Niro Posted June 9, 2022 Report Share Posted June 9, 2022 (edited) Hello, Any idea what this grinding noise might be? The noise can be heard mainly while idling or rolling with throttle closed 1970 Montesa Cota 247 grinding noise Spoiler 1970 Montesa Cota 247 grinding noise Edited June 9, 2022 by Niro Quote Link to comment Share on other sites More sharing options...
lineaway Posted June 10, 2022 Report Share Posted June 10, 2022 Sounds more than an idle. What oil ratio are you mixing in that old Bike. My first trials bike was a 1970 247 also, but that was 50 years ago! Quote Link to comment Share on other sites More sharing options...
sdm Posted July 17, 2022 Report Share Posted July 17, 2022 Sounds pretty normal to me but I may be missing exactly what you are hearing. Might have a bit of piston rattle but not unusual imo. The cylinder fins can make any noise sound louder some times. Also try pulling the clutch in at idle to see if it changes. You might be hearing some primary gear noise.. Quote Link to comment Share on other sites More sharing options...
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