Have two 4010 gas mules at an extremely remote location in Alaska. 125 hours on each, tons of new spare parts and manual at hand, am super conscious of need to use clean fuel and store them with fuel stabilizer. Am running them on 100 Low Lead Aviation fuel which might be a problem, but since putting these UTV's in service it has been one sensor or throttle body failure after another. We put them away in the fall in good working order and return the following summer to have one or both of them not running and the DFI light on. Dealer flew a mechanic out year one and he swapped parts between them until one ran. Used that example for previous three years and now I am spending scores of frustrating hours and thousands of $ to buy EFI brains and waiting to swap those parts when they arrive, and it will be chance if they work. Story being told: Need a diagnostic tool to plug in and identify problem. Dealer 500 miles, two mountain ranges and two bush airplane flights away. Kawasaki will not sell us their diagnostic tool ("dealer only, $10k investment") Has anyone used an aftermarket diagnostic tool with definite effect and can they tell me which tool to buy? Thanks for help, Dan from Yantarni Salmon Camp.