compression ratio on my 04 raptor

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Feb 6, 2005 | 09:04 PM

camshaft9

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Joined: May 2004

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compression ratio on my 04 raptor

i was wondering what my stock comrssion ratio was and what was the highest ratio i could go up to and still run pump gas

Feb 6, 2005 | 09:05 PM

maddog56

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Joined: Sep 2002

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compression ratio on my 04 raptor

Look on the Yamaha website and SEARCH.

Feb 7, 2005 | 01:07 AM

CTracingraptor

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compression ratio on my 04 raptor

According to the Manual
Minimum octane 86(R+M/2) or 92 (RON)

Piston Compression
Standard 181 psi
Minimum 152 psi
Maximum 196 psi

i run pump gas on my 11:1 compression with no detonation, anything higher than 11:1 and plan on using race gas

stock is 9:5 :1 i think....