begin leaning the high-speed needle a few clicks at a time for best
performance, keeping in mind that a too lean setting at any time
can damage the ring and cylinder.
ABC Engine Break-In
Breaking-in your ABC engine requires the same basic procedure as
with the Ringed engine, except for a couple of minor differences.
The first couple of runs should be at a slightly rich setting, close to
normal operating temperatures. Heat helps the piston seat in the
liner. Also, the time involved is shorter; most ABC engines can be
fully broken-in within 3 or 4 flights at a slightly rich setting.
Step 2A. Muffler Mounting
Remove the muffler from the plastic bag. The muffler mounting
bolts are located in the tool set, as are the tools to mount
the muffler.
Step 2B. Fuel Tank Placement
The location of the fuel tank can greatly affect the operation of
any engine. Whether mounting the engine on a test stand or in
your model, we suggest that you position the tank as close to the
engine as possible. The center line of the fuel tank should be as
close to level with the engine flange mounts as possible
(See diagram on next page).
6
MDS instruction manual 5x6.5 4/28/00 3:09 PM Page 6
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