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you can verify your carb suspicion by switching the right and left carbs, but yes we just had a brand new Amal 930 that we couldn't get to run right, we started changing everything, re-jeted it, change the slide, change the float and bowl. finally we put a used carb on it and it ran better. so I took the needle jet out of the new carb and put the one from the old carb it it and it runs great. when you look at it you can't see any difference but it sure runs better now.
Needle jets are widely overlooked when looking for carb problems. cost me 2 hours labor, Big mistake to assume if it's new it's good.
 
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