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Clutch drag, all engines will exhibit this to an extent. Put a car on axle stands and start the engine up, watch the wheels turn...
If it's excessive then the clutch needs adjusting.
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@Calum my clutch works perfect so I think it's fine do you think it's more present in 2 strokes because the lack of torque?
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@declan No.
As said all engines will drop as you will get some form of engine drag.
It could be worn clutch plates or work springs.
Idle at 2k is about right for a two stroke, the RPMs will drop, but not enough to cause it to stall.