Engine A (mm/in) B (mm/in) C(mm/in) D(mm/in) E(mm/in) F (mm/in)
PRO-36 53.0 / 2.09 75.3 / 2.96 59.5 / 2.34 15.0 / 0.59 38.0 / 1.49
PRO-40 60.3 / 2.37 86.3 / 3.39 69.0 / 2.72 17.5 / 0.69 42.0 / 1.65
PRO-46 60.3 / 2.37 69.7 / 2.74 17.5 / 0.69 42.0 / 1.65
PRO-61 67.0 / 2.64 104.8 / 4.13 83.0 / 3.27 25.0 / 0.98 52.0 / 2.05
PRO-91
74.5 / 2.93
84.9 / 3.34
84.9 / 3.34
94.9 / 3.72
94.9 / 3.72 67.0 / 2.64 105.6 / 4.16 83.8 / 3.3 25.0 / 0.98 52.0 / 2.05
PRO-120 106.2 / 4.18 74.4 / 2.93 117.5 / 4.63 93.0 / 3.66 30.0 / 1.18 59.0 / 2.32
PRO-120-RP 117.2 / 4.61 74.4 / 2.93 117.5 / 4.63 93.0 /3.66 30.0 / 1.18 59.0 / 2.32
■Dimensions
■Engine
Mount your engine securely to rigid hardwood rails (e.g.
maple) or a radi-al mount of metal or glass-filled nylon
composition. The top surfaces of the motor mount must be
absolutely flat and parallel to avoid crankcase distortion and
stress. Be sure to use only the highest quality mounting
hardware (such as hard-ened steel screws, steel hex nuts,
steel lock washers, etc.).
In order to reduce engine noise, flexible motor mounts can
also be used, although you should expect a very slight
decrease in performance of 100-200 R.P.M. at full throttle.
■Radio Set-Up
Set-up your throttle servo linkage to the carb
throttle arm so it provides the action indicated
when the transmitter throttle stick is moved.
■Fuel Tank
The fuel tank should be located as close to the
engine as possible. Ideally the centerline of the
tank should be level with the carburetor spray bar/needle valve assembly. The design of your
particular aircraft will determine actual tank location, but use the above instruction as a guide.
Keep in mind that tank location can have a large impact on engine performance. Make sure that
your entire fuel tank system is sealed and well constructed to eliminate the possibility of fuel or air
leakage. If possible, wrap your fuel tank with high quality foam rubber to reduce fuel foaming due
to airframe vibration.
■Muffler/Silencer
After the engine is mounted onto your model, secure the muffler to the engine with the
supplied bolts and lock washers. Be sure to tighten them firmly. The rear half of the muffler
can be rotated to direct the exhaust residue away. Check these two bolts and the long bolt that
travels the length of the muffler on a regular basis. Tighten them when necessary.
■Fuel and Pressure Lines
After installing the engine, use knife or razor blade to cut the silicone tube to proper length for use
as fuel and pressure lines. Then connect the fuel tank fill line to the carburetor and the fuel tank
vent line to the pressure fitting on your muffler. Do not use any other tools to cut
Installation
4 5
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