Petcocks
In the two petcocks are screens to prevent dirt from entering the float bowl. These screensmust be
cleaned regularly. Caution - Only large volume petcocks can be used for adequate fuel flow.
3.
AIR FILTER
Before each race the air filter should be checked and cleaned. A paper filter should be cleaned from the
inside out, using compressed air. The foam filter is washed in gasoline or solvent. Then, the foam filter
should be penetrated thoroughly with motor oil (SAE 201, and both ends of either filter smeared with
grease for sealing. Before re-installation of the filter, the inside of the air cleaner box should also be
cleaned. The rubber boot leading to the carburetor should be checked to seethat it is sealed properly.
-
4.
CLUTCH, PRIMARY CHAIN - GEAR BOX
The clutch is checked by actual operation. The
springs will eventually have to be replaced or the
clutch plates will be replaced if there is excessive
slippage. The clutch handlebar lever is adjusted
so that there is 2 to 3 mm play in it. (.080" to
.120"). The primary chain is checked for excess
play. The magnetic drain plug is cleaned every
time the oil is changed to see if any broken rol-
lers from the chain are attached. Replace any de-
fective parts immediately.
-
17. Clutch adjustment at the lever
5.
CYLINDER AND PISTON
The play between piston and cylinder wall should be checked with a feeler gauge. The same should be
done to the piston ring end gap to assuregood compression. A softened head gasket should be installed
and the cylinder head bolts tightened to 18 foot pounds.
6,
CRANK SHAFT
While the cylinder is not on the crankcases the play in the lower connecting rod bearing should be
checked.
7.
FRAME
The frames are free of maintenance. The steering head welds should be checked for cracks. If a crack is
discovered, the frame should be welded by a qualified welder. The steering head bearing races should be
inspected regularly for signs of rust or abrasions.
8.
TELESCOP FORKS - STEERING
Changing fork oil - The upper triple clamp pinch bolts (8 mm Allen) must be loosened, also remove the
air escape caps (36 mm). Next, the caps (27 mm) at the very bottom of the forks are loosened to remove
fork oil. After a thorough flushing of the forks with solvent or gas the bottom caps (the threads should be
oiledl are re-tightened and 230 cc (7.2 fl. oz.) of fork oil is poured into each fork tube. The upper caps
are then re-installed and the upper pinch bolts are re-tightened. Much care shou ld be given to the forks,
for if the forks don't work properly, the rider cannot perform to the best of his ability.
Service - Front forks - After loosening the pinch bolts, both fork tubes should be taken out of the
triple clamps. The play in the steering head bearings should then be checked and adjusted. The individual
tubes are checked to seeif they are bent. The fork slider is slid up and down on the fork tube in an up
and down motion to seeif there is any binding on either the tube or the slider The fork tubes must also
be checked visually for scarsand scratches. The fork sealsshould be replaced if there is any leakage.
Petcocks
In the two petcocks are screens to prevent dirt from entering the float bowl. These screensmust be
cleaned regularly. Caution - Only large volume petcocks can be used for adequate fuel flow.
3.
AIR FILTER
Before each race the air filter should be checked and cleaned. A paper filter should be cleaned from the
inside out, using compressed air. The foam filter is washed in gasoline or solvent. Then, the foam filter
should be penetrated thoroughly with motor oil (SAE 201, and both ends of either filter smeared with
grease for sealing. Before re-installation of the filter, the inside of the air cleaner box should also be
cleaned. The rubber boot leading to the carburetor should be checked to seethat it is sealed properly.
-
4.
CLUTCH, PRIMARY CHAIN - GEAR BOX
The clutch is checked by actual operation. The
springs will eventually have to be replaced or the
clutch plates will be replaced if there is excessive
slippage. The clutch handlebar lever is adjusted
so that there is 2 to 3 mm play in it. (.080" to
.120"). The primary chain is checked for excess
play. The magnetic drain plug is cleaned every
time the oil is changed to see if any broken rol-
lers from the chain are attached. Replace any de-
fective parts immediately.
-
17. Clutch adjustment at the lever
5.
CYLINDER AND PISTON
The play between piston and cylinder wall should be checked with a feeler gauge. The same should be
done to the piston ring end gap to assuregood compression. A softened head gasket should be installed
and the cylinder head bolts tightened to 18 foot pounds.
6,
CRANK SHAFT
While the cylinder is not on the crankcases the play in the lower connecting rod bearing should be
checked.
7.
FRAME
The frames are free of maintenance. The steering head welds should be checked for cracks. If a crack is
discovered, the frame should be welded by a qualified welder. The steering head bearing races should be
inspected regularly for signs of rust or abrasions.
8.
TELESCOP FORKS - STEERING
Changing fork oil - The upper triple clamp pinch bolts (8 mm Allen) must be loosened, also remove the
air escape caps (36 mm). Next, the caps (27 mm) at the very bottom of the forks are loosened to remove
fork oil. After a thorough flushing of the forks with solvent or gas the bottom caps (the threads should be
oiledl are re-tightened and 230 cc (7.2 fl. oz.) of fork oil is poured into each fork tube. The upper caps
are then re-installed and the upper pinch bolts are re-tightened. Much care shou ld be given to the forks,
for if the forks don't work properly, the rider cannot perform to the best of his ability.
Service - Front forks - After loosening the pinch bolts, both fork tubes should be taken out of the
triple clamps. The play in the steering head bearings should then be checked and adjusted. The individual
tubes are checked to seeif they are bent. The fork slider is slid up and down on the fork tube in an up
and down motion to seeif there is any binding on either the tube or the slider The fork tubes must also
be checked visually for scarsand scratches. The fork sealsshould be replaced if there is any leakage.
Maico 72-74.5 Radial Manaual
www.maicowerk.com
Courtesy of [email protected]
