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Checking the emission valve and breather

Never run the engine with the emission valve or pipes disconnected from the engine. Read more

Checking and adjusting valves

Valve clearances are the small gaps between the tops of the valve stems and the part of the mechanism which presses on them to open the valves. Read more

Removing and grinding valves

Good engine performance depends on valve condition. Worn guides or stems and burned or badly seated valves allow gas to escape under compression, resulting in poor starting and loss of power. Read more

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