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Is this rubber needed? How in the world would cam chain EVER get loose enough between the sprockets to hit cover case? And if so, how much OTHER trouble would the engine be in? Thinking of leaving it out...





Part # 5
https://www.partzilla.com/catalog/yamah ... haft-chain

What so you?

I agree with you on the fact that there would be lots of other bad stuff going on if the chain was loose enough to hit that, but it is there for a reason. Why not just clean it really well and epoxy it back in place?

That little bit may not be there to protect the cover, it may prevent cam chain 'snatch' from causing a cam to become mechanically mistimed.

Just the little distance that the CCT plunger moves is enough to allow the cam chain to jump teeth on the crank sprocket, also resulting in a mechanically mistimed engine. A couple of teeth on the crank sprocket is enough to cause the valves to be moving into the cylinder as the piston is coming up. It's not a pretty sight under the valve cover when that happens.

So, do ya feel lucky? Umm, based on your track record I'd think it's a bad idea to leave that little bit out.

Part purchased! I need not get in a hurry now... I need new to me ignition coils too so looks like the front end is coming off.

dcarver wrote: ↑Fri Aug 02, 2019 5:19 pm ... I need new to me ignition coils too so looks like the front end is coming off.

So, what's with the ignition coils?

I would put the part back in... not rubber, some kind of plastic.
FYI ignition coils can be replaced with individual coil on plug setup if you're so inclined... what's wrong with yours?

raYzerman wrote: ↑Fri Aug 02, 2019 9:08 pm I would put the part back in... not rubber, some kind of plastic.
FYI ignition coils can be replaced with individual coil on plug setup if you're so inclined... what's wrong with yours?

Part ordered and will ride Naomi/Wabs/Uncle Dutch until part arrives. Wish I had 2 lifts. One bike gets on the 'project needs part list' and the lift is consumed. Fortunately, hot out here now so riding not as desirable.

Over the years.. trim lead length 1/8 here, 1/8 there. Now leads too short to remove caps from plugs without wire pulling out. Only way to remove caps safely is to remove water pipe. Too much work. Found used 17k mile 2006 coils, wires, caps for 75 USD delivered.

Also internal cap corrosion.


The price of caps alone is staggering...

raYzerman wrote: ↑Fri Aug 02, 2019 9:08 pm FYI ignition coils can be replaced with individual coil on plug setup if you're so inclined...

Have you done a COP setup on a GenII - or know someone who has? You can get aftermarket stuff pretty cheap but reliability has been an issue for some. Best bet might be to find Yamaha parts from a wrecked bike.

I think that is something that I might like to try if I ever have to replace ignition bits. Not much point in doing it unless stuff needs replacing anyway.