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Buell Forum » Knowledge Vault (tech, parts, apparel, & accessories topics) » Engine » Big Mechanicals: Head, Cyl, Piston, Rod, Crank, Flywheel, Cases, Bearings » Archive through September 02, 2007 » Rebuilt it due to detonation; what should I do now? « Previous Next »

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Buell82
Posted on Saturday, August 04, 2007 - 02:53 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

I finally have gotten my bike back together from a total top end rebuild. My rear cylinder had a bad detonation and melted my piston. So, now that I have my bike running again, what things can I do to make sure this wont happen again? I still have no idea exactly why it happened first time?!? I dont believe it is running lean. Any help and info you guys can give me will be greatly appreciated.
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Rick_a
Posted on Saturday, August 11, 2007 - 01:42 pm:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Properly assembled intake manifold seals, proper jetting, proper timing, and usning proper heat range plugs usually does the trick.
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Diablobrian
Posted on Sunday, August 12, 2007 - 10:12 am:   Edit Post Delete Post View Post/Check IP Print Post    Move Post (Custodian/Admin Only) Ban Poster IP (Custodian/Admin only)

Reading plugs can be tricky. If you are not 100% sure of how it's running have someone that is very experienced double
check for you. Be sure to do the check properly too. (see procedeure in the second link)

Here is a great write up on the plugs themselves:
http://www.strappe.com/plugs.html

And here is a good v-twin specific guide to reading the plugs:
http://www.cyclespot.com/Jetting.html

Finally here is a photo guide (even if they are rather extreme examples) to reading your plugs:
http://www.sa750.com/plugs/plugs.htm

Hope this helps at least a little bit.
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