[396FISH]

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I have seen similar descriptions but usually mention oscilating or pulsing type noise. This 93 1500I has steady fairly loud moan that stops when 3000rpm is reached. More noticible under light throttle. Have seen alternator isolators blamed for the wobbling type noise. Could this be the same kind of deal? Alternator received new bearing & brushes last summer.

 

[mikef]

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Were the rubber isolators changed at the same time?

 

[sprite123]

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The isolators alone fixed mine. They can make a bit of a rattle too, especially in cold weather- with a cold engine. Switching the lights on (increasing generator load) took up some slack and made mine a bit quieter- this might help you in your diagnosis. Steve W

 

[396FISH]

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No. They looked fine if looks mean anything so I put them back in. Mine's black too!

 

[mikef]

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Mine "looked" good too, but they were hardened and aged. New set is only about $16.

 

[sprite123]

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Mine looked perfect too, but when dropped onto something solid- they made a completely different noise to the new ones, which were far more rubbery. Steve W

 

[Roadhog]

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396FISH. Have you had any timing belt work done recently? New belts will sometimes make that noise at 2000-2500 rpms if they are too tight.

 

[Oregonwinger]

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+1 on the belts.

Isolators are more of a grumbling/rattle at a lower speeds, but, anything is possible, depending on a lot of things. Even carbs out of tune, intake leaks can cause uneven running, building funny noises.

Tell us about your belts. Very loose belts can also slap the belt covers at certain rpm, kinda like a harmonic noise. I had one that one was so loose, it almost wore thru the cover. Not good.

 

[396FISH]

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I had new belts installed at 56000mi. 71000 now. I did'nt do it myself because of time, although I believe I could have. [just handy enough to be dangerous] Did not research enough to know if tension is controlled by an idler or what. Job was done by what I believe to be a good bike mechanic but not a wing specialist. Bike cranks & runs great at any speed. Had one fellow speculate that it might be a cv joint as maybe its a little worse 2 up [angle of joint?] Pumped up shock a little to compensate, can't tell that it helped much. Maybe just more engine load. Damifiknow.

 

[396FISH]

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Ordered isolators. Worth a try for 20 bucks. I'll report back when I have time to install, but first some fish must die! Thanks for you guys input.

 

[396FISH]

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396FISH wrote:

Ordered isolators. Worth a try for 20 bucks. I'll report back when I have time to install, but first some fish must die! Thanks for you guys input.

Finally got time to install isolators & went for a 150 mile Christmas day ride. Much quiter! Also saw holes in front joint boot so RTV siliconpatched that up. Wonder if any of the noise could have been coming from there? Anyhow, you guys were apparantly right on with iso info. Thanks! Still hear it but less. Nature of the beast I guess.