Has any one punched out the cyl on there srx and would I have to upgrade the primary clutch too?
mopar1rules
Active member
first off, your cylinders are nicasil plated, and not cast, so its not just a simple procedure to punch out the cylinders a little. your better off porting if your looking for decent hp gains. leave bores alone. also, no reason to upgrade from the stock yamaha clutch, as its a good unit already.