Hey guys, doing the valve cover gaskets on my recently acquired 93 Shadow. 62,000 miles. All I can say is.... varnishpalooza. According to the thick pile of service records, it's had a steady diet of conventional and semi-syn. At this point, I'm grateful there's no sludge.
Nice Ride. I had a 91 Sundance with the Mitsu 3.0L and a 5 speed. There are some performance tricks that make that engine come alive. On mine the 1st thing was to crank the distributor to full advance...to the max limit on the slot on the distributor base. Its been so long ago but think it was counter clockwise. Went to junkyard and scrounged a throttle body from a Chrysler minivan with a 3.8L engine. The minivan TB is much larger. The Mitsu was choked way down given the comparative cc's of the engine. There will be interference to the mouth on the upper plenum and with that used a dremmel to hog it out and port matched. I went further in blending by drum sanding to area way up into the zip tube in the upper plenum. I used premium plug wires and plugs also. There are a few sites that can give more info. The oil burning issue was due to the junk heads from Mitsu that had incorrect valve guide machining allowing them to drop (with mileage) relieving the usefulness of the valve guide seal. As for the deposits in the valvetrain area I think it looks pretty darn good given the age of the vehicle. Can always use 1/2 quart of trans fluid as a detergent flush or Seafoam with the oil and drive for a couple hundred miles and change the oil.
