81-82 GPz , J, LTD, CSR series Frame Bracing ?????

There is a significant chance that your wobble could be caused by the fairing.
Back when Lawson raced his and the factory came out with the 1/4 fairing the objective was to give the racers something to tuck in behind and improve the air-flow around the rider. The discovery was that the air pressure along with the air turbulence caused varying pressures to the steering (through the fairing which was mounted to the triples)...which caused designers to gravitate towards the frame-mounted fairings. Lawson, Rainey and the rest took the fairings off their race bikes and installed number-plates where the fairing would be (often - not always - in front of oil coolers, mounted to the frame). Today such problems are aleviated by technological advances in frames, suspension, and tires (so ZRXs can maintain "the" look w/o negative side effects).

Consider the Japanese race series where the old-school superbikes such as the Z1Rs and the Wes Cooley's race. These motors are highly modified big-bores that crank out well in excess of 150bHp (well in excess) and they are always in braced frames, modified (beefed up) suspensions, and the fairings are mounted to the frames.

There have been several articles on it; 'Motorcycle Classic' or 'Classic Motorcycle' or some vintage-type of magazine had a big write up on it a few years back. I'm not at home at the moment to dig it out, but the racers all took the (fork mounted) fairings off b/c of what they did to the handling at higher speeds.
...just a thought.

-KR

That is a very good point about the fairings. I will have to study that a bit more. I will obviously not remove the fairing, so I will have to see what could be happening.

Get a chance read all of puppets theorys on chassis design and you may find some answers pertaining to chassis bracing and design. I know it's about drag chassis taken to the extreme but a lot can be used in little doses.

otakar wrote:

That is a very good point about the fairings. I will have to study that a bit more. I will obviously not remove the fairing, so I will have to see what could be happening.

I was thinking that a steering damper might solve your problem; this way you can keep the fairing...and YEAH, don't get rid of that fairing, your bike is too good lookin' to go messing with looks that you have spent that sort of time in perfecting.

-KR

I will also be putting a 18" front wheel on it this spring. That will change things a little bit for the worst. At the same time I will be putting in the stiffer springs, and might even insert in a small spacer for even a bit more stiffness. I have had a right fork oil leek also. I will have to change that seal again for the second time in two years. See if that helps at all.

Well, yeah, traditionally the 19" offers a lot of stability, but you can never tell. What I was thinking was what if you go to an 18" on your rear, also? Then you'll be looking at 18" front and rear. There won't be a LOT of rear ride height difference as the 16" use a real tall profile. It's another weird thing that I read years back (I have no idea where) but it was something about same diameter wheels and some gyroscopic effect thing. Sorry, I can't give you some 'official' source to go reference.
I've gone that route on an older KZ and it worked out really nicely...the bike is gone now, but it was good. The earlier KZ frames are different than J/GPz eras but still the concept is the same. I would think that a J or GPz rear wheel would likely bolt right up.

Again, just my .02-of-a-dollar...I'm a big fan of what you have done to your bike. Great stuff!

-KR

The problem I would have, if I went to a 18" rear is that I would not be able to make it stick. I am now getting just what I require with the wider 16" rim. With the 18" front instead of the 19" which is on there now I will be a bit closer. When I am ready to replace the rear tire I will go with one which is a bit bigger. I still have room next to the chain. I believe that the problem stems from my forks.

I wonder if its posible that the wobble is related to the fork leak?? could 1 fork be softer than the other???:blink:

That is very possible. I do not trust air forks and that is this case.

PLUMMEN wrote:

trianglelaguna wrote:

heres one with some rake changes:woohoo:

looks like he put the intercooler for supercharger right behind theheader,kinda counter productive im thinking. im sure it hauls ass but that style bike dont look right with raked frontend to me,looks more like a honda cruiser! :laugh:

looks like the same rake as a V-Rod