After my recent purchase of a tube frame G10 I was a bit disappointed in how it mowed. Surely this tractor has to mow better than this. Well I took the deck off(hate doing that) and low and be hold the blades were on BACKWORDS. How many years the PO had been doing this is anyone's guess. Now I'm dealing with a rich running engine. Sparkplug is black. Any ideas how to remedy this on a HH100 engine? Awaiting my next discovery.