
Engine Model:
RV150 and SV150
RV40, V35
Page
14 of 36 Mountfield150cc Selfhelp Guide 2011, Issue 1.0
5 Very High Revs from the Engine
QUICK TROUBLESHOOTING GUIDE:
Problem: Likely Cause: Solution:
Engine revs
are very high,
the stone
guard flap is
blown up the
in the air off
the grassbox,
or the mower
is ‘running
away’ (on
self-propelled
models)
Throttle cable is impeding the
regulator mechanism
• Debris caught in the throttle
springs
• Damaged throttle regulator
linkage, or other unspecified
throttle problems
Check and re-align throttle
cable (see A)
• Remove debris (see B)
• Refer to an authorised
parts/service dealer
A: Re-aligning the throttle cable:
1. From the back of the mower come around
to the side on the right. The black plastic
cover (1) you can see on the side of the
engine is the air filter.
2. To the LEFT of the air filter there is a
vertical metal lever running up the side of
the engine (it can be felt if you put your
hand against the engine block and slide it
towards the back of the mower along the
side of the engine).
3. From BELOW the air filter there is a black
plastic covered cable (the throttle cable)
which runs back along the side of the
engine, across the back of the mower and
then up the handle to the throttle lever.
4. CHECK TO SEE IF THIS CABLE
RUBBING AGAINST THAT VERTICAL
The pencil in the picture above
is pointing to the vertical metal
lever (27) which is part of the
regulator mechanism
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