I've got an 1994 Worksite 6x4 with the Kawasaki 620D. The motor smokes real bad and it looses power on an uphill climb. I replaced the water pump and gaskets last year because there was water in my oil. Solved that problem but I've still got tons of smoke. Really, the mosquito's fear this thing. Of course as some of you have probably found out all the parts can only be purchased thru Deere for the small sum of your first born child. Question is, has anyone ever figured out a way to around that or is there a way around that? I'm wondering if I can just replace the rings and lash the valves and she'll be back to tugging like a draft horse again. The last four digits of the motor model # that designate it John Deere are AS11. Anyone every try parts from and AS10 or AS12?