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Any suggestion's on engine upgrade ?? looking to add as much power as possible. not wanting to add NOS
 

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I did the 686 and mudbuster cam and am really happy with the results.
 

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Grizzly 800cc Big Bore Kit
Make your 660 into a 800cc Your cylinder, crank, and case are needed for modification. This kit punches your cylinder out to such a massive size that we have to resleeve your cylinder, stroke your crank and modify your case so it all fits. Also comes with a new hi-compression piston, hi-perf. camshaft, and all the nessecary gaskets.

I have a local shop runs this for over 3k installed
 
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