GR650 top end on GS450 bottom end?

[Big Rich]

Instead of subscribing to this thread, I may as well add to it........

When I wanted a 2-1 exhaust for my GR650, the first choice was the MAC system made for the GS450. I had to cut the headers and add about 1.5" so it would clear the GR's oil pan. There is a moderator on the GSTwins site that put a GR motor in a GS500 frame, and he said it actually fits better than the original motor.........however, he has to take out the motor mount bolts to allow the motor to swing down for valve clearance checks.

With any luck, I will be acquiring a GS450 soon, and I will have a GR motor laying around. If I do attempt to fit the GR motor into the GS frame, I will be sure to report back here (won't be for a while though........).

 

[olddaddy]

Big Rich, keep us, and me posted about your progress on a GR/GS bike. I currently have a GR 650 sitting in it's own frame with a GS 750 swingarm, rear disc set up and a twin front disc fork setup. I want to move it all over onto a GS 750 frame if I can find one. I do have a GS550 frame that might end up being used. Twins are good!

 

[Big Rich]

The GS750 swingarm, huh? I've been looking into that too actually. What wheels are you running front and rear?

 

[olddaddy]

I used the stock GS 750 front and a 16" matching wheel style on the rear. My reasoning was to keep the same rear wheel diameter the engine/tranny were geared for and keep the rear low since I'm short. I dropped the triples trees an inch up front also.