Yamaha TZR250 (1987) [122/333] Inspection and repair

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ENG INSPECTION AND REPAIR Piston Size P Standard Oversize 1 Oversize 2 56 39 56 40 mm 2 22 56 65 mm 2 23 in 56 90 mm 2 24 in If out of specification replace piston and piston rings as a set 3rd step Calculate the piston to cylinder clearance w following formula Piston to cylinder Clearance Cylinder Bore C Piston Skirt Diameter P If out of specification rebore or rep cylinder and replace piston and piston as a set Piston to cylinder Clearance 0 050 0 055 mm 0 0019 0 0021 in Limit 0 1 mm 0 004 ini PISTON RINGS 1 Measure Side clearance Out of specification Replace piston an rings Use a Feeler Gauge J Side Clearance 4 43 Top 2nd 0 020 0 060 0 0008 0 00 0 030 0 065 0 0012 0 00

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