Another modern swap

FWIW, I wouldn't tackle the swingarm swap unless you have access to a lathe, or a generous sole who has a lathe. There will be plenty of new round parts fabricated in this swap, along with handy mockup parts to check fit before cutting the actual parts. However, you're ahead of the game by having a matching wheel and swingarm. As Doug mentioned, look at the project threads to get an idea of how the swaps were tackled with other arms. The process will be similar. The new arm will need to be bushed to fit your pivot bolt at a minimum. You may need to narrow the new arm to fit between your frame. Once you have the arm mounted, throw the wheel on so you can project the chain line forward to the output sprocket. This will probably show you need more offset than there's room for without modifying the frame. Then look at the Cush drive to see how much room you have to shave off, paying attention to the chain not rubbing the tire. Before I cut anything I mocked it all up based on my dimensions. Spaced the wheel over the amount I planned to remove from the hub, and spaced the output sprocket over so I could double check alignment. Then threw on a chain to triple check with my eyecrometer. Maybe more work than necessary but I hate throwing scrap parts across the shop screaming in disgust.

Take measurements and make drawings. Plan out what you want to cut and fabricate and keep track of the dimensions. One part change ripples through the design more than you know. Try to think far ahead on each part so you don't box yourself in the corner. Above all, you want solid parts built to last. The last thing you want is a bike you're afraid to ride.

Alan

spdygon wrote: Doug......just view your post on the kx900. I did not see what it take to install the swingarm. Was it a direct fit...did you have to shave one side to line up the spockets or wheel. my is a 93 I think it was the first year there were watercooled so maybe motor was different then the 92 aircooled.
Thx for your help

The '92 swingarm is just slightly narrower than the 900 frame. The '93 should be the same width as the '92. I put a '94 Gsxr750W arm in my '89 Gsxr750 so the Gsxr swingarms of that era are all pretty swappable. I used pivot inner races from a '87 Gsxr750 in my '92 arm to fit the Kz frame. The pivot bearings are the same, so the races OD are similar but the earlier Gsxr use a 15mm axle (same as the Kz's). I can't remember what the bearing size is for the '93.

I have not dealt with the wheel yet. I'm going with a 6" Hayabusa rim so I opened up a real can of worms for myself. You have a 5.5" rim so you'll probably have to grab a 5/8" offset from sprocket and see how the rear sprocket lines up.

I'll try to help you as much as I can, but unfortunately I haven't conquered all the hurdles myself.

Later, Doug

Looks like a great project spdygon I think it would be a good idea to start a Build Thread in the "Projects" area


To fit the GSXR swingarm is straight forward enough and can be done with Suzuki parts. If the swingarm bushes are in good condition all you need is two bearing bushes and Dust caps from a GS750 1000 GSX etc you can then use your KZ swingarm spindle If you have any lateral play use shims under the Dust caps

Puffin....hope it all it will take for the swingarm because I have no access to any special tools Huybus mention.
Ones I start on swapping I will start a post on the Project Forum.
Thank to all that have respond .

Sorry i could not find these photos any quicker :blush: but here you will see the GSXR and GS bushings

Puffin.......I see I will be working on the bike this weekend.

I will be starting a new post over at the Project section.

ok...im back to the chassis forum. can someone direct me in the right direction ......need to replace front fork seals and dust boots. what tools do i need or should i just pay $150 for labor and oil. i have the parts already.

maybe this will help you.

kzrider.com/forum/5-chassis/353185-upside-down-fork-rebuild-2-0

leon