Crossposting is not so nice and I've posted about this in other places but I don't think I'm going to get an answer so here goes.
I got some rings that were thin. I asked some savy people about them and the answer was the thin rings are due to government regulations. They said I would have to get a piston which had thicker grooves that matched the thiness of the rings. I called some suppliers but they never heard of this. The supplier where I got the rings said they sold 40 sets without an issue. I cannot find any Tecumseh pistons that indicate they are special. There are superseeded number but I've never seen any mention about thin rings being required. I suppose it's possible for a piston and ring to both be superseeded and that it's due to having thin rings and the piston changed to match but I've never heard of this.
The problem is the replacement compression ring was 10 thousands thinner than the original ring. The end gap in the ring is just where it shoudl be on the low end of Tecumseh specifications.
The width of the old ring is 10 thousands more than the new replacement ring. The width is in the dirction of 90 degrees to the bore. That is the width of the outside radious minus the inside radious so not the outer width or thickness of the ring surface that faces the bore.
The rings for the H70 130210D are pretty much not available in Tecumseh NOS stock. Most suppliers have their own sources for this ring. None of the suppliers lists anything about the rings being superceeded or needing a different piston.
Anyone heard about this thin ring ruling?
What effect will a ring 10 thousants thinner have?
