Drop in my GPZ1100 UT cams yesterday and had to determine that the rubber damper part of the top idler sprocket are disintegated and had a lot of play.
I have a set of three older idler sprockets and take the best parts of them for a rubber segment and bearing swap.
All parts of the cam chain sprockets are a pess fit compnents and are interchangeable. So i made out of two bad one useable top idler sprocket as at temporary fix.
I had discover that the needle bearing was "Made in Germany" by INA bearning Company.
Actualy two versions of the bearing. One had one more roller in the cage than the other. Early KZ650 used the same idler assigned a different part number, different bearing may be the difference in part number? Exactly the same otherwise. Honda also used the same design, with the rubber damper, except with an oil-lite type bearing sleeve. Used on the top idler of the CB450-500T's
I skim off the old rubber from the sprocket rings and replace the centres with aluminium and new INA bearings.
Funny how they used imperial bearings for these when everything else is metric.
I wait till I have a bunch of them then spend an afternoon on the lathe.
Bottom pic shows solid wheel on tensioner bracket.
I use a lightly modified Z650 bracket for these as they had a larger rubber wheel and will accept an idler sprocket where the 900/1000 ones don't.
That's a neat trick Zed1015! Ditto the how much Question? I've got a handful of the larger wheeled KZ650 tensioner, early/late Z1/KZ top towers and bags of the idler sprockets. Do I see Perhaps see a trade??