Robert, in regards to the GT19.9, I was thinking yesterday, I have a "spare" SS16 motor in my basement that I took off a tractor this summer, runs good, but I borrowed the exhaust off it for my GT18- I may consider swapping you the onan for the Tec I gave you now that I have 2 more tecumseh tractors. I can't remember if the wiring for the Onan is still in that chassis, but it would give you one powerful motor tractor for snowblowing or plowing, and if I can walk you through the flaws of Onans, you can keep it running easily... I tried selling the motor a couple times to people who wanted parts for it, but no one wanted to pay what I was asking. I know that orange motor ran good but may need a head gasket, but think about it. I'm not 100% sure I want to do the swap, but I have 3 onans on my bench in the basement, and 3 onan tractors- I don't need a spare for all three of my tractors...