If you are try to go with a 88.5 bore gasket on a stock sr 86mm bore that way too much of a gap. Usually you only go .5 up. If you have a 86 bore, just buy a 86 mm bore gasket. Usually only people who overbore thier cylinders go to a 87 mm gasket. 87 mm would be ok for stock bore but i dont know if I would feel comfortable going to an 88.5 mm gasket.
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