Just asking if the 98 buell S3 motor will fit in a similar vintage Sportster chassis. I have a super light weight dirt track chassis with glass work from Mert, built to take a Sportster Iron Head, and a line on an inexpensive crashed '98 S3 thunderbolt. I thought this might be a low buck, fun project and a neat little ride when finished.

I know this has probably been covered in this forum somewhere, but also, I was wondering if the chain drive parts are available to convert the drive side to a chain. Anyway if someone can just give me the benefit of some hard earned knowledge, I'd appreciate it. Thanks! :doh

A friend did.
S3 engine in a 2000 rigid mount XL frame.
I put a complete SE ignition system for 1200 sportster.
The only problem is the speedo.
You don't have a speed sensor for electronic XL speedo on former S3 engine.
He put a cable model one.

there will be some problems with motor fitment. the xl was set up for a four speed which is skinnier than the five speed because the charging system. So ull need to move the side stand mount. the motor wont fit if left alone.