@nobby62

Yeah availability issue, the RGV engines seem to be plentiful and cheap enough; though going on what fontyyy and others have said, sounds like a bad engine choice.

@carbonpaul

I did think about the CR 500, thanks for the heads up.
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1991 Honda NSR 250 MC21 R
2010 Yamaha YZF R6 13s
1999 Aprilia RS 154