My bike idles fine, how ever, when its time to start moving, anything below 3k results in what sounds like its stalling.
Its alot more audible now with a cut air box. It gets that muffled flutter like its run out of fuel. before it comes good at around 3k.
It will free rev fine, but when you load it up, it doens't like it.
This to me doesn't sound normal. I thought cutting some holes might help the situation, but i think it has made it worse.
I know they are not meant to be ridden at low rpm, but it almost stalls if you try to open the throttle under 4k in any gear

Any ideas ?
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I'm no NSR expert, but is it fine with the choke on from cold? If so, could it be a bit lean on the pilots? Maybe check that either isn't blocked at all and maybe try tweaking the air screws in a little to richen it up at the bottom end. As a general rule though strokers don't tend to spend much time at all below 3k on the tach other than for a moment in first when pulling away (My TZR 3MA for exampkle doesn't even register revs below 3k - there are simply no numbers on the tach below '3') - and even then you'd tend to use the clutch to keep the revs up a little, so maybe it's just the way you are riding it if you're not that used to strokers? Maybe try giving it a few more revs when pulling off?

If it's genuinely a problem I'd certainly be starting by checking carb basics like blocked jets, unsynched slides etc.

Cheers

Wb

Starting can be an issue if it sits for more than 3 or 4 days. Usually full choke, one of 2 kicks, and it starts. Idles up wih the choke on.

Tried pulling the choke on a little to see if it fixed the problem. It accually made it worse. Made me think mabey its running rich. But once its warm and cleared, its not smokey at idle.

The air screws is the only thing i can think of. The carbs were rebuilt with the new motor. The mech might of possibly got them adj incorrectly ?

I will try to get them off and apart this week and check
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is it running on both cylinders.

when mine was running rough it wasn't obvious until you opened the throttle, at start up if your not familiar with the sound of the bike it can sound underpower. i would agree that if it is sparking on both cylinders then look to the carb and make sure you aren't drawing in too much air with the wrong jet.

Cheers guys

Will have to spend a day going over it making sure everything is functioning as it should, then start looking at possible jetting problems
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Winning isn't everything, but loosing isn't anything