Cota300rr Posted September 13, 2022 Report Share Posted September 13, 2022 Hoping for a bit of advice, purchased a 2017 Cota 300RR this year and I notice it has a bit of a knock. I have several friends with Montesas and none seem to knock this loud. I have been told it's normal for them to knock a bit. I've checked valves and cam chain tension but it really sounds like a piston knock to me. I know she's got some hours on her. I suppose a video would be the best way to show you guys, I'll have to get one up here later on. I am concerned I'm going to damage something running it though, but I want to know if I'm going to need to do a piston soon. From everything I read these are not known for knocking or needing pistons, so I'm hoping it's just a normal thing. Quote Link to comment Share on other sites More sharing options...
TMofCumbria Posted September 14, 2022 Report Share Posted September 14, 2022 Take the spark plug out and alternately push down on the front and back of the piston with a plastic or wooden rod. If you can make the piston rock / click its probably going to need a new piston and possibly bore work as well. Certainly strip to measure. Quote Link to comment Share on other sites More sharing options...
jonnyc21 Posted September 15, 2022 Report Share Posted September 15, 2022 Have you switched fuel type? I haven't had a problem with running different octane levels in my 17 Cota 300RR but if your running the low stuff try higher octane or the other way around? I don't really expect this to be the issue but at least something to consider? Quote Link to comment Share on other sites More sharing options...
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