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techtalk:evo:engmech01 [2020/08/02 01:18] hippysmack [Flywheels] |
techtalk:evo:engmech01 [2020/08/02 02:22] hippysmack [Flywheels] |
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| ====== Flywheels ====== | ====== Flywheels ====== | ||
| + | **Late 1986 flywheels and crankpin bearing changes**. \\ | ||
| + | Information from Technical Service Bulletin #M-927. [[techtalk:miscres:miscres05#tsb_900-949|Click here to see the actual bulletin from this page in the Sportsterpedia]]. \\ | ||
| + | Beginning with crankcase numbers 883cc (1786 083 003) and 1100cc (1886 090 012), a new (F.A.G.) crank pin bearing set and revised flywheels were installed at the factory. \\ | ||
| + | The new crank pin bearing set (using the existing crankpin P/N) consists of three bearings in a package. Early production engines were assembled without thrust washers. \\ | ||
| + | L1986-later production flywheels had thrust washers staked into a counter-bore in the flywheels. The L86 crank pin bearing set retrofits earlier models. \\ | ||
| + | However, the new bearings require a stepped flywheel thrust washer to provide clearance for the wider bearing cages. \\ | ||
| + | You will select the correct thrust washer for your particular assembly and machine off the raised lip in the area of the flywheel thrust washers' I.D. \\ | ||
| + | This lip must be machined off or you will crush the bearing cage as you assemble and torque the crankpin nuts. \\ | ||
| + | [[techtalk:miscres:miscres04#tech_tips_0-199|See Tech Tip #14 in the Sportsterpedia for more information]]. \\ | ||
| + | |||
| + | The L86 XLH883 flywheel assembly is (23905-86A) and the L86 XLH1100 flywheel assembly is (23900-86A). \\ | ||
| + | There were new crank pin bearing clearances also. \\ | ||
| + | The new crank pin bearing set packages were color coded with either a red or a blue identification. This color coding is used by the bearing manufacturer only. \\ | ||
| + | The color coding DOES NOT indicate size selection for crank pin bearing replacement. \\ | ||
| + | |||
| + | **1989 flywheel changes**. \\ | ||
| + | Information from Technical Service Bulletin #M-971. [[techtalk:miscres:miscres05#tsb_950-999|Click here to see the actual bulletin from this page in the Sportsterpedia]]. \\ | ||
| + | Beginning June 1, 1988, flywheels forged from a micro-alloyed steel went into production. Part numbers and color codes of assemblies with the new material were changed. \\ | ||
| + | |||
| **1991-1994 Flywheels**. \\ | **1991-1994 Flywheels**. \\ | ||
| From '91 to '94 the Crankshaft/Flywheel was balanced according to the engine size, either for 883 pistons or 1200 pistons. From 1995-later, the flywheels are balanced to be between the weight of the 883 & 1200 pistons. ((http://hammerperf.com/883conversions.shtml)) This is one reason why riders would use Wiseco pistons in early (pre-2004) 883 to 1200 conversions - the Wiseco 1200 piston & pin was closer to the weight of the 883 combination rather than the stock 1200 piston & pin from HD. | From '91 to '94 the Crankshaft/Flywheel was balanced according to the engine size, either for 883 pistons or 1200 pistons. From 1995-later, the flywheels are balanced to be between the weight of the 883 & 1200 pistons. ((http://hammerperf.com/883conversions.shtml)) This is one reason why riders would use Wiseco pistons in early (pre-2004) 883 to 1200 conversions - the Wiseco 1200 piston & pin was closer to the weight of the 883 combination rather than the stock 1200 piston & pin from HD. | ||
