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Hello BHQ in having some issues with my build at the end stages. To explain i have a YFZ/Banshee hybrid nearly complete. The Engine i bought off ebay and was rebuilt with new weisco pistons at stock bore & has coolhead. At first i put on a set of mikuni 28mm flatslide carbs but a riding buddy of mine convinced me to try a Trinity 2 into 1 as it is supposed to give alot of low end to the power band which is what i need for riding the timbers in the midwest. And it would also allows me to run my custom aluminum airbox without alot of extra modifications with a single boot from carb to airbox. I contacted Trinity who refered me to another guy must have been the original designer cant recall his name of hand. Anyways he advised me to start jetting with the following. My carb is a Keihin pwk 35 non airstriker. Jet Needle= DEJ clip in middle. Slow Jet= 45 Main Jet=190 Air/Fuel Screw 1.5 turns out Fuel mix would be 40:1 89 grade pump gas with AMS oil Interceptor. Bike starts up idles good. Has good throttle response. Seems to fall on its face in 3rd gear mid range.. I pulled the plugs and found one side seems to be rich with a black tinge and the other is light light brown/tan and wipes right off to a clean silver plug. Im baffled??? All electrical is brand new. CDI is an adjustable type which i have set on 4. What could be casuing this??