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981 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.) YZ125 * Crankcase clearance required for 57mm and larger 05-16 54.0 54.0 ElectraCoated Deglaze / Hone PK1390 316-3416 846M05400 379-5464 2126CSA 316-0274 S668 316-2396 CW15 316-1902 B1001 316-7001 x 56.0 Racers Choice Bore / Replate PK1391 316-3417 846M05600 379-5465 2205CSA 316-0281 54.5 58.0 GP Series Bore / Replate PK1392 316-3418 846M05800 379-5466 2284CSA 316-0284 ArmorGlide Crankcase Machining Titanium Nitride coated rings CT-2 CT-3 DT175 MX175 Thru 1977 Thru 1977 79-81 79-82 66.0 66.0 Deglaze / Hone 471M06600 316-1610 2598CD 316-2505 S259 316-3105 CW16 316-1903 B1021 316-7021 x 66.5 Bore & Hone 471M06650 316-1611 2618CD 316-2514 50.0 67.0 Bore & Hone 471M06700 316-1612 2638CD 316-2520 67.5 Bore & Hone 471M06750 316-1613 2658CD 316-2529 68.0 Bore & Hone 471M06800 316-1614 2677CD 316-2535 IT175 YZ175 76-81 76-81 66.0 66.0 Deglaze / Hone 374M06600 316-1615 2598CD 316-2505 S259 316-3105 CW16 316-1903 B1021 316-7021 x 66.5 Bore & Hone 374M06650 316-1616 2618CD 316-2514 50.0 67.0 Bore & Hone 374M06700 316-1617 2638CD 316-2520 67.5 Bore & Hone 374M06750 316-1618 2658CD 316-2529 68.0 Bore & Hone 374M06800 316-1619 2677CD 316-2535 RT180 90-98 64.5 64.5 Deglaze / Hone 772M06450 379-5634 2539CD 316-2496 S486 316-3148 CW16 316-1903 B1021 316-7021 x 65.0 Bore & Hone 772M06500 379-5635 2559CD 316-2499 54.0 65.5 Bore & Hone 772M06550 379-5636 2579CD 316-2502 66.0 Bore & Hone 772M06600 379-5637 2598CD 316-2505 IT200 84-86 66.0 66.0 Deglaze / Hone 522M06600 316-1620 2598CD 316-2505 S259 316-3105 CW16 316-1903 B1005 316-7005 x 66.5 Bore & Hone 522M06650 316-1621 2618CD 316-2514 57.0 67.0 Bore & Hone 522M06700 316-1622 2638CD 316-2520 67.5 Bore & Hone 522M06750 316-1623 2658CD 316-2529 68.0 Bore & Hone 522M06800 316-1624 2677CD 316-2535 DT200R * Canadian Model - Not available in the U.S. 89-91 66.0 66.0 Pro-Lite Deglaze / Hone 599M06600 379-5598 2598CD 316-2505 S271 316-3107 CW16 316-1903 B1008 316-7008 x 66.5 Bore & Hone 599M06650 379-5599 2618CD 316-2514 57.0 67.0 Bore & Hone 599M06700 379-5600 2638CD 316-2520 67.5 Bore & Hone 599M06750 379-5601 2658CD 316-2529 68.0 Bore & Hone 599M06800 379-5602 2677CD 316-2535 WR200 92-98 66.8 66.8 Deglaze / Hone 818M06680 316-0414 2628CD 316-2517 S271 316-3107 CW16 316-1903 B1008 316-7008 x 67.0 Bore & Hone 818M06700 316-0415 2638CD 316-2520 57.0 68.5 Bore & Hone 818M06850 316-0418 2697CD 316-2541 YZ250 IT250 DT250 MX250 76-79 78-80 74-79 73-75 70.0 70.0 Deglaze / Hone 234M07000 316-1625 2756CD 316-2556 S343 316-3115 CW18 316-1905 B1003 316-7003 x 70.5 Bore & Hone 234M07050 316-1626 2776CD 316-2562 64.0 71.0 Bore & Hone 234M07100 316-1627 2795CD 316-2568 71.5 Bore & Hone 234M07150 316-1628 2815CD 316-2574 72.0 Bore & Hone 234M07200 316-1629 2835CD 316-2577 YZ250 IT250 80-82 81-82 70.0 70.0 Deglaze / Hone 452M07000 316-1630 2756CD 316-2556 S343 316-3115 CW18 316-1905 B1003 316-7003 x 70.3 Bore & Hone 452M07050 316-1632 2776CD 316-2562 64.0 70.5 Bore & Hone 452M07100 316-1634 2795CD 316-2568 70.8 Bore & Hone 452M07150 316-1635 2815CD 316-2574 71.0 Bore & Hone 452M07200 316-1636 2835CD 316-2577 IT250 1983 68.0 68.0 Pro-Lite Deglaze / Hone 515M06800 316-1730 2677CD 316-2535 S511 316-3157 CW18 316-1905 B1014 316-7014 x 68.5 Bore & Hone 515M06850 316-1732 2697CD 316-2541 68.0 69.0 Bore & Hone 515M06900 316-1734 2717CD 316-2547 69.5 Bore & Hone 515M06950 316-1736 2736CD 316-2553 70.0 Bore & Hone 515M07000 316-1737 2756CD 316-2556 YZ250 * Power Valve must be modified for 69mm and larger 83-87 68.0 68.0 Pro-Lite Deglaze / Hone 560M06800 316-1645 2677CD 316-2535 S511 316-3157 CW18 316-1905 B1014 316-7014 x 68.5 Bore & Hone 560M06850 316-1647 2697CD 316-2541 68.0 69.0 Bore & Hone 560M06900 316-1649 2717CD 316-2547 69.5 Bore & Hone 560M06950 316-1651 2736CD 316-2553 70.0 Bore & Hone 560M07000 316-1652 2756CD 316-2556


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