All small bore engine (850-1098) have 1" exhaust valves. If you have many experience with these engines then you know that they are prone to burning exhaust valves. Unleaded fuel makes that situation worse. Hard stainless steel valves live longer without the lubrication of the lead in the gas. The head design will also improve performance. These valves use the square groove keepers.
All small bore engine (850-1098) have 1" exhaust valves. If you have many experience with these engines then you know that they are prone to burning exhaust valves. Unleaded fuel makes that situation worse. Hard stainless steel valves live longer without the lubrication of the lead in the gas. The head design will also improve performance. These valves use the square groove keepers.
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