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Engine Mechanical TopicsDiscussion for motor builds, cams, head work, stripped bolts and other engine related issues. The good and the bad. If it goes round and around or up and down, post it here.
Looks like detonation on rear cylinder, thats why its cleaner. Not destroyed yet but could use a better tune.
I would ask them to look into it as its totally stock, if it was mine I would be checking injector on that cylinder .
Do you what know what detonation looks like?? Cause that's not it.. that's a lean cylinder.. Don't fill the guys head with crisp..