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Engine Knock Beta Rev 3


mil
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Hi,

I've been riding alot of fire roads and trails recently and riding the bike in 5th gear at some speed. When I roll off the throttle there seems to be a knocking or clunking that I can;t place. The bike runs fine but don;t like random noises. Could this be the piston? It's an 04 model and I bought it 6 months ago. I don;t know if Piston/ ring hase been changed- would this be recommended? How easy is the job and cost of parts?

Many thanks for your help.

Mil

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if the engine pings or knocks on the overun after you have shut off, i would recommend a de-coke, i do my bike twice a year at least. remove the head, barrel and piston, scrape the carbon off with a razor blade and the finish off using a scouring pad and brake cleaner. also remove the rings and clean out the ring grooves. works ever time on my bike. hope this helps. :D

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if it sounds like somebody hitting your cylinder head with a toffee hammer and probably always under the same circumstances then almost certainly one of three cheap things will cure it,

A, use super unleaded

B, put a 32.5 pilot jet in,

C, or take the head off and decoke the top of the piston as described above.

the first will cost you a fiver and take no time, the second 8 quid and remove the carb and replace the jet 1 hour max, to get the head off ( and the rest to actually get at the thing) is going to take a leisurely morning and the price of a head gasket another few quid.

not likely to be your rings..

Edited by totalshell
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Thanks for the replies everyone. I will strip it down and de-coke and hopefully that will sort the issue.

Is it necessary to replace the head gasket when I strip it down? Or will it seal ok with the original back in?

Cheers fot your help

Mil

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you can re-use the old head gasket , use a very thin smear of good quality "instant gasket" too much will block the water passages in the gasket. really the best practice is to use a new head gasket, the base gasket if in good condition will always "go again". get the spanners out and good luck!

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Has there been an alteration to 04 and later? I had to pivot the motor down to get clearance on my 03 for the barrel to come off - the lug for the top engine mount hit the underside of the "tank". Was tempted to "ease" the tank a bit but I don't think it's feasible with what is the strongest alloy tank in the world. Don't ask about the major operation to get the sumpguard bolted back, I wouldn't want to do that again. Even worse than the old MAR with its fine pitch theads.

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Thanks Barry. It's obviously one of these things where tolerances vary between individual bikes. I couldn't get the barrel off the studs to twist it. If I ever have to remove it again I'll try shortening the studs by the visible single thread which might just make the difference.

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