WM, Workshop Manual, K650, K700, K950, K1250, 2001-06, Power ...
WM, Workshop Manual, K650, K700, K950, K1250, 2001-06, Power ...
WM, Workshop Manual, K650, K700, K950, K1250, 2001-06, Power ...
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5<br />
Cylinder and piston<br />
Check that the outlet hole in the valve is<br />
open, in similarity with the hole in the<br />
cylinder wall.<br />
Check that the outlet hole in the valve is<br />
open, in similarity with the hole in the<br />
cylinder wall.<br />
Clean if necessary.<br />
Compression test<br />
The engine will only achieve maximum power and perfect functioning if the mechanical<br />
components such as cylinder, piston, circlips, and gaskets, are in satisfactory condition.<br />
A simple way of checking the condition of the engine is to measure the pressure in the<br />
cylinder with a compression gauge when the engine is turned over with the starter.<br />
1. Run the engine warm for a few minutes.<br />
2. Replace the plug with the compression gauge. Make sure<br />
that it is tight between the cylinder and gauge.<br />
3. Move the stop switch to the stop position.<br />
531 03 16-86<br />
4. Firmly pull the engine over 5–6 times.<br />
5. Read off the pressure on the gauge. Release the pressure by pressing in the valve<br />
cone on the side of the gauge connection. Repeat this procedure twice and<br />
calculate a mean value from the tests.<br />
NOTE!<br />
If the engine has been disassembled it should be ”run in” first in order to achieve a<br />
correct result.<br />
Compression pressure<br />
Average value for new engine: <strong>K650</strong>, 700 = ca 150 psi, <strong>K950</strong> = app. 130 psi,<br />
<strong>K1250</strong> = app. 110 psi.<br />
Engine renovation is recommended if the pressure is more than 30 psi below the values<br />
specified above.<br />
If a low pressure value is obtained, repeat the test procedure after pouring a teaspoon<br />
of engine oil (SAE 30) in the cylinder through the plug hole. If the pressure increases<br />
it is very likely that the piston, circlips and cylinder are severely worn and need<br />
replacing.<br />
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