2 Stroke ring end gap setting?
Posted January 09, 2007 - 07:02 PM
Posted January 10, 2007 - 11:35 AM
The Wiseco number is a limit for new rings. If the gap is less than what they say then the rings might expand too much and get jacked into the cylinder walls.
Posted January 10, 2007 - 12:29 PM
I ended up calling Weisco this morning. They said use their values (bore X .004) for their pistons, which are forged. OEM pistons, which are usually cast, have different values. That explains the large values in the service manuals.
I don't understand what the piston has to do with ring gap. The ring itself may be a different material but even then there's bugger all difference in thermal expansion. Barrel material makes a difference, the old SG iron sleeves don't grow as much as chromed alloy. Maybe Weisco have a slightly different locating pin setup? Suzuki are certainly likely to be more risk-adverse, they'd rather you were a smidgeon down on power than seized....
I assume the ring is one piece? is it parallel or slightly tapered?