Post Master General
Join Date: Apr 2012
Location: Bowling Green, VA
I Ride: '09 ZX6R
When you get far enough through this process to start trying to sort out the rear suspension, you may find that is more difficult than you expected.
This is almost certainly going to be due to the shaft drive system Honda used on that bike. I owned a 1985 VF1100S and rode it through 52K miles, and the suspension was the weakest link on that bike, IMHO.
Due to the power of my bike, the drive shaft would try and 'crawl' up the pinion gear in the rear hub. That would cause the housing of the shaft to be torqued 'up', which extended the rear suspension. This was primarily due to the relatively short shaft housing used on my VF1100S -- it also occurred on the Magna, and most of the Shadows in that time frame as well.
The solution has been to use a longer wheel base, which reduces the leverage available, and to only apply shaft systems on bikes with relatively low power.
BMW, and Motoguzzi both went another way, to get around this.... the paralever rear suspension system adds another U joint at the rear hub, and cuts the shaft housing off of the hub. the hub is then given another brace back to the frame to absorb the torque, rather than feeding it into the suspension.
The potential fixes are limited, without redesigning the hub and drive system -- about all you can do is make the rear suspension stiffer, which will make the ride harder.....
"Basic stuff fellas. Use your head for something other than to break your next fall."
"There's this adage that we have 2 ears and one mouth so we should listen twice as much as we talk. Unfortunately with the Internet people have taken this old adage and turned it around. They have two eyes and 10 fingers so they think they need to post 5 times as much as they read. And since they have 10 fingers and one brain, they only have to think 10% of the time! "