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Starting And Operation - Yamaha TTR90(M) Owner's Service Manual

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STARTING AND OPERATION

CAUTION:
Prior to operating the machine, perform
steps listed in pre-operation check list.
WARNING
Never start your engine or let it run for any
length of time in a closed area. The exhaust
fumes are poisonous and can cause loss of
consciousness and death within a short
time. Always operate your machine in an
area with adequate ventilation.
STARTING A COLD ENGINE
WARNING
Before starting the engine, be sure to shift
the transmission into neutral.
1. Turn the fuel cock to "ON".
2. Operate the starter (choke) and com-
pletely close the throttle grip.
3. Slide the "ENGINE STOP" switch to the
"
".
4. Kick the kick starter with full strength to
start the engine.
5. After the engine starts, warm up for one
or two minutes. Make sure the stater
(choke) is returned to the original position
before riding.
STARTING A WARM ENGINE
To start a warm engine, refer to the "Starting a
cold engine" section. The starter (choke)
should not be used. The throttle should be
opened slightly.
CAUTION:
See "Break-in Section" prior to operating
engine for the first time.
STARTING AND OPERATION
WARMING UP
To get maximum engine life, always "warm-up"
the engine before starting off. Never acceler-
ate hard with a cold engine! To see whether or
not the engine is warm, see if it responds to
throttle normally with the stater (choke) turned
off.
WARNING
Before starting off, be sure to turn up or
remove the side stand.
Failure to retract the side stand completely
can result in a serious accident when you
try to turn a corner.
ENGINE BREAK-IN
1. Prior to starting, fill fuel tank with gasoline
2. Allow engine to warm up. Check engine
3. Operate machine in lower gears at mod-
4. Allow engine to cool. Repeat procedure,
5. Allow engine to cool. Repeat procedure,
6. Allow engine to cool. Remove top end and
7. Check entire unit for loose or misadjusted
8. Re-start engine and check through entire
CAUTION:
After the break-in period, check every fit-
ting and fastener for looseness.
If any loose is found, retighten it securely.
1 - 12
and oil tank with specified oil.
idling speed. Check operating controls
and engine stop switch operation.
erate throttle setting for 3 ~ 5 minutes.
Check spark plug condition.
running for 5 minutes. Very briefly, shift to
higher gears and check full throttle
response. Check spark plug condition.
running for 5 minutes. Full throttle and
higher gears may be used, but avoid sus-
tained full throttle operation. Check spark
plug condition.
inspect. Remove "high" spots on piston
with No.600 grit, wet sandpaper.
Clean, and carefully reassemble.
fittings/controls/fasteners.
operating range thoroughly. Stop. Check
spark plug condition. Re-start. After 10 ~
15 minutes operation, machine is ready
to ride.
GEN
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