Engine Tuning - GGP Mountfield SV-150 Workshop Manual

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4.1 ENGINE TUNING AND TESTING
A) Operating guidelines
The instruction manual describes a series of opera-
tions for the client to ensure minimum basic main-
tenance. For operations beyond the client's capa-
bility, the Service Centre should see to keeping the
engine in perfect working order by:
– Tuning the engine whenever possible.
– Recommending the client a routine maintenance
program at set intervals (e.g. at the end of the
season or before a long period of inactivity).
B) Engine tuning program
Whenever the Service Centre is asked to service a
lawnmower or tune an engine, it should follow a
series of operations to ensure the engine is kept
fully serviceable.
Tuning should involve:
– external blowing and cleaning the cylinder head,
cylinder and muffler by removing any remains of
grass and mud;
– checking the oil level, topping up or replacing
parts if necessary;
– inspecting the condition of the starter cable and
checking that it functions correctly;
– cleaning and oiling the air filter
– emptying and cleaning the fuel tank and check-
ing the breather pipe
– adjusting minimum and maximum speeds
and 6.5];
– inspecting the condition of the spark plug and
ignition cable; checking the distance between the
electrodes [u
– tightening the screws
– functional test
Should the checks and adjustments fail to achieve
a satisfactory result, refer to chapter 5 for trou-
bleshooting.
WORKSHOP MANUAL
4.1.
ENGINE TUNING AND TESTING
[u 6.3];
[u 6.1];
6.6];
[u 6.9];
[u point "C"].
0
C) Functional test
A functional test needs to be carried out at the end
of each servicing operation, to check that the oper-
ations made are effective. The test must be per-
formed in compliance with the safety regulations
regarding the use of the lawnmower on which the
engine is installed.
The functional test is carried out as follows.
1. Refuelling and checking the supply system.
When you have refuelled the tank with new petrol,
check the seal of the tank, the cap and the carbu-
rettor pipe.
2. Cold start test. With the throttle control in
"CHOKE", start the engine a few times to check it
runs normally.
3. Check the engine rpm. When the engine is hot
enough, check the engine speed with the throttle
control set to "SLOW" and "FAST"; the readings
should be equal to the specifications
4. Hot start test. With the engine hot and the throt-
tle control set to "SLOW", start the engine a few
times to check it runs normally.
5. Engine brake and stopping test. If you release
the lawnmower brake lever, the engine should turn
off instantaneously and decisively, and the rotation
should stop within 3 seconds.
If all of these operations have a positive result, the
engine can be considered fully serviceable and be
returned to the client.
[u 6.4
SV 150
2004
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from to
1 / 1
page
[u 3.1.B].
01/2005