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Canal des Hollandais
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Cales control valve clearance (0.05 to 1mm) 19.97EUR
Cales control valve clearance (0.05 to 1mm)
Click to enlarge

The valve clearance is the interval left free between the rocker arm and the valve head.
It allows the latter to not be in constant contact with the rocker arm and thus avoiding harmful to wear contact operation between rocker and valve.

If the game is too important a rattling noise will appear.
It causes no damage to the engine start.
By cons, if the game is too small, no noise is noticeable but the engine will suffer more in fact, too close contact between the rocker and the valve may retain it, and prevent the valve well back in the closed position against the seat in the cylinder head.
This will eventually "burn a valve", ie hot gases that run between the valve and its seat, causing a diminution of the seal.

In other words, a decrease in engine performance and at worst severe damage if you let the situation get worse.

For Pit bike engine the game is between 0.05 and 0.07mm
The engine must be cold.
Remove the spark plug.
Disassemble the valve access caps on the head.
Dismantle the flywheel cover on the left side.
Turn the engine anticlockwise, so as to bring the piston to TDC compression. This is the position in which the piston is the highest in the cylinder and in which both valves are fully closed.

Be careful not to confuse the compression TDC (valves closed) with TDC exhaust. In the latter case, the piston is at the top of the cylinder, but the exhaust valve is opened so that the burnt gases escape.
A final confirmation that you have positioned the crankshaft to bring the piston to TDC compression is given by the fact that the rocker valves do not move when you turn the engine slightly back and forth.

Select the wedge 0.05 mm: it must pass directly between the head of the valve and rocker arm.

Select shim 0.10 mm: it must not pass between the valve head and rocker arm.

Setting: Use the tool kit reference 871
Loosen the nut against the adjusting screw. Do not remove.
Then act gently with pliers to tighten or loosen the adjusting screw rocker.
By screwing, you reduce the game and unscrewing will increase the game
Once the proper clearance obtained, tighten the nut against.

Check one last time in. If the value is not between 0.05 and 0.07, repeat the procedure.

Proceed by screwing or unscrewing very small (quarter turns or knockout rounds), then recheck the game with shims.



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