I've heard about others having vibration at various speeds. I didn't have this problem. I started with a standard GEBE setup and then modified it somewhat by cutting the mounting forks and building parts to hold them to the frame instead of bolting them to the axil. I also extended the engine back further with a longer metal bracket.
I never had vibration to speak of.
Until...
...my rear tail light broke off. It was mounted to a small bracket bolted to the clutch housing and eventually the vibration of the engine fractured the metal bracket and it went bye-bye.
No vibration yet... stay with me...
So I got another tail light and bolted it onto the extended motor mounting bracket. (See Pics) Bingo... I had vibration. During accelleration through mid-speeds, my seat and bike would vibrate excessivly. It would go away when the engine reached it's upper RPMs.
****dest thing!
I haven't made the connection yet. It couldn't really be the light placement... could it?
I made plans to remove the light and try the bike out. I did it yesterday on the way home from work. With the light removed, the vibration went away.
I put the light back on this morning (I ride to work in the dark... no way I ride without that light). The vibration came back but it was not as bad. The light is mounted with a bracket that has an oblong hole. I can position the bracket forward or backward by about half an inch. That half an inch makes a difference.
Soooooo... ponder the evidence folks. I conclude that small changes can make a BIG difference in vibration. If you are having trouble with excessive vibratioin try moving things a bit. Maybe add a bolt to your engine mount and see what it does. I would suggest that vibration is likely exaggerated the most in large flat or long parts such as the long flat engine mount above between the seat and engine. Making small changes to this may eliminate your vibration entirely!
Happy motoring!
Ross
I never had vibration to speak of.
Until...
...my rear tail light broke off. It was mounted to a small bracket bolted to the clutch housing and eventually the vibration of the engine fractured the metal bracket and it went bye-bye.
No vibration yet... stay with me...
So I got another tail light and bolted it onto the extended motor mounting bracket. (See Pics) Bingo... I had vibration. During accelleration through mid-speeds, my seat and bike would vibrate excessivly. It would go away when the engine reached it's upper RPMs.
****dest thing!
I haven't made the connection yet. It couldn't really be the light placement... could it?
I made plans to remove the light and try the bike out. I did it yesterday on the way home from work. With the light removed, the vibration went away.
I put the light back on this morning (I ride to work in the dark... no way I ride without that light). The vibration came back but it was not as bad. The light is mounted with a bracket that has an oblong hole. I can position the bracket forward or backward by about half an inch. That half an inch makes a difference.
Soooooo... ponder the evidence folks. I conclude that small changes can make a BIG difference in vibration. If you are having trouble with excessive vibratioin try moving things a bit. Maybe add a bolt to your engine mount and see what it does. I would suggest that vibration is likely exaggerated the most in large flat or long parts such as the long flat engine mount above between the seat and engine. Making small changes to this may eliminate your vibration entirely!
Happy motoring!
Ross
