Sprocket sounds?

[Westy_mate]

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]

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]

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]

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...
:niceone:

[Westy_mate]

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...
:niceone:

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]

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.
<img src=http://www.get-into-cycling.com/images/ss34.jpg>

[sinfull]

It's fucked...

+1

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

[BASS-TREBLE]

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]

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]

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]

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]

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]

$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.

[MSTRS]

Yep. And don't leave it. A worn sprocket is very quick to cause irreversible wear/damage to a new chain. A few hundred kms is enough.

[Juzz976]

What they said,

Should be sold as complete kits, new sprokets and sleep easy.

[Westy_mate]

They guys at cycle treads said they looked fine and didnt need replacing.. Should i not trust them?

[MSTRS]

If you were able to compare the profile/s of yours and new ones, you'd see the difference. At least renew the front one...it poses the biggest risk to the new chain, due to the tight turn it requires from said chain.

[nothingflash]

They guys at cycle treads said they looked fine and didnt need replacing.. Should i not trust them?

You're gonna get some saying yes and others saying no - so it's a pointless question. I'd do the sprockets and sleep easy - your call though. When your new chain is fucked in a few hundred k's will you replace the sprockets then even though they look the same as they do today?

[rwh]

A comment I heard, that makes sense to me, is that a worn chain will damage sprockets because the distance between the links has increased, so they don't line up. However a worn sprocket still has the same distance between the teeth, so they still line up with a new chain, so no more damage done.

I'd be interested to hear how the worn sprocket would wear the chain more than normal.

Richard

[MSTRS]

Chain and sprockets bed in and wear together, from new.The wear on each suits the wear on the others.
If you introduce a new part, the wear on the other parts forces the new part to wear excessively in order to bed in.
This is true for chain and/or sprocket/s.

[Westy_mate]

That is one cheap sprocket kit. i got quoted 150 from cycle treads for a sprocket kit. any idea if those sprockets are any good?

[The Everlasting]

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

That's what I did myself,stuck a new chain on old sprockets,within 2500km it was buggered,I then replaced the sprockets and chain,which is what I should have done in the first place. If i had done it properly the first time,would have saved me around $130.

[hayd3n]

they just want a repeat customer

[Westy_mate]

Well i could do one of the following... Go to cycletreads and pay 150 for their sprockets or i could order the ones off that website mentioned above. Ideas?

[MSTRS]

JT and SunStar are both good brands. Any bike shop will have their catalogues. No need to buy Honda OEM.

[Westy_mate]

Ended up buying the pair from that website supplier in the previous page. apparently they will be shipped to Cycle treads and they will call me when available haha

[Westy_mate]

Ended up buying the pair from that website supplier in the previous page. apparently they will be shipped to Cycle treads and they will call me when available haha

just thinking now, i hope they are the appropriate ones for my new chain... right?