thank you for all of your suggestions which were indispensable in helping me figure this out.

The carb was simply flooding the motor. The solution was to bend the arms of the needle valve assembly in the downward direction. I bent the arms down a significant amount. It was a bit of trial and error, allowing the arms to drop down and watching when fuel would release. I test ran the bike a few times with the float bowl re-installed, finally getting it to run well. It does 30 mph + without hesitation. See the first and second pics. Also of note is that the bike has probably been running very rich from the get-go. After every run, an oily fuel would build up in the muffler. Then it would leak out on the floor. This was probably un-burnt fuel that had been washing the cylinder wall down. Bad for wear!

All gone now! And thanks again ! Merry Christmas.

Jasonh thanks about your concern for my Boy. I'm watching him.

Also, see my next build, Pic #3. It'll be black, antique white, and orange. The frame is a little stretched.
Attached Images
File Type: jpg IMG_3198.JPG (177.0 KB, 92 views)
File Type: jpg IMG_3220.JPG (165.9 KB, 79 views)
File Type: jpg carby float schematic resized rev B.JPG (37.9 KB, 93 views)
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