Question about Yamaha Road Star Motorcycles

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I have a 2003 Yamaha Roadstar 1600. Since it was new, I have noticed an annoying 'chirping' sound that seems to come from the engine or gear box/primary. It seems to improve with a new oil change but in extreme hot weather, now or old oil doesn't matter...it's there. It only seems to stop, (when it's pronounced), when I come to a complete stop. Various Yamaha mechanics have told me various things, such as 'it's just a normal Yamaha sound', 'it's the tappets', it's the huge gear-teeth that will slowly wear down & lessen the problem after many, many thousands of miles, etc., etc.. I love the bike, (better than any Harley I've owned), but this noise bugs the hell out of me, even though the mechanics tell me my bike is in perfect shape & not to worry. I just had a complete servicing done: new oil, filters, valves, etc., etc.. The ride home in 100 deg. weather seemed to make the 'chirping' problem even more pronounced. What's the deal? What's the cause? What can be done about it? Am I just stuck with it? I would love to be able to correct the problem, even if it is 'typical' for a Yamaha. Your help & advice would be appreciated, as no Yamaha mechanics or even the Yamaha Motor Corp. itself seems to have an answer for me. Thanks you, Jim

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  • payaso168 Jul 18, 2009

    Thank you for your reply and suggested solution to my Yamaha Roadstarr problem. I will try the 'friction modifier' (Avil) as you suggested before trying a synthetic oil. Question, though, can I simply add the Avil volume (which I assume is relative minor) without draining some of the existing oil? Also, If I have to resort to using a synthetic oil, what weight & brand would you suggest, and is there ANY potential harm to the engine in switching from conventional to synthetic?



    Thanks again,

    Jim

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Jim, I suggest you stay away from "friction modifiers". Oil additives are snake oil and not one has ever been proven to have a greater effect than simply changing your oil. An additive might make the noise go away, but putting 130w gear lube in the engine might make it go away too, with some rather harmful side effects.

As far as changing to synthetic oil, it will not harm the bike in any way, shape, or form. The main benefit to synthetic vs conventional oil is the ash content. Synthetic has none, conventional has minute amounts. Use whatever brand you like and weight appropriate for the temperature range you will be riding in.

If the Yamaha mechanic and corporation are telling you the sound is normal for your bike you can either learn to live with it or find a mechanic / machine shop to figure out what component is making the noise and have them re-engineer the offending part so it does not do that. It would probably be cheaper to buy a bike that doesn't make the noise.

Good luck.

Posted on Jul 19, 2009

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THIS IS MOST LIKELY A NOISY BEARING OR BUSHING, ADD A BOTTLE OF "FRICTION MODIFIER" TO THE OIL (AVIL AT ANY AUTO PARTS STORE), ALSO USE SYNTHETIC OIL, IF THIS DOESN'T SEEM TO AFFECT THE NOISE YOU HAVE A HARD PART FAILURE AND THE TRANS WILL NEED TO BE TAKEN APART TO FIND THE PROBLEM.

Posted on Jul 17, 2009

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