Prop Selection
Using the correctly sized prop to fit your particular application is
very important. Please check the included prop guidelines to
match your engine with the correct size of prop. When breaking in
the engine, please use a recommended prop size, as listed on the
chart. To fit your particular application, start with the prop you
used for break-in, and then experiment with other prop sizes to
find the one that produces the desired results without overloading
the engine.
If you plan on using a spinner, make sure the cut-outs for the
blades are deep enough to prevent any contact between the spin-
ner and the prop blades. This will prevent any possibility of the
spinner cutting into the propeller blade and weakening it.
Glow Plug
Your MDS engine comes complete with a long reach glow plug
with idle bar. These plugs are designed for break-in only, and it’s
common for these plugs to burn out within several runs of the
engine. Their use should provide you with quick starts and a reli-
able idle during the break-in process. The stock break-in MDS glow
plug may be replaced with Hangar 9’s economy plug (HAN3005) or
2-cycle performance plug (HAN3000).
Do not dismantle the engine unnecessarily, as doing so can cause
damage to the precision fit parts, such as the piston and sleeve. If
it’s necessary to clean the interior of the engine (such as after a
crash), remove only the muffler, carburetor, cylinder head and
backplate. You should be able to clean all foreign matter from the
engine without disturbing the fit of the precision parts. Any further
disassembly could result in voiding the manufacturer’s warranty.
Periodically remove the muffler and inspect the piston through the
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MDS instruction manual 5x6.5 4/28/00 3:09 PM Page 12
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