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978 WISECO PISTONS Model Years Compression Ratio Stock Engine Bore x Stroke Bore Size Piston Type and Coatings Cylinder and Machining Requirements Top End Kit MTV # Single Piston MTV # Ring Set MTV # Piston Pin MTV # Circlip MTV # Top End Bearing MTV # Yamaha 2-Stroke (cont.) YZ80 76-80 49.0 49.0 Deglaze / Hone 457M04900 316-1506 1929CD 316-2412 S538 316-3165 CW12 316-1900 B1042 316-7042 x 49.5 Bore & Hone 457M04950 316-1508 1949CD 316-2415 42.0 50.0 Bore & Hone 457M05000 316-1510 1969CD 316-2418 50.5 Bore & Hone 457M05050 316-1511 1988CD 316-2421 51.0 Bore & Hone 457M05100 316-1512 2008CD 316-2425 YZ80 1981 49.0 51.0 Deglaze / Hone 465M05100 316-1519 2008CD 316-2425 S538 316-3165 CW12 316-1900 B1043 316-7043 x Bore & Hone 42.0 Bore & Hone YZ80 82-83 47.0 47.0 Deglaze / Hone 477M04700 316-1520 1850CD 316-2400 S538 316-3165 CW12 316-1900 B1043 316-7043 x 47.5 Bore & Hone 477M04750 316-1522 1869CD 316-2403 45.6 48.0 Bore & Hone 477M04800 316-1524 1890CD 316-2406 48.5 Bore & Hone 477M04850 316-1525 1909CD 316-2409 49.0 Bore & Hone 477M04900 316-1526 1929CD 316-2412 YZ80 1984 48.0 48.5 Deglaze / Hone 508M04850 316-1528 1909CS 316-2655 S538 316-3165 CW12 316-1900 B1015 316-7015 x 49.0 Bore & Hone 508M04900 316-1529 1929CS 316-2656 45.6 50.0 Bore & Hone 508M05000 316-1531 1969CS 316-2861 YZ80 1985 48.0 48.0 Deglaze / Hone 520M04800 316-1532 1890CS 316-2654 S538 316-3165 CW12 316-1900 B1015 316-7015 x 48.5 Bore & Hone 520M04850 316-1533 1909CS 316-2655 45.6 49.0 Bore & Hone 520M04900 316-1534 1929CS 316-2656 49.5 Bore & Hone 520M04950 316-1535 1949CS 316-2658 50.0 Bore & Hone 520M05000 316-1536 1969CS 316-2861 YZ80 86-87 48.0 48.0 Deglaze / Hone 520M04800 316-1532 1890CS 316-2654 S538 316-3165 CW12 316-1900 B1015 316-7015 x 48.5 Bore & Hone PK1706 316-3738 520M04850 316-1533 1909CS 316-2655 45.6 49.0 Bore & Hone 520M04900 316-1534 1929CS 316-2656 49.5 Bore & Hone 520M04950 316-1535 1949CS 316-2658 50.0 Bore & Hone 520M05000 316-1536 1969CS 316-2861 YZ80 88-92 48.0 48.0 Deglaze / Hone PK1710 316-3742 569M04800 316-1537 1890CS 316-2654 S538 316-3165 CW12 316-1900 B1015 316-7015 x 48.5 Bore & Hone PK1711 316-3743 569M04850 316-1538 1909CS 316-2655 45.6 49.0 Bore & Hone PK1712 316-3744 569M04900 316-1539 1929CS 316-2656 49.5 Bore & Hone PK1713 316-3745 569M04950 316-1540 1949CS 316-2658 50.0 Bore & Hone PK1714 316-3746 569M05000 316-1541 1969CS 316-2861 YZ80 * International Bore - Not available in U.S. 93-01 46.0 46.0 Pro-Lite Deglaze / Hone PK1715 316-3747 671M04600 379-5457 1810CS 379-5458 S517 316-3161 CW14 316-1901 B1012 316-7012 x 47.8 YZ80 93-01 47.0 47.0 Pro-Lite Deglaze / Hone PK1553 316-3617 646M04700 316-1815 1850CS 316-2650 S517 316-3161 CW14 316-1901 B1012 316-7012 x 47.5 Bore / Replate PK1554 316-3618 646M04750 316-1816 1869CS 316-2653 47.8 48.0 Bore / Replate PK1555 316-3619 646M04800 316-1817 1890CS 316-2654 48.5 Bore / Replate 646M04850 316-1818 1909CS 316-2655 49.0 Bore / Replate PK1557 316-3621 646M04900 316-1819 1929CS 316-2656 YZ80 * Crankcase clearance required for 50mm and larger 93-01 52.5 52.5 Racers Choice Bore / Replate PK1186 316-1394 767M05250 379-5480 2067CSA 316-0269 S288 316-3111 CW14 316-1901 B1012 316-7012 x ArmorGlide Crankcase Machining 47.8 Titanium Nitride coated rings YZ85 02-16 47.5 47.5 Pro-Lite Deglaze / Hone PK1202 316-1410 805M04750 316-8081 1869CS 316-2653 S517 316-3161 CW14 316-1901 B1012 316-7012 x 48.0 Bore / Replate PK1203 316-1411 805M04800 379-5644 1890CS 316-2654 47.8 48.5 Bore / Replate PK1204 316-1412 805M04850 379-5645 1909CS 316-2655 49.5 Bore / Replate PK1205 316-1413 805M04950 316-8082 1949CS 316-2658 YZ85 * Crankcase clearance required for 50mm and larger 02-16 52.5 52.5 Racers Choice Bore / Replate PK1343 316-3084 767M05250 379-5480 2067CSA 316-0269 S288 316-3111 CW14 316-1901 B1012 316-7012 x ArmorGlide Crankcase Machining 47.8 Titanium Nitride coated rings


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