Just going to say here; boiling water is enough to drop the barrels out of the cylinders...............
Sound like a loose crimp fit, or?Just going to say here; boiling water is enough to drop the barrels out of the cylinders...............
Yamaha manufactured the barrels at a light interference fit. The different thermal expansion rate between steel and aluminum is enough to make it a slip fit at 200F.S
Sound like a loose crimp fit, or?
Hmm. So what is the operating temperature for a cylinder? Water often seems to boil off, at least on other bikes. I just tend to think that with such a moderate interference fit, the heat transfer from liner to cylinder would be compromised. When installing larger liners for 750 cc or larger engines, is the same "loose" fit used?Yamaha manufactured the barrels at a light interference fit. The different thermal expansion rate between steel and aluminum is enough to make it a slip fit at 200F.
Is the JE 416 or 476?All weighed in grams with supplied wrist pin and rings
Ask and ye shall receive.
Stock bore used
View attachment 234433
Cruizing image +.5mm
View attachment 234435
JE +2mm used
View attachment 234434
Mikes, XS650Yamaha 80mm big bore
View attachment 234436
Wisco 80mm big bore (with 22mm wrist pin)
View attachment 234437
When I was racing Formula Vee, a lifetime ago, I built my own engines. We had to run the 40h.p. 1200, stock pistons (77mm) except for lightening. I'd sit there for hours with a die grinder and a triple beam scale getting them down to the minimum legal weight which was 330g. Funny, can't remember where I put my coffee cup, but I remember obscure specs from 40 years ago. Thanks for the clarification.
Appreciated. I'll now be bookmarking this nugget.Ask and ye shall receive.
Interesting, where from?there was a 0.001 difference in the pistons.
Don't think it would be a SG cylinder. A SG should have a normal 256 type cam chain adjuster I think. Also posted the other day pic of the front side of a SG barrel.
GS?pic of the front side of a SG barrel.
GS sorry typo.
interesting When last had Mr bore do a bunch of jugs for Cruzin pistons he said "I got tired of measuring pistons that were all EXACTLY the same size".Cruzinimage