We race a 2T on an oval track. The only 86mm pistons we could source at a reasonable price have 2mm top and 2nd rings with 4mm oil rings. Wide 2mm rings are evidently not good on performance and we would like to go for 1.5mm or even 1.2mm rings. Total Seal evidently do a ring spacer that allows one to fit 1.2mm rings in a 2mm ring groove. Has anyone had experience with this option? Is there any other alternative besides going for another more expensive piston with 1.5mm grooves?
Forum input would be appreciated.