Quote:
Originally Posted by Gundamnitpete
The mid sized bikes are my fav. I don't think you need a flywheel though. My xr100 was
plenty on idle for NTH circles. I would say, street tires, bar, and HB
and you've got an awesome stunt bike
I'm seriously considering picking one up to stunt again. I had a blast on my xr100 and rocked the shit out of it. It was a 1990 too, so I'd bet a brand new crf150 would pull a bit harder on idle 
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an xr100 is a completely different bike in every aspect thn a 150r especially the motor, you would never need a heavier flywheel for any xr they are all turds and super easy to do anything on, but the R models is a racebike that winds up 10,000 times faster than an xr could ever dream of doing. you wouldnt need a heavier flywheel for stuntin but it would make trail riding a lot smoother and more controllable for the R model but the xr's are a trail bike so thier motors are slugs