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Old 09-30-2010, 07:40 PM
msrfan msrfan is offline
Motorized Bicycle Elite Member
Join Date: Sep 2010
Location: Southern California
Posts: 1,484
Default No more vibrations (almost)

I was plagued by vibrations a few weeks ago with 2 bgf motors in a70's-80'scruiser. A third bgf went into a Panama Jack and it's livable (photos forthcoming). So, I was on the verge of sending the crank away to be balanced. After studying the formulas on line and visiting a friend with an automotive machine shop, I concluded that I could do the job myself. I really didn't want to split the crank so I used the same formula but utilized the conrod as part of the bobweight. Now the motor revs high and vibrate's little at max rpms. Very rideable. I had to take off considerable weight at the rod pin. Also I didn't have to use the head or muffler brace. I want to thank all who responded to my first thread with some great suggestions.
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