"Pok" sound on pulling away

[Warthog]

Well sorry to be rather vague, but everytime I pull away from standstill, I get a couple of random "pok" sounds from roughly the front of the bike. They are getting louder now, so I am starting to worry. Revving the bike seems to show the noise isn't from the engine, so I think I have discovered the problem: When I grab my front brake discs and pull them back and forth inline with the wheel I can replicate a kind of pok noise. The outer disc has a few mm of movement at the floating points. I have ridden off with my disc lock on a few times, so has it knackered my discs? I know they are floating, but I never noticed that you can make them move. Is it dangerous to ride with them like that? Do you reckon this is the "pok" noise? i.e. it only occurs after I have used the front brake the stop.

Any advice welcome

[yorkie_chris]

Get front wheel off ground and check brakes aren't binding.

You can use discs that rattle about a bit safely IMO ... you should see my spare ones lol

[vardypeeps]

Yeah same as Yorkie Chris. Check your brake calipers are not binding. If it aint that it might be your engine misfiring as it's getting louder?

[454697819]

chain slipping off front sprocket teeth..

[haggis]

If you mean that they rotate a little bit whilst the carrier stays put, then I think my discs do that too. The old set before definitely did that. It's nothing to worry about, I'd say. I dont think it's disclock damage, i never use one.

But if you mean they're moving side to side more than they should, like the pads pushing them does, then maybe you have a broken spring washer? If you look at the inner face of the disc buttons you'll see them.

HTH

[Warthog]

Cheers for the suggestions.

Get front wheel off ground and check brakes aren't binding.

You can use discs that rattle about a bit safely IMO ... you should see my spare ones lol

The bike rolls freely and I did the brakes and calipers myself recently, so I am fairly sure they aren't binding. The "pok" is not immediately on pulling away, it is a few "pok"s as I rise through the rev range in first gear. I shall have the wheel off the ground again to make sure, it might have moved.

Yeah same as Yorkie Chris. Check your brake calipers are not binding. If it aint that it might be your engine misfiring as it's getting louder?

I revved the engine in neutral and I don't think it makes the "pok" sound. Maybe it is if it is under load. Was worried that is was my engine at firwst, but now not so sure.

chain slipping off front sprocket teeth..

I really hope not! I would imagine that that is much more feelable than just a "pok" noise. Will check in any case.

If you mean that they rotate a little bit whilst the carrier stays put, then I think my discs do that too. The old set before definitely did that. It's nothing to worry about, I'd say. I dont think it's disclock damage, i never use one.

But if you mean they're moving side to side more than they should, like the pads pushing them does, then maybe you have a broken spring washer? If you look at the inner face of the disc buttons you'll see them.

HTH

They rotate is what I meant. I don't think the move from side to side.

[Warthog]

What does a misfire sound like and what causes it?

[edmurrgr]

I would also check the chain for tight spots / stiff links, try giving it a good clean and re-lube, and see if the noise reduces / goes away.

[Warthog]

I would also check the chain for tight spots / stiff links, try giving it a good clean and re-lube, and see if the noise reduces / goes away.


Seems it might well be this. I took my helmet and ear plugs out and rode up and down the road. Its a lot louder and seems to be coming from the chain slapping and jumping around. Had a look at the chain, I had recently adjusted it, but it was slacker again and definitely has a tight spot and a stiff link or two that causes it to jump about when turning. Guess that is it. Ordered a new chain and sprockets.

[edmurrgr]

Let us know if that sorts it out