Question about Triumph Trophy 900 Motorcycles

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Triumph Trophy 900 sounds top endy when accellerating hard. They tell me that this is normal. Engine sounds fine when ticking over with no unusual sounds.

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I disbelieve what "they" are telling you however, if this sound is abnormal to you and has drawn your attention to it then I'd say it's your bike telling you there is something wrong.

I've worked on engines for almost 50 years now from 1 to over 700 horse power they all talk to someone that listens and understands the sounds sort of a mechanical language.

Here are a few of the things the engine may be telling you.
Pre ignition would be my first guess without hearing the sound myself, this is an easy fix by using a better grade of gas with a higher octane rating. I have in the past carried small pre measured containers of octane boost and dump one in the tank at each fill of 87 octane gas.
If your pump gas is below 87 then that's the problem and if yo do nothing about pre ignition it'll destroy the pistons and the engine if left.

Another thing is one or more valves out of adjustment "hydrolic lifters" or not they do get sloppy and could be due to poor oil, wrong oil viscosity/grade, just worn out engine oil needing a change that fix isn't a total fix but changing to a better quality oil check your manual to see what is recommended, not all engine oil is created equal.

Another thing is the overhead valve system is driven by a chain, this chain has a tension-er and if it's worn this chain becomes loose and will rattle in there something real bad. Not only that because of the slack in the chain it will alter the valve timing which will no doubt affect the engine performance and possibly cause pre ignition. If this chain is loose and not serviced it will brake and I've seen them where they had almost cut the engine into two pieces.

So you got pre-ignition, poor oil, cam chain or even to lean a gas mix at high speed which will cause pre ignition as well.

Posted on Apr 04, 2011


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