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Buell Forum » Old School Buell » Archives OSB 001 » Archive through October 05, 2006 » 1997 M2 Cyclone « Previous Next »

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Jimmy77
Posted on Monday, October 02, 2006 - 04:35 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
What should the compression be on the 1203 engine?
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Spiderman
Posted on Monday, October 02, 2006 - 05:05 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
what color are the heads?
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Blake
Posted on Monday, October 02, 2006 - 11:16 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
If I recall correctly, a '97 Cyclone should be showing at least 150 psi during a hot compression test. Much more than 180 psi could be problematic.
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Jimmy77
Posted on Monday, October 02, 2006 - 11:23 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Not sure what color the heads are. Will see tomorrow when I'm buying it.

I figured about 150 psi new from the factory, but I've never heard of and engine being higher than stock. Normally lower compression would be a sign of a worn engine, and a variance of more than 10 psi could mean a warped head.
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Captainkirk
Posted on Tuesday, October 03, 2006 - 12:51 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Compression can and will be higher with an excessive buildup of carbon on the head and/or piston dome.
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Jimmy77
Posted on Tuesday, October 03, 2006 - 08:38 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
Good to know...
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Bomber
Posted on Tuesday, October 03, 2006 - 09:43 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)
variance could also come from badly sealing rings, valve train issue, a leaky head gasket, and so on -- some expensive, some not . . . . .
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