4 STROKES
ADJUSTING IDLE SPEED (450F SMR/SMM - ALL 530F)
Adjusting the idle speed strongly affects the engine start, i.e. an engine
with correct idle speed adjustment will be easier to start than an engine
with an incorrect idle speed adjustment.
Every TM Racing motorcycle comes with idle speed adjustment suitable
for the type of motorcycle and average weather conditions. This adjust-
ment can be varied when needed.
With the engine running, sufficiently warm and without touching the gas
grip, rotate knob (1) on the left side of the motorcycle. Rotate clockwise
to increase the idle speed or anticlockwise to decrease it.
Do not adjust the idle speed too low. If you have a rev counter never lower
the idle speed below 2000 rpm for 450 cc and below 1800 rpm for 530 cc
with engine warm.
WARNING
NEVER ADJUST THE MINIMUM IDLE SPEED WITH THE ENGINE OFF AS THE
ENGINE MAY NOT START.
FUEL PRESSURE (250Fi ALL - 450Fi ALL(A)
In these models fuel is injected into the engine under pressure at pre-
established amounts which depend on the pressure of the system. Any fuel
pressure variations involve significant variation of carburation. In case the
engine malfunctions, we recommend checking the fuel pressure circuit.
This operation can be performed, with the engine off, by placing a pres-
sure gauge between the male and female parts of the fuel fitting located
under the tank.
With the engine running, the pressure detected must be 300+/-5 KPa
(3 Bar). If the pressure value is different the entire pump unit probably
needs to be replaced.
BASIC INDICATIONS ON CARBURETTOR WEAR
(450F SMR/SMM - ALL 530F)
The gas valve, conical needle, sprayer (where available) and float needle
valve are highly subject to wear due to engine vibration. As a result, mal-
functions on the carburettor may be detected (i.e. enriched air-petrol mix).
These components should be checked at scheduled intervals.
4.3 ENGINE MAINTENANCE
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