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1.2 Carburetor adjustment
Basic information on the original carburetor setting
The original carburetor setting was adapted for an altitude of approx. 500 meters (1600 ft.) above sea level, and the ambient temperature of approx.
20° C (68° F), mainly for off-road use and central European premium-grade fuel (ROZ 95 MOZ). Mixing ratio 2-stroke motor oil : super fuel
1:40 – 1:60.
Basic information on a change of the carburetor setting
Always start out from the original carburetor setting. Essential requirements are a clean air filter system, air-tight exhaust system and an intact car-
buretor. Experience has shown that adjusting the main jet, the idling jet and the jet needle is sufficient and that changes of other parts of the car-
buretor will not greatly affect engine performance.
RULE OF THUMB: high altitude or high temperatures
➞
choose leaner carburetor adjustment
low altitude or low temperatures
➞
choose richer carburetor adjustment
WARNING
– O
NLY USE PREMIUM
-
GRADE GASOLINE
ROZ 95
MIXED WITH HIGH
-
GRADE TWO
-
STROKE ENGINE OIL
. O
THER TYPES OF GASOLINE CAN CAUSE ENGINE FAILURE
,
AND
USE OF SAME WILL VOID YOUR WARRANTY
.
– O
NLY USE HIGH
-
GRADE
2-
STROKE ENGINE OIL OF KNOWN BRANDS
.
– N
OT ENOUGH OIL OR LOW
-
GRADE OIL CAN CAUSE EROSION OF THE PISTON
. U
SING TOO MUCH OIL
,
THE ENGINE CAN START SMOKING AND FOUL THE SPARK PLUG
.
– I
N THE CASE OF A LEANER ADJUSTMENT OF THE CARBURETOR PROCEED CAUTIOUSLY
. A
LWAYS REDUCE THE JET SIZE IN STEPS OF ONE NUMBER TO AVOID
OVERHEATING AND PISTON SEIZURE
.
N
OTE
: I
F DESPITE A CHANGED ADJUSTMENT THE ENGINE DOES NOT RUN PROPERLY
,
LOOK FOR MECHANICAL FAULTS AND CHECK THE IGNITION SYSTEM
.
Basic information on carburetor wear
As a result of engine vibrations, throttle valve, jet needle, and needle jet are subjected to increased wear. This wear may cause carburetor malfun-
ction (e.g., overly rich mixture). Therefore, these parts should be replaced after 10000 kilometers (6000 miles).
1.1 Bleeding the cooling system
If the coolant has been drained, the cooling system must be bled as follows after
refilling.
– Make sure that the drain screw
1
is fastened.
– Pour approx. 0.5 litres coolant into the system.
– Remove the screw
2
on the right radiator and tilt the motorcycle to the right
approx. 30 degree angle.
– Now pour coolant into the system until it escapes from the right radiator free of
bubbles and replace the screw
2
immediately so that no more air may reach the
right radiator.
– Return the motorcycle to its original position and top up the left radiator until
the coolant can be seen approx. 10 mm above the radiator fins.
– Check the coolant level again after a short ride.
1
2
Содержание 250 1998
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