I got the procycle jet kit a few days ago and tore down my carb to clean/inspect and install. My bike has the two brothers muffler(love that bark) and unplugged fuel mix screw from PO. I found the mix screw to be about 3 3/4 turns out and all else was stock in the carb and airbox aside from twin air I installed a while ago. There was nothing really to complain about with how the engine was running except a crack at the choke fitting which was probably the cause of hard starts. I made sure to get the warp 9 piece in my order.
Step drill and leatherman saw took care of the airbox top.
airbox cutout.jpg [ 76.35 KiB | Viewed 280 times ]
I followed the procycle directions and drilled the slide, set needle to 4th clip, 150 mikuni main and idle screw 2 turns out. A little choke got it fired up and I had to play with the idle stop because I had taken it out for cleaning but after that I took off for my favorite loop around a reservoir. Right away I could feel the difference in how much more air it was pulling in and the decel popping was much less than before. The roads I was on were too hilly and slow to do a good 4th gear WOT test but I tried anyway and it was a blast. It pulls better at all rpms and very smooth but I felt something like hitting the pipe on a 2 stroke that makes me think maybe the needle is too lean around 3/4 throttle and it surges?
This is my first 4 stroke bike so I don't know what to expect. I wonder if the carb vent is too close to the open airbox now.
I ran out of road before trying 5th so there is more tuning to be done but overall I am happy with the improvements. I fiddled with the idle screw and it seems to like it staying at 2 turns out, about 1400rpm according to my vapor. Running temp also dropped from 280F before down to 255F...anyone seen that?