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I’ve got the same on the Duc when it’s hot at the moment. You have to stall it down with the clutch, then it’s fine. I suspect the pilot might be a touch lean. It’s annoying for sure!
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Hey might be preaching to the converted but the mixture screw is the opposite of the air screw on a two stroke carb. Out is more fuel. Just had a diddle with the Duc carbs and it seems happier now. There’s no right setting, but somewhere between half and one and a half turns out is probably good. Any more than that and the pilot jet size is size is likely a bit small (lean.)
Jung
@pdlouche
Turns out that GPX600R was the guy’s wife’s bike. It’s gone and I’ll probably never see it again. Sad bike noises.
Massive issues with the pumper carb on the DR. I think I messed up and damaged inside when trying to adjust the main jet needle. Idle hangs at 2k then drops to 1.5k on its own accord. Weird lean/airleak type hang, but not.
Pumpers are a bitch.