lemur Posted Saturday at 06:03 PM Report Share Posted Saturday at 06:03 PM In theory; your piston wobbled because of either tightness in the wrist pin bearing or a jam sandwich in the piston rings. Quote Link to comment Share on other sites More sharing options...
jrsunt Posted Saturday at 11:10 PM Report Share Posted Saturday at 11:10 PM (edited) I’d be checking the internal diameter of the con rod small end. Even with the slightest play it will give a knocking noise. The piston doesn’t do much other than support the rings, which do all the hard work and wear considerably. If the con rod is slightly out of specification everything will wear as it won’t be runnng true and it will do the same again Edited Saturday at 11:22 PM by jrsunt Quote Link to comment Share on other sites More sharing options...
bobb Posted 14 hours ago Author Report Share Posted 14 hours ago Lemur what do you mean with jam sandwich? Quote Link to comment Share on other sites More sharing options...
lemur Posted 11 hours ago Report Share Posted 11 hours ago 3 hours ago, bobb said: Lemur what do you mean with jam sandwich? When a piston ring pack becomes gummed up from bad fuel the rings stick in the piston grooves, then everything starts to go badly. Once you experience it you will know why I call it a jam sandwich. Quote Link to comment Share on other sites More sharing options...
eagle8 Posted 1 hour ago Report Share Posted 1 hour ago On 12/20/2025 at 9:02 AM, lemur said: You sure you want to hone a plated barrel 🤔 don't think you are suppose to do that. I've had a few plated dirtbikes & have given them a light hone before installing a new piston & rings, i know a lot of other Blokes that have done the same, as long as the mechanic has the correct tool & knows what he is doing there should be no problems. Quote Link to comment Share on other sites More sharing options...
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