1. Valves may only be lapped with fine-grained grinding paste. To rotate the valve, a rubber suction cup is installed on the valve disc. To avoid scratches on the seat surface, lapping should be done with uniform rotations with frequent valve lifts.
Attention! After lapping, carefully remove the grinding paste.
2. The quality of grinding is checked by the contact patch and fuel: install the valves freely, pour fuel into the combustion chamber. Fuel must not leak through the valve guide. Otherwise, continue lapping.
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