Those of you that know me may remember my experiences last year with various jet kits and jetting. Basically and without any details, I tried both the Factory jet kit and the Dynojet jet kit. I didn't care for either one and ended up using the stock needles with 2 shims on each and the main jets at 178/180 with the idle screws 2.5 turns out. The bike at that time had the Yoshimura RS-3 oval cans with the competition baffles. HP at that time was 104hp uncorrected and 102hp corrected for ambient conditions. Unfortunately I don't have the torque figures. Sorry! Anyway, the bike felt good and strong, but was a bit loud. I've recently changed the Yosh cans to high-mount MAXX in carbon fiber, and wanted to see what the differences were on a dyno. The carb settings were unchanged.

Seat of the pants feel seemed a little weaker in the mid-range and slightly better on top. Dyno run #1 is a fifth gear roll-on and shows the HP and Torque graphs. HP is up to 102hp corrected and torque is 66ftlbs at about 4,000rpm. Both curves are a little bumpy but torque is above 60 ftlbs. from 3200rpm all the way to 8900rpm. Dyno run #2 is the run up through the gears and gives a better indication of mixture balance. Note on run #2 the wiggly line connecting the peaks. Ideally, these should be almost flat. Note the first 2 are rising sharply while the last 2 are dropping sharply. This is an indication of a slightly lean mid-range and slightly rich top end.

Having nothing better to do this evening, I decided to try to correct the jetting as indicated by the dyno operator and as shown on the graphs. I added a third shim to each needle to richen the mid-range, changed the main jets to 175 front and 178 rear (same as stock) to lean out the top-end and mixture screws at 1.75 turns out. WOW! What a difference. I haven't dynoed it yet, but it's obviously better. I've never had a bike react this well to such a slight change. It revs much quicker than before, hitting the rev limiter before I'm expecting it. It will carry the front wheel slightly off the road all the way to redline without any dip in power. I tried to do a small wheelie at a familiar spot but it spun the rear tire instead! Never had that happen before. Steady cruising on the open road is much smoother with less engine vibration. There is no popping on deceleration, just a pleasant burbling. For this bike, this seems the perfect combination.

Happy Riding!