Well my buddy gave me a 1200 Quietline with the original Kohler 12 on it. It had been sitting in his driveway uncovered for at least seven years but he swore it ran fine when he parked it and then his dad moved and gave him him...gasp... a John Deere. Anyway I got it home and opened things up (it was a major acorn storage facility for the resident squirrels). Put in fresh gas, clean oil, cranked it over w/o the sparkplug, restored the ignition system and spark plug and she fired right up. Quite a bit of smoke initially (I expected that after sitting for so long) and she settled down to a smooth idle w/ no smoke. I let her run for 10-15 minutes and took her for a drive around the house toward the pressure washer. Not soon after putting her in gear and letting off the clutch she lost power and started vibrating and bucking around. I immediately shut her down, restarted, again with a smooth idle. As soon as I put her in gear and attempted to drive the same thing happened. Scary vibrations, almost like the timing jumps. Any ideas on why? Could the grenade gears be seizing (no needle bearings in the oil pan)? I'm looking for what troublshooting to do first to minimize the amount of disassembly.
Thanks in advance,
Bob in RI