TOPIC:

Mark I do appreciate the feedback, but I think I am going to leave the rear tire where God and Momma Kawi intended it. Honestly, this is the debate that has raged on for years at the ZRXOA site about he handling benefits of the ZRX1100 vs. ZRX1200R due to the offset present in the 1200's rear swing/wheel placement while the 1100's is centered with the front wheel. Am I going to race this bike, probable not. Am I going to go bombing around on it, absolutely. I will have a 1/2" offset front sprocket made up and then mill the rear accordingly which based onthe measurements I have taken, should locate the chain nicely in the middle between the tire and frame.

I say this, but who the heck knows what I may decide tomorrow. It is bike-ADD.

Cory

Just saw this thread, I'm luvin it!

NakedFun wrote: Mark I do appreciate the feedback, but I think I am going to leave the rear tire where God and Momma Kawi intended it. Honestly, this is the debate that has raged on for years at the ZRXOA site about he handling benefits of the ZRX1100 vs. ZRX1200R due to the offset present in the 1200's rear swing/wheel placement while the 1100's is centered with the front wheel. Am I going to race this bike, probable not. Am I going to go bombing around on it, absolutely. I will have a 1/2" offset front sprocket made up and then mill the rear accordingly which based onthe measurements I have taken, should locate the chain nicely in the middle between the tire and frame.

I say this, but who the heck knows what I may decide tomorrow. It is bike-ADD.

Cory

that is interesting. i never knew that.
i started off to set the rear wheel to get it to line up with the front wheel. then i had to tweek things to match the sprocket lines.
in the end i realy dont think it makes any dif , unless u r a top notch racer.
i have taken it to the track (road racing) and could not tell that its not perfectly centered. after u start shitting your pants, when the motor, or pipe hit the ground, u dont pay much atension to the small stuff.

NakedFun wrote:

I love that fender!! What is it off?

Same thing as the forks, a ZRX! Just with a satin black rattle can treatment by the PO.

Cory

Cory,
Thank you for the forks measurement, it is just 1/2 inch shorter than the original (and softer) forks. This thread has quite a lot of very good information and thought process in it, especially the discussions you mentioned about front/rear wheel alignment for the chain clearancing, many thanks. I would go with the 6 pot calipers, more braking surface for such a heavy bike and rider, I weigh 265 myself and will probably get a set for my bike. Front fender looks great as does the paint scheme.

Great project!

ALec

Looking for opinions. New measurements show about .358" between the outside of the chain and the widest part of the tire with the 3/8" sprocket. Now the chain at it .99 degree angle is angled toward the tire...so that should improve slightly with the 1/2" offset Leon is making me. So with the sprocket at 1/2" that puts the chain with .092" clearance to the frame with that extra .125" offset. So if I were to take another .125" - .200" off the hub, that would increase my frame clearance slightly and leave me with approximately.158" of clearance at the tire. This would still leave me with the sprockets out of alignment by .140" over 27.3" chain span. This equates to .3 degrees deflection. Is this OK? If I took that much more out of the hub for a total of .340" that theoretically would only leave me .018" to the tire which seems close. The other option would be to go out to 5/8" front, which means frame interference for sure, but then drop what I need to mill extra out of the hub to .215" from .200". Thoughts?

Cory

I'm in the same boat as Streetfighter KZ.
I run a 5/8" offset sprocket and it to has only removed the paint on the frame.
It does run within 2mm of the tyre and frame. Also without a bearing support.
The motor is a 1327 and has been dynoed at over 125 HP.
The only problem I had was the spline on the sprocket was about 14mm and there is
only 8mm on the output shaft. This resulted in stripping the spline on both the
sprocket and output shaft. Also this increased the offset.
I have replaced both with the same sized sprocket and used a longer output shaft,
Which I was told came out of a 79' model.
The only difference is the spline is 14mm long.

Sprocket alignment.
Counter-shaft and final sprockets should both be in the exact same geometric plane, without any deflection whatever in chain travel between the sprockets.




Wheel alignment.
While both tires should be rolling in the exact same direction, their center-line road contact patches need not overlap.



Good Fortune!

Harvey1327 wrote: I'm in the same boat as Streetfighter KZ.
I run a 5/8" offset sprocket and it to has only removed the paint on the frame.
It does run within 2mm of the tyre and frame. Also without a bearing support.
The motor is a 1327 and has been dynoed at over 125 HP.
The only problem I had was the spline on the sprocket was about 14mm and there is
only 8mm on the output shaft. This resulted in stripping the spline on both the
sprocket and output shaft. Also this increased the offset.
I have replaced both with the same sized sprocket and used a longer output shaft,
Which I was told came out of a 79' model.
The only difference is the spline is 14mm long.

i have a D&G 630 5/8" offset sprocket in my hand. it is 12.8mm thick at the spline.
Just adding info here nothing more.
hope its helpfull.

NakedFun wrote: Looking for opinions. New measurements show about .358" between the outside of the chain and the widest part of the tire with the 3/8" sprocket. Now the chain at it .99 degree angle is angled toward the tire...so that should improve slightly with the 1/2" offset Leon is making me. So with the sprocket at 1/2" that puts the chain with .092" clearance to the frame with that extra .125" offset. So if I were to take another .125" - .200" off the hub, that would increase my frame clearance slightly and leave me with approximately.158" of clearance at the tire. This would still leave me with the sprockets out of alignment by .140" over 27.3" chain span. This equates to .3 degrees deflection. Is this OK? If I took that much more out of the hub for a total of .340" that theoretically would only leave me .018" to the tire which seems close. The other option would be to go out to 5/8" front, which means frame interference for sure, but then drop what I need to mill extra out of the hub to .215" from .200". Thoughts?

Cory

personaly , i would focus on getting the 2 sprockets to align perfectly. since leon can make any offset, this should be easy. as far as which sprocket to move, it doesnt really matter that much. as u have discovered, there r pro's and cons at both ends. choose which ever 1 u feel most comfy with. if u choose a larger offset,u may be fine with a 180 tire. if u choose less hub, u may need a 170 tire.
i did booth and still ended up with a 170 tire.

i took 9mm off the rear hub.
my project.
kzrider.com/forum/11-projects/103381-76-kz900-upgrade

Well I also ordered up another offset sprocket from PBI and got the 5/8". With this, I can mill the hub enough to have "perfect" alingment, tire clearance and I will probable slice the frame and lay a "c" channel in or plate and weld it back in. I may not end up using Leons, but atleast I'll have the option.

Cory