mcbou46 Posted August 30, 2013 Report Share Posted August 30, 2013 Posting for a little advise really.... I've got a 2008 model 4rt, in June time I had a 280 kit fitted (Athena) heard pretty good things about the make but not so bank breaking as a s3 kit... whilst running it in after the change the engine was really loud, you could really hear the piston working, I was reassured by a montesa owners this is pretty normal after having the 280 fitted. They were right after couple of weeks it really quietened down but now there is a tapping sound coming from the engine on tick over and the first quarter of the throttle... I'm keen on the maintenance, I run Castrol engine oil and elf in the gearbox so its not like i'm running crap through it... can anyone point me in the right direction to solve it!?!?! cheers. Quote Link to comment Share on other sites More sharing options...
krazyosucowboy Posted August 31, 2013 Report Share Posted August 31, 2013 From your description sounds like a loose valve. Quote Link to comment Share on other sites More sharing options...
warby beta Posted September 22, 2013 Report Share Posted September 22, 2013 (edited) My 280 (whatever pidcocks supplied) is noisy on idle, sounds like its coming from the clutch side of the bike. It's been like this for 9 months, gets ridden hard pretty much every weekend and got thrashed round the manx 2 day, it has never changed so im just going with the flow. Edited September 22, 2013 by warby beta Quote Link to comment Share on other sites More sharing options...
gaz12349 Posted November 6, 2020 Report Share Posted November 6, 2020 On 8/31/2013 at 3:53 AM, krazyosucowboy said: From your description sounds like a loose valve. A loose valve would mince the engine.... Quote Link to comment Share on other sites More sharing options...
lineaway Posted November 6, 2020 Report Share Posted November 6, 2020 I was alwayd told you need the bigger header pipe when you do the big bore kit. So did you do the work yourself? Quote Link to comment Share on other sites More sharing options...
pauls320 Posted November 6, 2020 Report Share Posted November 6, 2020 Have you ruled out a loose timing chain ,tensioner ? 1 Quote Link to comment Share on other sites More sharing options...
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