Bouncing at 40 mph with 16T sprocket, solved

[Easy Rider]

Originally Posted by Gadzooks Mike

Since we're into pulsing bikes, has anyone noticed that at a certain RPM, the bike actually almost bounces up and down? It's like riding a trotting horse. I'm guessing that it's sypmathetic vibration caused by the single-cylinder engine that just builds up. I can hit it pretty consistantly at around 40mph in 4th gear with the 16T sprocket. All I have to do is back off the throttle or go up just a hair and it goes away.

Couldn't remember where this was posted; finally found it!

Don't know for sure what causes it, probably a combination of the counter-balanced single and the suspension design and maybe even the spacing of the pavement cracks.
It sure is a wierd sensation though!

At any rate, I'm pretty sure I eliminated it by upping the rear shock pre-load(s) by one notch. Had it on the lowest setting to start with. Haven't noticed the bronko bucking now for the past 5 rides.