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Audio comfort level

Polaris ATV hauling boxes with Lucy looking onward

Two things I like about the Polaris 700 Sportsman are related to the engine.

The first is an engine brake. As you let off the gas some sort of braking gizmo in the engine brings the ATV to a full stop. I barely need to use the regular brakes anymore, but what I like most is the increased safety. Sometimes Lucy wants to stop in front of me for a quick smell check where she pauses and puts her nose in the air. The engine brake decreases stopping distance by a considerable amount.

Engine noise is the next thing I like compared to the 400 Polaris. I guess I prefer a more deep, throaty engine to the 2 cycle whine that sounds too much like a chainsaw for my audio comfort level.

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While I don't know enough about the sportsman to say that there isn't a special gizmo in the engine, I somewhat doubt it.

The thing is that 4-stroke by their nature have much more engine braking than a two stroke.

A four stroke in general has more moving parts (balancing shaft, valvetrain) than a two stroke. And in contrast to a 2-stroke it only has one power stroke in two revolutions of the crankshaft, instead of a power stroke in every revolution.

This is the reason why a 2-stroke will generally produce more power than a 4-stroke engine of the same capacity.

Modern 4-stroke engines (with EFI) will cut the fuel flow to the engine completely when you're engine braking. Two strokes that use pre-mix cannot do that because this would also starve the engine of oil.

Comment by Roland_Smith Fri Aug 23 20:09:07 2013

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