I'm rebuilding my XR4, engine on up, and I bought a non-running donor bike a while back. So I have a 2nd set of forks, shock, wheels. I used to race flattrack a "few" years ago and thought I'd like to put this bike back together and use the spares to cut down the suspension, lace up 19" rims, and race the old timers class now and again. Anyone do something like this with an XR4? Smaller tank, seat/glass combo? Down pipe?