SYNCHRO-BALANCEOscillating CounterbalanceTo do so remove two small screws from cover and insert1/8" (3.18 mm) diameter locating pins through screwhole and into timing hole provided in counterweights, Fig.6.Fig. 6 - Timing Counterbalance GearsWith the piston at TOP DEAD CENTER, install thecrankcase cover assembly and cover gasket. Removethe locating pins. Coat threads of timing hole screwswith a non-hardening sealant, then install screws andfibre sealing washers.If counterweights are removed from crankcase cover,exercise care in handling or cleaning to prevent losingneedle bearings.ASSEMBLY OF COUNTERWEIGHTSInstall counterweights on shafts in crankcase cover.Install counterweight retainers and torque screws to 50inch pounds (.57 mkp or 5.6 Nm).SERVICE PROCEDURES FORMODEL SERIES 171700, 191700,251700 & 252700 OSCILLATINGCOUNTERBALANCE SYSTEMFig. 7 - Oscillating CounterbalanceDisassembling OscillatingCounterbalanceUse a screwdriver and hammer to open the connectingrod cap screw locks - remove connecting rod screws -remove connecting rod and piston assembly. Removecrankshaft and counterweight assembly. Removecrankshaft gear - in the event it should fit tight, it can bepried off with two screwdrivers, being careful not todamage the gear. Fig. 8. Save the key on MODELSERIES 171700 only. Key is staked in on MODELSERIES 191700, 251700 and 252700.Fig. 8 - Removing Crankshaft GearDisassemble the counterweight. Open the locks andremove one or two screws holding the halves of thecounterweight together. Separate and remove the dowelpin. link and spacer. Fig. 9.3
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