Question about 2004 Husqvarna TC 450

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Engine rattle when bike is under load

Engine sounds perfect when running but when the bike is under load ie when im in any high gear and i slowly accellerate a loud rattle appears (like cam chain is rattling against the casings) which will dissaper at high revs or low, have replaced piston and rings but still same, cam chain tensioner is fine, the teeth off the starter cog were all sheered off ! before the rattle started, which i replaced, also replaced the oil pump as it looked scored due to bits of metal in the oil, could have reduced oil pressure and starved some engine components of oil ? i know its difficult with out hearing the bike but all comments will be great, thanks ben

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This sounds like a classic case of pre-ignition, aka detonation and engine knock. Change to premium gas and put in a set of spark plugs that are one heat range colder than stock. It is good that you are handling this before the engine destroys itself. Yes, destroys itself. That is what pre-ignition will do. Hot carbon deposits ignite the fuel before the spark plug does. This is hard on the rod, main bearings and piston. Beat on the top of a piston with a hammer. That is what your piston will quickly look like with pre-ignition.

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Posted on Apr 23, 2009

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Check the tappets and adjust it i think it is the problem from tappets

Posted on Nov 22, 2012

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