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dukeswift · December 9th, 2019, 02:43 PM

Edit: Wait you say the air/fuel screws can be closed but they are still plugged from the factory?

I'd drill out those idle air mixture screws and give them a good cleaning. 2k is going to start touching into your needle so your slow circuit is the problem and I'd say those air mixture screws are the culprit.
There's rubber O rings in there that will need replacing. I mangled one of them on installation and had an air leak once. Spent a few months chasing jetting and when I replaced that O ring everything was dandy again.

Also, did you start with fresh plugs?

December 9th, 2019, 02:43 PM	#2
dukeswift ninjette.org member Name: Kyle Location: Kansas city Join Date: Apr 2014 Motorcycle(s): 02 Aprilia RS70 97 Ninja 250 Posts: 53	Edit: Wait you say the air/fuel screws can be closed but they are still plugged from the factory? I'd drill out those idle air mixture screws and give them a good cleaning. 2k is going to start touching into your needle so your slow circuit is the problem and I'd say those air mixture screws are the culprit. There's rubber O rings in there that will need replacing. I mangled one of them on installation and had an air leak once. Spent a few months chasing jetting and when I replaced that O ring everything was dandy again. Also, did you start with fresh plugs?