[φ51×1.0.-2.0(2R)]
[φ53×0.8-0.8-1.5(3R)]
In 1996-97, the shape of the piston for STD/ULTRA85/88cc has been changed to the cylinder head due to the clamping angle of the valve. If the old bore up piston is installed with the current STD/ULTRAs square head (engraved on the fin), the valve and piston will come into contact with the current (new) piston. The thickness of the piston ring of the old and current products is different. (Unit: mm) / Current product 75cc 1.0(A)-1.0(B)-2.0(C) 3 link / Current product 85/88/104/108cc 0.8(A)-0.8(B)-1.5(C) 3 link / Old product 85/88cc 1.0(A)-1.0(B)-2.0(C) 3 link / Old product 85 /88cc 1. .0(A) -2.0(C) 2 Links / Former 117cc 0.8(A)-0.8(B)-1.5(C) 3 Links / Current 124cc 0.8(A)-0.8(B)-1.5(C) 3 Links ● *Bore up piston rings for 4-stroke cars maintain a thin balance of seal, abrasion resistance and reduced friction loss. in the USA. The Bore Up Kit parts have been modified at any time, such as shape changes and dimension changes. If you need repair parts for overhauling, please check the piston before purchasing. Please make sure to check the displacement of the piston ring and piston pin before making your purchase.
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