I received the proper kit from Dynojet and when I started to install it I noticed the stock airbox plenum was cracked and leaking and the spring that holds the filter in place was broken and the filter was just kind of rattling around. I decided to replace it with pods. I ordered a set of pod filters, not K&N, some other brand that was cheap. I decided to go with the instuctions for a stage 3 kit since I was using the pods and running a "high performance" 4 into 1 exhaust. I installed the 138 main jets, which is what the instructions called for, and set up the dynojet needles with the clip in the middle position, as per dynojet's instructions.
Fired the bike up and it would barely run above an idle. It seems the "high performance" exhaust wasn't so high performance after all. I pulled the baffle and it was obvious why, it was extremely restricted, I have seen lawn mower mufflers with more flow capacity. Out came the cutting torch and welder and I made a baffle out of a 10 inch piece of 2' O.D. (1 7/8" I.D.) exhaust pipe from the auto parts store. This worked much better, the bike breathes much better and actually seems quieter. But it still had a major mid range problem and at full throttle it would just flatten out and start missing.
Pulled the carbs off again and replaced the mains with the leaner 132s from the kit. This helped but not much. I pulled the carbs again and moved the clip down one notch on the needle in order to richen up the midrange. Again, this helped. I knew I was still too lean on the midrange but I wasn't certain which way to go on the mains. I put a piece of duct tape on each filter in order to block off about a quarter or third of the airflow. It ran worse at full throttle and high rpms, indicating that the mains were still too big.
The first rule when tinkering with carburretors is to only change one thing at a time. But I was getting tired of pulling the carbs so I decided to take a chance. I raised the needles another notch to richen up the mid range and replaced the main jets with the leaner stage 1 114s. Bingo! It now pulls smoothly from idle to wide open without a glitch.
The dynojet kits do work but they still take some experimenting sometimes to get things right.
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