Scooterotica

What's the difference between the non grooved drive side oil plate

https://www.ebay.co.uk/itm/121467221573

And the grooved one

https://www.ebay.co.uk/itm/111259770654

And which one do I need for an Li3 casing with a gp crank?

Cheers

Technically speaking you will gain a hair more case volume by using the grooved one. In reality though I doubt it makes any difference at all. If it helps, the solid type is a later more modern design (dl/GP style).

I tend to use the grooved Italian ones in my builds since the alloy solid type always seemed to be warped.

So any will fit?

Cheers

Broadly, but check the plate is centred - try it in all four positions.

And make sure your Helite seal isn't to thick that it forces the drive plate against the side of the crank, I've recently had a couple from Beedspeed that apart from being to thick were cut on the p155. I now use two of the thin ones from Harry Barlow paired up...spot on..