Ok. Started taking off the old Keihin. Found my compressed air and contact cleaner and proceeded to work on opening fully blocked main jet. I’m talking no see through em blocked. Once unblocked I thought I’m pretty sure this little tractor would start. https://photos.app.goo.gl/XBNeEgmpq12xUkCU9 after a few kicks got it fired right up. It runs great...bog when you whack the throttle but that happens with any non accelerator pump carb. If only keihin made a 20-24mm fcrmx. Bob is probably right in that my keihin is wrong sized but how’s that old song go - you gotta love the one you’re with. What to do with my brand new carb.., So apart from clean fuel and not 5 year old pump piss, is there a decent fuel system cleaner I could add to my massive fuel tank to thoroughly clean the carb as it runs? Bob - what is the oil change procedure on these 110 nice motors ? How much do I tip in?