i'v got an 843, yr model 1983 with the perkins 4.154 engine in it ...well actually it's the third engine. the clock stopped working about 10 or 15 yrs ago with about 6000 hrs on it so there is no telling how many hrs on the machine total. i traded the machine to my brother about 2 months ago and he let someone use it and.... they ran it hot and cracked the head. does any body know where to get a head for this machine, that 4.154 was in a lot of applacations in the 80's but they discontinued it and parts are hard to find.