for the last week every time i take off ive been hearing somthing coming from the rear of the bike i dont know what it is but i felt the back spocet and its loose so i take it there rubber mounted and the rubbers worn away what do i need to replace?
The rear sprocket drives the rear wheel through a series of rubber fingers known as a 'cush drive'. It's designed to take the lash and shock out of the chain giving smoother gear changes and acceleration/decelleration transitions. If the cush drive has gone hard/broken then it may result in rough gear changes and very jumpy transitions on/off throttle. I highly doubt a broken cush drive would make a noise, but i may be wrong.
it might not be making the nosie but she is broken like you say "may result in rough gear changes and very jumpy transitions on/off throttle" so how would i go about changing this and what will it set me back
Ummm... To replace it it's as easy as removing the rear wheel and more often than not the cush drive will just fall out. As for cost, not a clue as it's not something i've ever had to replace!
just looked at the bike and the sound that i was talking about is eather coming from the chain (front or back sproket) or in the grear box... its a crunching sound
If its a rapid crunching (more like grinding) then check the inside of the left foot peg and see if the chain is making contact with it. Whilst your down there take a look around to see if there's anything else the chain could be touching whilst in motion.
grinding crunch but its over quick but it might happen 1-2-3 times over five secons then it will go for about 2-3-4 secons then its back so its pritty comon the chains not missing the sprockets i had the front sprocket casing off this morning and was pritty shore its not the chain catching on anything im thinking that its maybe im missing a a tooth in the gear box maybe on the drive gear because it happens in every gear and i know my gear box is fukd slip out of gears has trouble finding gears edit: forgot to add i can feel the crunch in the left footpeg (mostly) if im going slow enuf to not get vibrations of the road
If your trans is fubar, then looking for a similar noise is fruitless. You could look at the chain as a whole and determine if it has been some time between lubes. A couple of sticky links can mimick this. Or the chain need replacing due to stretch.
Just too answer your question earlier David my bike also has movement in the back sprocket. I priced the rubber component up at my local Yamaha dealer ordered in @ $21.60 not bad Huh !
Are you sure the chain is not loose and jumping under load, particularly if the sprockets/chain are worn???? They make horrible noises when they jump the teeth... You should have no more than 20mm of movement vertically in the chain measured in the centre between the sprockets...
Just found out when i picked up the part from Yamaha its $20 for one of the the rubber dampeners. So i think you need six off them too replace them all around the rear sprocket. <!-- s --><img src="{SMILIES_PATH}/icon_sad.gif" alt="" title="Sad" /><!-- s --> yikes more money haha.
Is it absolutely necessary to change the dampeners? I have slight movement on my rear sprocket (in respect to the wheel). Is it an urgent or necessary fix?
Slight movement is quite open to interpretation. If your talking a wiggle, then that's fine. If your talking a couple of millimetres then you should consider replacing the cush drive in the near future; more than that and i'd prioritise it.
OH its an easy couple of mms... This sucks. Thanks koma <!-- s --><img src="{SMILIES_PATH}/icon_smile.gif" alt="" title="Smile" /><!-- s -->
