SOURCE: will a 2001 r1 engine fit a 1999 r1
If the 2001 is with carburetor it is basically the same engine. But that year changed to the fuel injected engine which is a pain to fit.
Depends what you call major modifications. You are certainly going to need some high grade cutting and welding. Many would regard those as major modifications. Some would not! Additionally some basic research as to the length and diameter of the fork tubes will tell you a lot. I assume that you have worked out whether the length and alignment of the drive shaft is the same.
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