@ninja I always went with Tsubaki Chains (Jap 🇯🇵 )
https://www.bandcexpress.co.uk/pages/news/latest-news-and-offers/tsubaki-chain---in-all-sizes.htm

@spookdog said in fitting later engine cases to older engine:

@dan28
I didn’t know that there was a plastic side case, but if it has the same pumps it should be ok. I’d keep my original oil pump if it’s good. Just cause it’s calibrated right.

89 cases are plastic the later cases are alloy
The oil pumps have a different part number not sure about water pump.

Carry a plug spanner and the next time it happens shut off the fuel and remove the plug, then kick it over ten/ twenty times to clear it. If it starts ok let us know...
Also try putting the old plug back in, could be a defect...
I’d give the reeds an eyeball as well, just to check they’re closed...

@jonne123

You can put it in from the side.
Just lever out a bush, or put a screwdriver in one side and tap out the other...
You shouldn’t t need to split the cases. Just lift the engine up in the frame till you have access...

Edited for feckups 😐

As mentioned the diamond shape fits the pulley with the square / rectangular end as well

The grooves in the power valve aren't for O-rings, instead these fit into the ends caps as you cant refit the valve into the cylinder with O-rings in the grooves 😉