BradleyCastrolMaxima

Hey you said the air screw is out 2 turns which means you are getting too much air now. Mine is at about 1/3 a turn out to be a bit rich if you screw it back in to my setting or the factory half out then it should be a lot more rich. Just to make sure you are talking about the right screw if the air/fuel screw is near the air filter then it is the air screw which means the farther out it is the leaner it will be. If the screw is closer to the engine then it is the fuel screw which means the further out it is the richer it will be so just go from that mine ran lean and adjusting the air screw to 1/3 out and adjusting the idle to my climate then it is fine and my spark plug is really dark brown. I use 80% Maxima formula k2 with a 20% mix of Maxima castor927 just for the smell and my bike runs great, hardly any carbon, and I have yet to ever foul out a plug using that mix. I use Maxima for everything it is a great product. Except for my coolant I use Twin Air Ice Flow and that works amazing. I have a 2016 st300 and I love that thing to death. Good luck.

Yeah it actually isn’t a trials bike but if it was it looks pretty close to a montesa