THIS IS THE CAM CHAIN TENSIONER GUIDE THE WHEEL FITS

THE GUIDE ON THE LEFT WAS THE LAST ONE FROM KAWASAKI SO NO LONGER AVAILABLE

ALL YOU HAVE TO DO IS REMOVE THE WORN WHEEL AND REPLACE WITH THE NEW ITEM.
PLEASE REMEMBER TO REPLACE THE ROLLER PIN CIRCLIP WITH THE NEW ONE WE SUPPLY AS REMOVING THE OLD ONE WILL HAVE WEAKEND IT AND IT THEN MAY FAIL.

THE RUBBER CAN WITHSTAND THE HIGH RUNNING TEMPERATURE
AND CORROSIVE ATMOSPHERE OF RUNNING IN AN ENGINE, AND
THE FRICTIONAL WEAR THAT IS CAUSED BY THE CAM CHAIN RUNNING OVER IT
WHILE THE BEARING COMES FROM JAPAN

BRITISH MADE

ON THE LEFT IS AN EXAMPLE OF A WHEEL THAT HAS BEEN WORN OUT BY THE CAM CHAIN, WITH A NEW REPLACEMENT ON THE RIGHT

THE ITEM IS MARKED RED ON THE PARTS DIAGRAM

The reason this wheel wears out is that if the cam chain runs slightly slack, it then runs over the wheel rather than rolling with it.
This then can produce a flat spot, stopping the wheel from turning so all the cam chain does then is wear the rubber down to the metal.

This releases a lot of slack into the chain and the cam chain runs even looser.
The tensioner then cannot cope with the extra length of chain and can cause it to jump over the cam sprockets.

Another reason for the chain to jump over the cam sprockets is the old style tensioner would wear and allow the pin to be pushed back against the spring presure again resulting in the cam chain jumping.

We strongly recomend you replace the old cam chain tensioner with the following upgrade
Tensioner Part#12048-1113 (Black from a ZX11)
Tensioner Part#12048-1139 (Silver KLX650)
Gasket Part# 11009-1858