Sorry, I didn't keep any records of the build. I did do a lot of research on swing arm to counter shaft sprocket and rear axle center line points.
Be ready to cut that frame to the point of no return. This is not a project for the light hearted, if you get it wrong it's junk! I've built and help build a lot of bikes (not like this) mostly Flat trackers and raod racers, but it all has the same concepts for a stree bike.
The motor only goes in one place. Not much movement. One of the hardest parts was figure out the rear shock mount. Because you'll see when you get to that point, it takes a lot of thinking to get everything BOLTED together with two chambers it the way.
Then you'll need to fabricate a whole new sub frame because all your mounts are gone. Pipe are in the way and so on and on and on. Don't forget you'll need to service it too. After the body is off, I remove 10 bolts and can adjust exhaust valves. 8 of those are the chambers.
Caution; Think long and hard before you start. After you start, don't give up till IT takes YOU for a ride.


It's 310lbs with half a tank of fuel.
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If you push very hard, the RG500 will fit, I did it so can you!
1992 NSR250/RG500= nsrg500