The rear compartment of the left and right engine case halves form the transmission housing or case. An access cover, or trapdoor, is mounted on the left side of the case (inside) behind the primary cover. The main components of the transmission are mounted to this trapdoor to allow you to detach the one cover (together with all the transmission components) for easy removal and servicing without having to split the engine cases in half which otherwise would be a full engine re-build.
* This quantity is for a dry application. When changing oil, use your own judgement not to overfill as you won't need a full 1.5 pints to re-fill the oil.
Transmission
Internal Gear Ratios are the number of clutch gear revolutions to drive the mainshaft sprocket one revolution.
Overall Gear Ratios are the number of engine revolutions to drive rear wheel one revolution.
Year (all models) Internal Gear Ratios
1st
2nd
3rd
4th
1986
2.52
1.82
1.38
1.00
1987-1990
2.29
1.66
1.25
1.00
Year (all models)
Overall Gear Ratios
1st
2nd
3rd
4th
1986
10.00
7.25
5.48
3.97
1987-1990
9.12
6.59
4.98
3.97
Final Drive (Trans to Wheel)
Final Drive Sprocket Torque (on Chain Drive Models)
Nut Description
Nut Size
Tightening Torque
Notes
1986-90
1-1/8“ Nut - Right-hand Threads
35-64 ft-lbs
Max 90ft-lbs
(use only 2 or 3 drops of RED threadlocker on this nut)