I have had great luck with cutting the heads to ad compression and torque.
The 185 cubs are rated at something like 16 hp compared to your 9.8 hp. The motors are really the same C-60 other then the pistons have a differnt part #. I have been told they are higher compression. This is what i was told the differance was on the cub website.
I also turned up the governor speed to what was listed above.
I have on "mine" cut .060 off the head and it runs great, you can fell the differance.
My dad cut .100 off his and it runs great also, clearance isn"t a issue tons of room.
We havn"t run into heating issues or fuel issues, this will be the third trouble free year for mine and second year for dads.
We live in Michigan so snow is a issue and this is ware we really see the added torque when plowing.
In the spring i disc sevral gardens whith the tractor as well as push dirt with it and i have to say that the head cut was a positive improvement .
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