"Crunchy" noise from rear when accelerating - Stromtrooper Forum : Suzuki V-Strom Motorcycle Forums
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post #1 of 7 Old 09-19-2012, 10:18 PM Thread Starter
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"Crunchy" noise from rear when accelerating

From a stop, under pretty much any load, I hear a crunchy (only way to describe with one word) noise coming seemingly from the rear. I think it's the right side rear...but not certain as it's hard to figure without crashing. This JUST came on.

The sound is a lot like a CV joint that is going bad on a car.

I've checked- rear brake caliper, chain (no kinks or stuck links), lateral play in rear wheel, sprocket....and most anything else I can think of that could make a metallic crunchy noise.

Any thoughts?? Wheel bearing/s?? Again, this only happens under a load...and I've only noticed when pulling from a stop (though it could be there other times). I couldn't even duplicate it on the center stand while throttling and applying rear-brake. only about 23k on the clock.

'06 KLR650
'78 CB750
'04 DL1000

Last edited by maximilian; 09-19-2012 at 10:20 PM.
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post #2 of 7 Old 09-19-2012, 10:25 PM
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Are you still on the original chain? 23K is about average for the life of a chain, and the chain will make that sound when it's on its way out. If you do replace the chain, replace both sprockets as well.
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post #3 of 7 Old 09-20-2012, 01:07 AM
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Could be the cush drive.
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post #4 of 7 Old 09-20-2012, 01:39 PM
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There are three bearings on the rear, two wheel bearings and one sprocket carrier bearing. Any one or more could be a problem. The rubber cushion drive dampers might be worn. Or crud somewhere it shouldn't be. Or the chain and sprockets. Or the chain alignment--don't trust the swingarm marks and sight down the chain for straight running. The chain and sprockets are the most likely culprits at this mileage, but it could be anything. Try removing the rear wheel, see that everything is clean, dry, fits right, and the bearings rotate with no visible rust, no noise, no notchiness--perfectly smoothly. The slightest defect is a bearing will only get worse. Let us know what you find.

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post #5 of 7 Old 09-20-2012, 02:51 PM Thread Starter
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I guess I'll check it out....but not sure how much will become obvious with the wheel off, since I can't get it to make any noise by spinning the wheel or even going through the gears while on the center stand.

The "crunchy" noise is MUCH more than any chain noise. If you've ever heard a front-wheel drive car with bad CV joints.....it's roughly that sound.

The chain is not original of course (23,000 miles)..and it's fine. I also get no lateral movement, or any movement at all at the rear wheel, no matter how hard I try.

Okay, I guess I'll pull the wheel off and see what I can find out. Thanks!

'06 KLR650
'78 CB750
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post #6 of 7 Old 10-01-2012, 01:48 AM
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When you remove the wheel, I'd suggest you pop off the sprocket carrier drum and inspect the rubber bumpers(dampers). It's easy, just stand the wheel up and tap gently on the inside of the sprocket and it will pop off...or you can lay the wheel down on wooden blocks, sprocket side up, and grab the sprocket with both hands(gloved of course) and yank upward gently. Inspect each of the 5 rubber bumpers and see if any of the small securing cones are sheared or starting to shear from dry rot. These rubber bumpers are held in place by a conical tab that is pushed thru a hole in the drum. I discovered mine were bad by accident cuz I decided to install new ones due to age. When I pried each bumper out, the mounting cone broke off easily and I could see upon inspection that the cones had already begun to shear from dirt accumulated in the cracks. The new bumpers are rather soft and pliable but my old ones were hard and brittle. Once the bumpers get brittle, the drum has more movement and can grind against the hub edge. I could see that this was happening because the edge of the drum and hub were gouged and the lips were knurled outward meaning that they were contacting each other violently. This may not be your problem but I hope it helps.

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post #7 of 7 Old 10-01-2012, 11:38 AM
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You don't say quite where in the Arm Pit you are but maybe another Strommer is near by that could help you check your bearings and chain to confirm your observations.
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