660 raptor big bore

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05-15-2014, 02:34 AM

200es

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660 raptor big bore

i have a 2003 660 raptor that im thinking about making a 686. if i do can i still use normal pump gas? and how reliable would it still be

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05-15-2014, 08:03 AM

LT80

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Ask Mickey..
Micky Dunlaps "4 stroke tech".

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05-15-2014, 01:41 PM

Raptor450

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Nothing is as reliable is stock, if it runs good I would leave it alone until it's time for a rebuild. You're not going to gain a whole lot of power from just a 686 piston. Pump gas depends on your compression, stay below 12:1 and you can run pump gas. Usually anything over 12:1 will require some race fuel mixture. JE make good, light-weight pistons.

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