Motoren Israel pistons

Would anyone happen to know the ring end gap and land clearance specs for the Motoren Israel forged pistons? These kits come with the forged pistons, rings, pins and circlips.

I had a shop install these (bored 1st over) in a R90 and I'm doing a pushrod seal replacement.

Since I never checked them myself and the bike uses a little bit of oil, I figured now is the time to check them out. Heads will be gone through as well.

https://www.motoren-israel.com/Shop...0/6-90S-in-90-5-mm-1-Uebermass-2-St::558.html

Thanks,

RPGR90s

One would think they could tell you. They have a datasheet on the website, but it's empty. Doesn't sound that helpful.

Wossner pistons

20774 said:

One would think they could tell you. They have a datasheet on the website, but it's empty. Doesn't sound that helpful.

Click to expand...

I believe these are manufactured by Wossner.

I did some measuring and see rings gaps as follows:

Top: .011"
Middle: .015"
Oil Control rings, top and bottom: .022"

I had the cylinders bored 1st over (.020"). These pistons measure 3.5610" at the skirts. Cylinders measure 3.5620 with no ovality and almost zero taper (< .0005"). So if my math is correct, piston to cylinder clearance is around .001", which I believe is in spec.

I'm having Randy Long do the heads and he notes that the guides and seats are worn, so I'm hoping that addresses the oil consumption.

RPG