4. Check the spark plug – condition of electrodes and spark plug hue. Torque 26Nm.
5. Check the engine regulation.
Carburetor WB-37 has the opening (diameter circa 8 mm) closed up with the net,
which is located under the back lid and rubber petal. This is the additional fuel filter. On the
filter, especially in the first period of exploitation there could be some technological
contamination of the fuel system as well as gel deposits caused by poor fuel quality. The
easiest way to get rid of contaminations noticed during the check-up is to rinse it by means
of regular syringe with the stream of pure washing benzene or brake cleaning spray.
Reducing the fuel flow through a sieve could cause intermittent engine running,
lack of power. In some cases, this could lead to leaning of the mixture,
temperature growth and the engine seizure!
After first 10 hours:
1. All steps performed after first 5 hours.
Every 25 Hours:
The same activities performed after 10 hours plus:
1. Check the Spark plug condition – the electrode gap and the isolator’s hue.
2. Clean the carburetor (internal mesh filter).
3. Clean or replace the main fuel filter.
4. Check the tension of the transmission belt.
Every 50 hours or once a year:
The same as every 25 hours plus:
1. Replace the spark plug.
2. Replace the starter rope.
3. The starter’s check-up (clearing and lubrication).
4. Control the engine’s regulation.
5. Replace the transmission belt.
Every 100 hours:
The same activities as every 50 hours plus:
1. Remove carbon deposits from the combustion chamber.
2. Replace the head gasket.
3. Replace the piston with piston pin rings and needle bearing.
4. Check the condition of the shaft bearings and connecting rod bearings.
5. Replace the manual fuel pump.
6. Replace the rubber joint of suction murmurs silencer.
7. Replace the silencer rubber shock absorber.
8. Replace the spark plug pipe.
Every 200 hours.
The same activities as every 100 hours plus:
2016-06-22
