William Robison
Posts: 20269
Joined: 11/10/2002
From: Mary Esther, Florida, FL, USA
Status: offline
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Ranger:
If the compression is good and the bearings aren't noisy, don't take the engine apart.
If the compression is good and the bearings are noisy then don't pull the piston out of the cylinder when you take the cylinder off the case.
Bad compression and noisy bearings, then you have permission for a complete teardown.
Seeing the picture of your FA-120, it really can't be that old. It has not only the AAC cylinder, it also has the high tappet guides and the late type cast muffler just barely shows. I doubt it could be more than five years old, or around that at most.
It would not surprise me, if you showed the right side of the crank case above the mounting lug, to see "120S" in gold letters on a black background.
It's possible you're misjudging the engine. Remember the FA-120 is the runt of the litter when you get into the big blocks, it's the smallest of all, it's bigger siblings now go all the way to the FA-220, and even the FA-180 is not much bigger than the 120. So you might just be expecting more than it has to give.
Fuel burn: I see you have the intake stack on your engine. Adjusted properly you should get at least 13 minutes on a 16 ounce tank, and that's assuming full throttle the whole time. With "Average" power settings 16 ounces will give 20 minute flights. Truly, it's all in the carb adjustment.
Don't fret about the leakage from the push rod tube, you probably won't see any when you get the engine dialed in. I would suggest a close inspection of the carb and intake pipe, check carefully for any leakage there. Set the valves, my recommendation is set them both to 0.002" to get the best performance.
Then quit worrying, and fly the plane.
Bill.
_____________________________
Real Airplanes have Two Engines
AMA 25139 - More than 40 years.
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RE: Welcome to Club SAITO ! - 
