lemur Posted December 20, 2025 Report Share Posted December 20, 2025 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 December 20, 2025 Report Share Posted December 20, 2025 (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 December 20, 2025 by jrsunt Quote Link to comment Share on other sites More sharing options...
bobb Posted December 21, 2025 Author Report Share Posted December 21, 2025 Lemur what do you mean with jam sandwich? Quote Link to comment Share on other sites More sharing options...
lemur Posted December 21, 2025 Report Share Posted December 21, 2025 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 December 21, 2025 Report Share Posted December 21, 2025 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...
lemur Posted December 22, 2025 Report Share Posted December 22, 2025 14 hours ago, eagle8 said: 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. So you are scratching up your fresh new spray coat of ultra hard nickel and silicon carbide that is actually harder then your piston rings for what purpose 🤔 Quote Link to comment Share on other sites More sharing options...
eagle8 Posted December 24, 2025 Report Share Posted December 24, 2025 (edited) It's to prepare the cylinder surface for the new piston & rings plus it helps with lubrication They are given a hone before their first use with a diamond stones hone, most good mechanics have 1 in their assortment of tools . Edited December 24, 2025 by eagle8 Quote Link to comment Share on other sites More sharing options...
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