I went into town a while back and oil was dripping out of my engine, specifically on the right hand side (as seated on the bike) and it seemed to be coming from the crank case cover area. This is in fact the side with the V-Belt (as owners would know). So I (having no choice) headed home (35km of country roads) and the belt was slipping well by the time I got home.
Obviously I needed to check what the hell was wrong so stripped the right side of the bike
yes that's fresh drippings ... bugger.
So the covers and casing had to come off (which I've done many times in replacing a belt, but this time the backing cover had to come off to expose the shafts and everything underneath. I'd seen this cover (on the primary shaft) before and expected it covered the seal ...
which it does and once the inner cover is taken off it simply lifts off. There is a rubber seal around that (visible on the outside) don't loose that.
It was pretty clear that the seal was leaking and had an amount of road gunge on it ... part was identified and Yamaha said it was ex-Japan (not surprising) and so I just covered everything and waited.
as you can see its quite large ...
The seal arrived and I >carefully< drilled two small holes into the seal (with the new one in my hand I could see where I should drill) and inserted two "chipboard" self tapping screws in far enough to get a good drip on the steel (NOTE: use a small diameter drill) and with "vice grips" a long solid screw driver as a lever popped the old one off.
After that point I made this quick video
which shows the interior of the casing (but not the bearing, which is still further back in).
Lastly I'll show you the tool I made in better detail here.
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