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Why do 4s start easier when hot in neutral?
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[QUOTE="Rich Rohrich, post: 807812, member: 16241"] Four-strokes have a short intake tract that leads directly into the cylinder when the intake valve is open. Two-stokes only have their reeds open when the engine is running, so when it's stalled the reeds are shut effectively closing off the conduit between the carb and the engine. You also have the carb connected to the crankcase rather than directly to the cylinder so it will be mpore tolerant of excess fuel. You have more static drag in a four-stroke. You are turning the cam chain, which has to overcome the valve spring pressure and the additional mass of the crank . Add in the drag from the clutch and you have a lot to turn. Getting it to spin at a high enough speed to light with the kickstarter is tough unless you reduce some of the drag and putting it in neutral is the easiest way. [/QUOTE]
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Why do 4s start easier when hot in neutral?
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