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 5th/6th Gear low rumble/vibration/sound

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BCRider




PostSubject: 5th/6th Gear low rumble/vibration/sound   Tue Aug 18, 2015 5:10 pm

Hey guys,
I've got a mainly stock '14 wrr and have recently begun feeling/hearing something while in 5th/6th gears, going heavier on the throttle on uphill roads (mid rpms, around 90+ kph)
It's like a low rumble/vibration that I can hear slightly, but feel more than hear, kind of comes and goes, like a droning sort of feel/sound, but more consistent while holding mid/high rpms at high speeds up hill.
I'm guessing I've been noticing it since changing the rear tire a couple months ago.

My chain is tensioned right around 11/12mm from swingarm at measure point.

Regarding the tire: It's an MX tire that is not DOT approved (a mistake I will not make again on this bike, please no lecture dddog ..the knobs are almost worn down now.

Any thoughts much appreciated!

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dhally

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PostSubject: Re: 5th/6th Gear low rumble/vibration/sound   Tue Aug 18, 2015 6:04 pm

It absolutely could be the rear tire. Knobbies can cause a lot of vibration, and it occurs at certain speeds.

Also could be the chain, but that usually happens at lower power settings, almost coasting.

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Biglake




PostSubject: Re: 5th/6th Gear low rumble/vibration/sound   Wed Aug 19, 2015 11:38 am

Im guessing its the tire, my motoz enduro it (dot) does it too.
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BCRider




PostSubject: Re: 5th/6th Gear low rumble/vibration/sound   Tue Aug 25, 2015 2:12 pm

Thanks for the replies guys.. I'll see what happens when I change the tires next week and go from there.
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wristpin




PostSubject: Re: 5th/6th Gear low rumble/vibration/sound   Wed Aug 26, 2015 4:08 pm

I've had the same issue in the past, for me it was the chain. Try to adjust it to spec and see if you notice any change. I would notice a change after adjusting it, then I finally replaced chain and sprockets, all good since then.
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