A lot of Vibration at medium throttle.

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Jul 3, 2008
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Philadelphia, PA
I just built a new motorized bicycle using a black slant head. Sofar everything is mounted up nice and snug, and aligned. However out of curiosity I wanted to go full throttle on my new engine after about 1 tank of gas at 20:1 Ratio of Honda GN2 2 stroke oil. Speed and pickup is great but there is a lot of vibration around half throttle but it then dies away at full throttle. I thought that maybe the aluminum frame is the culprit, but I would like a second opinion...
 
Mine does it at about 5mph and goes away when I speed up. I think we both have gremlins!:D

Terry
 
You are probably in a resonate frequency. All mechanical stuff vibrates at frequencys. It could well be the frame being excited at that engine rpm. Try tieing it down better.
 
My new build

Here is a picture of my new built. I hope I resized it correctly. Tell me what you guys think. = )
 

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