My BX2360 Kubota has always had a LOT of vibration when starting a stopping the engine. The dealership claimed it was "somewhat normal"... and never could improve or fix it. It recently started to lose power under load. I changed both fuel filters (the primary, under the tractor, was full of gunk), and it ran like a sewing machine and started and stopped much quicker and with less vibration. After 10-minutes of running great, it started choking again. Afer removing the mowing deck,(grrr) I could see the primary filter was full again! Grrr...
I surmised the tank had algae and gunk in it. Kubota wanted $400-600 to clean the tank and replace the filters, again!
I found AJX Perfect Fuel online and ordered a bottle. Upon arrival, I put 2-oz in the full 6.6-gal tank and allowed it to sit for about 60-hrs, It started with typical vibration and I let it run for about 10-minutes. The engine began to run noticably smoother within about 5-minutes. I ran the tractor 4-hrs today and it ran smoother than it has in years! And, it now starts and stops with 90% less vibration for the first time ever!! AJX is my new best friend! (Trying the gasoline version next.) THANK YOU!!