Ross pistons 88 mm

[LaverdaSoren]

Two new Ross pistons 88 mm with rings, pins and clips.
350€ + postage.

 

[IAG]

Fitment?

 

[motoddrob]

By my calculations that's about 1350cc
Big slugs!
Doubt there is enough room in the barrels to fit them

 

[motoddrob]

If they're for a twin that'll give you 900cc.
What size are the 880cc twin Pistons?

 

[redax5]

If they're for a twin that'll give you 900cc.
What size are the 880cc twin Pistons?

87mm

 

[LaverdaSoren]

They are for a twin.
You need to change the sleeves, I bought my LA-sleeves through Wolfgang. Then a workshop helped me with machining the barrels and upper crankcase to fit the bigger sleeves.
The reason I am selling them is I wanted to be more on the safe side and went for 88 mm pistons from Red.
After that I have heard that 88 mm pistons has been used in a number of engines without problems.
Lately I was talking to a friend who has built a twin with specially made 89 mm pistons. He has had no problems with oil leaks or reliability.....

 

[LaverdaSoren]

I meant I bought 87 mm pistons from Red.

 

[piranha-bro2]

Head and base gasket options become an issue.

 

[LaverdaSoren]

As I went for 87 mm pistons I could buy gaskets from Andy Wagner. The sleeve holes in the base gasket was a tiny bit too small for my sleeves but it was easy to grind off without destroying the gasket.
I have seen that Moto Officina offers 900 cc conversions so they can probably sell head gaskets.
My friend who went for 89 mm made head gasket out of copper.