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Intermittent bogging can be caused by a nozzle check valve that is sticking open and leaning out the low speed circuit but if that is the case, it should not idle normally, if at all when the valve is stuck. How's the idle and was the saw run with a gas containing alcohol? If that is a strato engine, it is normal for the H screw to be turned out by more than 2 turns, does the carb have 2 throats, one above the other?

[QUOTE="Old2stroke, post: 7636474, member: 141754"] Intermittent bogging can be caused by a nozzle check valve that is sticking open and leaning out the low speed circuit but if that is the case, it should not idle normally, if at all when the valve is stuck. How's the idle and was the saw run with a gas containing alcohol? If that is a strato engine, it is normal for the H screw to be turned out by more than 2 turns, does the carb have 2 throats, one above the other? [/QUOTE]

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