My Saito FA 120 D case fat head the exhaust exits out the side. The ABC series has two different rear bearing my D case has the small size rear bearing only way to get them replaced was Boca bearings in Florida. Right now I am waiting for the plastic cylinder retainer pin inserts.also the valve tube seals are out of production so I will use heat shrink. My engine was used and given to me. I feared the cam gear was damaged,frozen engine, but it was the bearing full of rust. I figured it was sat after use and no after run oil was applied. I use Dextron ATF a quart is 4.00 maybe more now. My quart has lasted me about 10 years. My exhaust is copper and my carb was also frozen Heating the engine was a must to take it apart. And used my sonic cleaner with 88 degreaser additive. Ran it thru three cycles of thirty minutes each. Really came clean used alcohaul to neutralize the 88 degreaser, then three in one oil to protect while waiting on replacement parts. AJ