Throttle Maintenance; Cable Junction Maintenance - Yamaha QT 50F Service Manual

- W A R N I IMG:
Cable routing is very important, for de-
tails of cable routing, see the cable rout-
ing diagrams at the end of the manual.
Improperly routed, assembled, lubri-
cated or adjusted cables may render the
vehicle unsafe for operation.
1. Remove the cable.
2. Check for free movement of cable with-
in its housing. If movement is obstruct-
ed, check for fraying or kinking of cable
strands. If damage is evident replace
the cabe assembly.
3. To lubricate cable, hold in vertical posi-
tion. Apply lubricant to uppermost end
of cable. Leave in vertical position until
lubricant appears at bottom. Allow ex-
cess to drain and re-install.
NOTE:
Use Yamaha Chain and Cable Lube.
B. Throttle Maintenance
1. Remove Phillips head screws from
throttle housing assembly and separate
two halves of housing.
2. Disconnect cable end from throttle grip
assembly and remove grip assembly.
3. Wash all parts in mild solvent and check
contact surfaces for burrs or other
damage. (Also clean and inspect right-
hand end of handlebar.)
4. Lubricate contact surfaces with light
coat of lithium soap base grease and
reassemble.
NOTE:
Tighten housing screws evenly to maintain
an even gap between the two halves.
5. Check for smooth throttle operation and
quick spring return when released and
make certain that housing does not
rotate on handlebar.
C. Cable Junction Maintenance
The throttle cable cylinder (junction point for
Autolube control cable) must be periodically
maintained.
1. Remove throttle cable (1) from handle-
bar housing.
2. Remove throttle cable (2) from carbure-
tor mixing chamber top.
3. Remove Autolube pump cable from
pump pulley. Remove cable adjuster.
4. Remove the cable/Cylinder assembly.
5. Remove cylinder cap, throttle cable (2)
and Autolube pump cable.
6. Wash assembly thoroughly in kerosene.
7. Lubricate all cables.
8. Apply a thin coating of lubricant to
cylinder walls.
MOTE:
A small amount of lithium soap base grease
may be used in lieu of cable lubricant. How-
ever, if machine is to be used in extreme
cold, use cable lubricant.
9. Reassemble all cables. Seal cylinder to
keep from damage due to adverse wea-
ther an riding conditions. Reinstall
cables using CABLE ROUTING DIA-
GRAMS in back of book. See Mecha-
nical Adjustments chapter for correct
cable djustment.
1. Throttle cable 1
2. Throttle cable 2
3. Pump wire
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