
Engine Model:
RV150 and SV150
RV40, V35
Page
7 of 36 Mountfield150cc Selfhelp Guide 2011, Issue 1.0
3 Routine Engine Maintenance
Regular and careful maintenance is essential to preserve the original
performance and safety level of the engine. Always store the mower in a dry
place.
TESTING FOR A SPARK (this job requires 2 people)
1. Stand the machine on a firm surface and set the
height adjusters to the lowest setting for added
safety.
2. Remove the H.T. lead (1 in the diagram) – a
push/pull fit.
3. Unscrew the spark plug (2 in the diagram) with a
genuine spark plug spanner.
4. Fit the plug back into the end of the HT Cap and rest
it against the engine block (hold only the black
insulation lead).
5. The second person can now hold in the Operator
Presence Control (OPC) and pull the engine cord.
You should see a spark jump across the end of the
plug. NOTE: The blade will turn when doing this.
Engine: Spark Plug:
The spark plug gap for all
these Mountfield engines
should be 0.6 – 0.8mm or
0.03” (that is
30
/
1000
)
RV150, V35,
RV40
Champion: QJ19LM
SV150 (year
2006
Champion: J17LM or RJ19LM
(both screw-off cap, and the
cap needs to be screwed off
before fitting)
DRAINING FUEL:
We advise that the engine should be drained of fuel before storage for more than 30
days. One should only buy fuel in quantities that can be used up within a few weeks.
How to drain the fuel is explained in sub-section A of Section 4 Starting the Engine.
Alternatively, because these engines have a gravity-feed, the engine may be allowed
to run until it runs out of petrol.
Please dispose of old fuel and used engine oil in a manner that is compatible
with the environment
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