Transmission/Gearbox, Drive Shaft, Rear Differential

The power transmission of the motorcycle is comprised of the clutch, gearbox, propeller shaft and the final
drive.

Clutch

M1/M1M Clutch

M1S Clutch

The clutch transmits torque from the engine to the gearbox, and allows disengagement of the engine from the gearbox during shifting of the gears, and when braking to a stop. The clutch allows smooth starting of the motorcycle from rest, as well as protecting the power train against damage when the engine speed or drive wheel speed is suddenly changed. The clutch is of dry double-disk design.

The clutch release mechanism is controlled by means of the lever on the left grip of the handle bar. With the clutch lever released, the engine is engaged to the gearbox. When the clutch lever is squeezed, the engine is disengaged from the gearbox.

Use the clutch lever for starting from rest and for gear shifting. Under heavy traffic conditions avoid slipping the clutch excessively, as this will cause heavy wear of the disks. When stopped for any length of time (e.g., a traffic light), it is best to shift into neutral and release the clutch lever. Holding the clutch in for long periods will cause excessive heating and wear.

Adjustment

The clutch control lever (located on the handle bar) should have a 5 - 8 mm play. This play is measured at the lever end. The normal play of the lever ensures full engagement and disengagement of the clutch. If the play is smaller than specified, the clutch slips. With excessive play, the clutch drags, i.e. the disengagement is incomplete. Use the adjusting screw on the clutch control cable to adjust the play.

Transmission/Gearbox

M1:

M1M:

M1S:

The principal parts of the gearbox are the split box with covers, clutch shaft and main shaft with gears and shift sleeves, the gear shift mechanism, the kick starter and the reverse gear engagement mechanism.

Transmission/Gearbox Internals

The clutch shaft is installed in the ball and roller bearings. The shaft is made integral with the gear
rims of the 1st, 2nd and 3rd gears. The gear of the 4th gear is fixed on a segment key. The main shaft is set on two ball bearings. The pinions of the 1st, 2nd, 3rd and 4th gears rotate freely over the splines outer surface. Two sleeves are set on the splines of the main shaft, the gears are connected with the shaft by means of the gearshift sleeve. Involute teeth are threaded on the outer surface of the engagement sleeve of the 1st and 2nd gears. The gears are lubricated through labyrinth cavities in the casing, axial and radial bores in the shaft. The gear of the kick-starter has an additional small rim. The intermediate gear is installed on the neck of the bracket that travels in the longitudinal direction of the shaft. Bronze bushings are pressed into the gear holes of the kick-starter, intermediate and 1st gear of the main shaft.

Reverse Gear Mechanism

The M1M and M1S often include a transmission with a reverse gear. Is this true of the M1S??? The reverse gear engagement mechanism consists of quadrant with a shaft with the reverse gear engagement lever secured on it, together with an intermediate gear set on the bracket. The intermediate gear travels along the shaft, from the reverse gear engagement quadrant. When the reverse gear is engaged, the intermediate gear travels with the bracket along the shaft and connects the small rim of the starting gear with the rim of the sleeve engaging the 1 st and 2 nd gears on the main shaft. The reverse gear must be engaged from neutral. When the reverse gear engagement lever is returned to its initial position, the gear shift mechanism is set into the neutral position.

Kickstarter

The kick-starter consists of shaft with pawl, the kick lever, return spring and kick-starter gear. The shaft is supported by the bushings provided in the gearbox casing.

Shifter mechanism / linkage

The gear shift mechanism . Gear shifting is performed in sequence. Downshifts are made by pushing down front of the gearshift lever, while up shifts are made by pushing down on the rear of the gearshift lever arm.

Drive Shaft

M1/M1M/M1S: Driveshaft

The drive shaft incorporates a flexible joint, the drive shaft and the universal joint. The flexible joint is a rubber-coupling sleeve. The propeller shaft is aligned by means of the ball end of the main shaft that enters the socket in the front end of the propeller shaft.

Rear differential

M1/M1M/M1S: Rear differential

(Help Us: Add your knowledge here!)

Copyright 2006. All Rights Reserved. Chang Jiang Collective / Besiex / B. 'Quincy' Cabell