2-57
CARBURETOR TUNING
INSP
ADJ
Main jet selection chart
Spark plug color
Diagnosis
Remedy
Light tan or gray
Carburetors are tuned
properly.
Dry black or fluffy
deposits
Mixture is too rich.
Replace the main jet with the next smaller
size.
White or light gray
Mixture is too lean.
Replace the main jet with the next larger
size.
White or gray
insulator with small
black or grayish
brown spots and
electrodes having a
bluish-burnt
appearance
Mixture is too lean.
The piston is damaged or
seized.
Replace the piston and spark plug.
Tune the carburetors again. Begin with low-
speed tuning.
Melted electrodes
and possibly a
blistered insulator
Metallic deposits on
insulator
Mixture is too lean.
The spark plug melted.
Check the piston for holes or seizure.
Check the cooling system, gasoline octane
rating and ignition timing. After replacing
the spark plug with a colder type, tune the
carburetors again. Begin with low-speed
tuning.
Troubleshooting
Trouble
Diagnosis
Adjustment
Hard starting
Insufficient fuel
Add gasoline.
Excessive use of the
starter or choke
Return the starter lever to its seated posi-
tion so that the starter valve is fully closed.
Fuel passage is clogged or
frozen
S
Check and, if necessary, clean the fuel
tank air vent, the fuel filter and all of the
fuel passages.
S
Check and, if necessary, clean the
carburetor air vents, fuel passages and the
float valve.
S
Clean the float chamber of any ice or water.
Overflow
Adjust the fuel level.
Poor idling:
S
Poor performance
Improper idling speed
adjustment
Adjust the engine idle speed.
Refer to “Low speed tuning”.
at low speeds
P
l
ti
Damaged pilot screw
Replace the pilot screw.
S
Poor acceleration
S
Slow response to
Clogged bypass hole
Clean the bypass hole.
S
Slow res onse to
throttle
S
Engine tends to
stall
Clogged or loose pilot jet
S
Remove the pilot jet, clean it with
compressed air and then install it.
S
Make sure that the pilot jet is fully tightened.
stall
Air leaking into the
carburetor joint
Retighten the clamp screws on the
carburetor joints.
Defective starter valve seat
Clean or replace the starter valve seat.
Overflow
Adjust the fuel level.
Summary of Contents for RX10LTGTAX
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Page 982: ...SERVICE MANUAL MANUEL D ATELIER INSTRUKTIONSBOK ...
Page 1515: ...8 19 LIGHTING SYSTEM CIRCUIT DIAGRAM LIGHTING SYSTEM ELEC ...
Page 1527: ...8 25 SIGNAL SYSTEM ELEC SIGNAL SYSTEM CIRCUIT DIAGRAM ...
Page 1555: ...GRIP WARMER SYSTEM ELEC 8 37 HI LO GRIP WARMER SYSTEM CIRCUIT DIAGRAM ...
Page 1564: ...8 42 CARBURETOR HEATER SYSTEM ELEC HI LO B W L R CARBURETOR HEATER SYSTEM CIRCUIT DIAGRAM ...
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Page 1664: ...Yamaha Motor Canada Ltd 480 Gordon Baker Road Toronto ON M2H 3B4 ...