Hi, I just uncorked my 650r and drilled out the exhaust, I installed 175 main jet,68s pilot jet,B53E needle(3rd clip),and new HRC boot the one that goes between the carb and head, xr only filter backing(support) and Uni filter. I turned the air screw 1 1/2 turns out from seated, I think it should be 2 1/2 turns out not sure thou. The problem I am having is when I started it today w/choke it ran a little high on the rpm`s, about 2000/2500 I turned the idle down to a reasonable rpm, When I turned off the choke completly it ran bad,stalls,rough idle,won`t run past 1/4-1/2 throttle with out coughing and stalling.. What do I do from here? it`s a new BRP 2 miles on my sow. even going down the road I can`t run past 1/4-1/2 throttle falls on it face....I am at sea level. next question If I can`t get this stock carb the work what other carn is better Edelbrock or a FCR 39MM or the 41MM carb? I see Barnumspro has the Edelbrock carb if I chose his carb would I still have to play with jetting? Thanks.