Bike clunking sound???

[adam66787]

Hi I am new to the BCF
I have a problem with my bike when I am rolling along in a gear say 2nd for example when I accelerate I will hear a CLUNK sound like half a second after I twist the throttle, I have checked the chain and it all looks good so I have ruled out the chain being the problem.
Dose anyone have an idea what this could be? thanks for any answers.

[Nexus Icon]

What bike is it?

Despite your checking the chain it sounds final drive related. If you're absolutely certain the chain isn't slack, the sprockets aren't worn and the chain hasn't got any dry/tight links then check the cush rubbers in the rear hub for aging and perishing. Once they start to collapse the rear wheel will knock as it catches up with the rotation of the sprocket.

Also, be sure the noise isn't coming from the front. The forks will lift a fair bit going from idle to wide open throttle, even on a little bike.

Really, it'd help to know what the bike is.
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Greetings from Shitsville!

[adam66787]

its a keeway rkv 125 and It had a new chain and sprocket kit fitted about 1k miles back, it has 6k miles on it now

[Northern Monkey]

Does it have a rear drum,
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Fisty: after polishing the tank with the glistenng beads of sweat from my full hot scrotum, I filled the headrace bearings with 10cc of my manmilk

[Rogerborg]

[adam66787]

No it has a rear disk brake

[adam66787]

I just went and checked the rear sprocket and it seems like its got 3 mill play without the wheel Turing, is this cheap to fix?

[Nexus Icon]

[Rogerborg]

Looks like he means free play in the cush drive rubbers.

You can either replace the rubbers or pack them out with pieces of bicycle inner tube if you're ghetto.

That's if this is the cause of the CLUNK though. Do you have a centre stand, and can you reproduce it with the bike stationary?
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Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[Nexus Icon]

Yeah, you're right, I reckon.

OP, they won't be hideously expensive or impossible to replace yourself, it's tracking them down that may be the difficult part.

There are some RKS ones on eBay but I can't find anything for the RKV.
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Greetings from Shitsville!

[adam66787]

Thanks for the reply's, and yes I can reproduce the sound when the bike is on the centre stand so it looks like I need some new rubbers witch is going to be a nightmare as it took around 2 months to order a side panel for it. makes me want to buy a jap bike the amount of problems I have with it like It also has a small oil leek so I need to get a new o ring.

[NJD]

Phoned up any local dealers, there's a kawasaki dealership near me that stocks them (keeway bikes that is).. might be worth a look around if you haven't before.

[Rogerborg]

I'd go with packing them out while you try and source new ones. Again though, do be sure that's the problem. Can you get the clunk by pulling on the chain, forwards and backwards to simulate coming on and off the power?
____________________
Biking is 1/20th as dangerous as horse riding.
GONE: HN125-8, LF-250B, GPz 305, GPZ 500S, Burgman 400 // RIDING: F650GS (800 twin), Royal Enfield Bullet Electra 500 AVL, Ninja 250R because racebike

[Robby]

If a bike managed to knacker a set of cush drive rubbers in 6k miles and less than 5 years, I would be packing them out with inner tube rather than buying identical replacements. Inner tube will be made of better rubber.