I bought a 87' CR500 for $250 a couple months ago. It was in very bad shape as the price tag might suggest. Before I could even start it I had to do a good bit of work to even get it to start. Once I did get it running, I could never get it to run quite right. It had throttle response up to about 3/4 throttle, then it would flatten out like it was starved for air.
After riding my friend's 89' CR500 which had that mind bending acceleration that CR500 are made for, I determined to cough up the cash and buy a real 500. I found a 2001 for $2000 a couple hundred miles away and had my brother pick it up on the way home from a business trip. It runs like a dream and is an all around great bike, although the 87' has a much sexier shape if you ask me.
I decided to pull the engine from the 87' to use for sizing while I do the frame conversion so that I could keep riding the 01'. There are only a couple differences to keep in mind. Here is a good link to a page detailing the differences among the different engine years: http://cid-76dd2330685afe13.skydrive.live.com/browse.aspx/Honda%20CR500R%20Tech%20and%20Reference/Tech%20Edits%20as%20of%20july%209th
The differences that matters for using an 87' to size up for 01' swap is that the intake on the cylinder is 8mm shorter on the 01' and the swing arm bushings are not the same diameter.
After cutting the bushings, I tapped them back into the case. Now this engine is ready to go into the new frame (as soon as the frame is ready).
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