Sprocket sounds?

**Westy_mate** · 24th November 2010, 20:13

Hey guys,

So im getting a noise under my Chain Guard at the sprocket, not sure what it is, just lubed my chain and reset it so its not too tight nor loose but the noise is still there! any ideas?

**Urano** · 24th November 2010, 20:21

i've got the idea that without any further info it's difficult to have an idea.

what kind of bike?
what kind of noise is it?
when does it happen?
when has it started?
do you notice anything loose or any visible damage in the area?

"i hear a noise" is quite useless, it could be anything from a leaf sticked on the swingarm to a fucked ball bearing...

**Westy_mate** · 24th November 2010, 20:35

Originally Posted by Urano

i've got the idea that without any further info it's difficult to have an idea.

what kind of bike?
what kind of noise is it?
when does it happen?
when has it started?
do you notice anything loose or any visible damage in the area?

"i hear a noise" is quite useless, it could be anything from a leaf sticked on the swingarm to a fucked ball bearing...

well i figured people would look at the bike on kiwibiker and assume im talking about that one...
Honda CBR 1989 250r MC19
startd making the sound around a week ago and starts when i begin to pick up speed.
the faster i go the louder and fast the noise. Hard to explain how it sounds but almost like something is rubbing against the chain, something mechanical and definitely no leaf. No visible damage nor anything lose.. since lubing the chain it isnt as loud but the noise is still very present. i can also feel the vibrations on my left footpeg and it feels almost like it has a heartbeat ("erererererer crunch crunch etc etc...)

**Urano** · 24th November 2010, 20:58

ok, now's better.
so, it definitely seems something related with the chain.
the best thing to do now is put the bike on a stand and (WITH THE ENGINE OFF!!!) try to move slowly the rear wheel with the hand and try to identify the problem...

**Westy_mate** · 25th November 2010, 05:36

Originally Posted by Urano

ok, now's better.
so, it definitely seems something related with the chain.
the best thing to do now is put the bike on a stand and (WITH THE ENGINE OFF!!!) try to move slowly the rear wheel with the hand and try to identify the problem...

I tried that, But when the wheel is moving slowly its hard to identify the sound because its not very loud. you start to notice it around 20kmph

**MSTRS:Me** · 25th November 2010, 07:40

Originally Posted by Urano

ok, now's better.
so, it definitely seems something related with the chain.
the best thing to do now is put the bike on a stand and (WITH THE ENGINE OFF!!!) try to move slowly the rear wheel with the hand and try to identify the problem...

What you are looking for as you rotate the wheel, is for the chain to go tight at times, and for links that do not sit flat in line with the rest of the chain.
Dunno about a noise, but a rhythmic thumping vibration is what a chain like above does. It's fucked...
This sort of thing, but prolly not as much out of line, and will be on the top (or kinked down if on the lower reach.

**sinfull** · 25th November 2010, 07:43

Originally Posted by MSTRS

It's fucked...

+1

They don't last forever ! How many K's since you done the chain and sprocket ?

**BASS-TREBLE** · 25th November 2010, 07:43

You said you adjusted the chain. My guess is that its not aligned properly and the teeth are making the noise as they leave/enter the chain.
The faster you go, the more it happens so it's louder

**Max Preload** · 25th November 2010, 09:59

Just to clarify, have you pulled the front sprocket cover off to have a look at teh action of the chain over it?

**Westy_mate** · 25th November 2010, 18:44

Originally Posted by Max Preload

Just to clarify, have you pulled the front sprocket cover off to have a look at teh action of the chain over it?

Thanks guys, I ended up buying a new chain for $160. no more problems

Sprockets were in good shape so no need for new ones

**MSTRS:Me** · 26th November 2010, 07:42

So you think.
It's the age-old mistake. A badly worn chain means the sprockets are also toast.
Your 'good shape sprockets' are not, and will quickly destroy your new chain.

**Max Preload** · 26th November 2010, 13:48

Originally Posted by MSTRS

So you think.
It's the age-old mistake. A badly worn chain means the sprockets are also toast.
Your 'good shape sprockets' are not, and will quickly destroy your new chain.

What he said. Ironically, the cheaper front one will do the most.

**Logpot** · 26th November 2010, 14:13

$88.17 for a basic sprocket set and I'm sure you could get these cheaper by shopping around.

http://www.bits4bikes.co.nz/parts/honda/2169.aspx

I'd be looking at changing those when you're attending to your chain.