Examination
Remove air filter.
Start the engine.
Grab the diaphragm from below with two fingers through the hole in the valve body.
Press on the accelerator (increase the number of revolutions). In this case, the diaphragm should move up.
At idle, press the diaphragm up. In this case, the number of revolutions should be significantly reduced.
If with an increase "gas" the diaphragm does not move and therefore the speed does not decrease, remove and clean the valve, replace if necessary.
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