Whats the cause detonation?

Down pipe hitting frame as motor torques over?


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Would anyone have a picture of plugs that have had knock? Would be great to know what to look for.
Joel
 
wow guys two supper usefull links this thread will be added to my permanent reference material

what clear depiction of need to install new plugs then pulls then pull plugs and read. a clear canvass looks to be critically important to process!!!

thanks thanks and thanks
joel

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