Dial-A-Jet Kit DJ-103
Thunder Products Dial-A-Jet Kit for Kawasaki KZ650 thru KZ1000 4 cylinder motorcycles. New, in unused, uninstalled condition, with instruction manual.
Price from manufacturer is $259.00
What it does: Dial-A-Jet feeds a fine consistent mist of emulsified fuel instead of raw liquid fuel like all other jetting circuits in your carb. It’s the easiest and fastest way to “tune-in” any modifications you have performed on your machine.
Question: Do these work?
The answer: Yes, and here's why. If you have a bike set up with the perfect jet settings, irt will run perfectly within a range of temperatures and density altitudes around the baseline tune. If, like we experience in the northern Midwest, temperatures swing from a riding conditions low of 40 degrees, to a high of 105 degrees, and density altitude can swing as much as 3000 feet based on temp, dew point, and barometric pressure, you will have days when the engine is running very rich and others when it is lean. This is why racers constantly tune their cars at events. to optimize performance as conditions change... drag racers are obsessive about it, as a small change can have a significant impact.
Small carburetors on small displacement motorcycle engines suffer more from this than big carbs on big engines. The Dial-A-Jet responds to actual air density and engine responsive pulses, to start with a slightly lean mixture, and adjust constantly for the air density differences the engine is experiencing, which expands the range of the original tune significantly. This is an old concept that has proven to work for more than 40 years.
Do You Need It? While one can argue that bikes are run every day on fixed jets, with no serious issues, it can also be argued that therr is a great deal of enjoyment to be realized from modifying and chasing performance improvements that make a machine run better. Nobody needs most of what we own, but we want it. So, while you can live without this mod, and don't necessarily need it... you might sill want it just the same.
I intended to install this on a bike project... just did not find the time, and have since sold the machine.