1 - 6GENINFOSPECIAL TOOLSSPECIAL TOOLSThe proper special tools are necessary for complete and accurate tune-up and assembly. Using thecorrect special tool will help prevent damage caused by the use of improper tools or improvisedtechniques. The shape and part number used for the special tool differ by country, so two types areprovided. Refer to the list provided to avoid errors when placing an order.NOTE:l For U.S.A. and CDN, use part number starting with “YM-”, “YU-”, “YS-” or “ACC-”.l For others, use part number starting with “90890-”.Part number Tool name/How to use IllustrationYU-1083-A90890-0108490890-01085Small slide hammer setWeightSlide hammer boltThese tools are used when removing or installing therocker arm shafts.YU-1083-A 90890-0108490890-01085YU-1135-A, 90890-01135 Crankcase separating toolThese tools are used to split the crankcase as well asremove the crankshaft from either case.YU-1135-A 90890-01135YU-3097, 90890-01252YU-1256Dial gauge & stand setStandThese tools are used to check each part for runout orbend.YU-3097YU-125690890-01252YU-90050, 90890-01274YU-90050, 90890-01275YU-90063, 90890-01278YU-91044, 90890-04081Crankcase installing toolCrankshaft installer potCrankshaft installer boltAdaptorSpacer (crankshaft installer)These tools are used to install the crankshaft.YU-90050YU-91044YU-9006390890-0127490890-0127590890-0127890890-04081YM-1326, 90890-01326YM-1300, 90890-01294T-handleDamper rod holderThese tools are used for holding the damper rodholder when removing or installing the damper rodholder.YM-1326YM-130090890-0132690890-01294YU-1304, 90890-01304 Piston pin puller setThis tool is used to remove the piston pin.YU-1304 90890-01304YM-8035, 90890-01311 Tappet adjusting toolThis tool is necessary for adjusting valve clearance.YM-8035 90890-01311