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ENGINE EXPLODED 3-VIEW
4020
1035
4000
1033
1040
4030
3000
2055
2070
2080
3050
3060
3040
3030
3020
6
1010
5000
6000
1036
1036S
2040
2050
2053
2060S
2060
5030
2090
CARBURETOR EXPLODED 3-VIEW
3080
3070
3015
3014
3011
3010
BREAKING IN YOUR ENGINE.
THIS IS AN ABC ENGINE. IT WILL BE VERY TIGHT AT TOP
DEAD CENTER. THIS IS NORMAL. AFTER THE FIRST FEW
RUNS IT WILL LOOSEN UP SOMEWHAT BUT REMAIN
TIGHTER AT THE TOP WHEN COLD THROUGH ITS LIFE.
Your VMAX engine requires minimal break in time. We
strongly recommend the use of an engine test stand such as
the VMAR #VMA-ETS120 for the first running and break in of
your VMAX engine. You can do the first runs with your engine
installed in a model but it is not recommended.
We recommend breaking in the engine by running it at a very
rich setting for approximately 4 tanks of fuel. (32 oz)
1) Attach the muffler, muffler gasket & carburetor firmly to
your engine and carefully install a glow plug with washer into
the top of the engine and a suitable prop and spinner. See the
prop selection guide on the back page. Make sure the propeller
is firmly attached with the curved (usually printed as well)
surface facing forward. Use a wrench to tighten the propellor
nut & washer firmly.
2) Mount the engine on your test stand and connect the fuel
lines. Make sure the tank is the right size & that the fuel tank
horizontal center line is about 9mm (3/8") below the needle
valve as illustrated on page 8. Fill the tank with good quality
glow fuel. See Page 2 for oil and nitro recommendations.
3) See Figure 1 and install the high speed needle valve and
turn the high speed needle valve (black knurled knob on the
side opposite from the muffler) slowly clockwise until it seats
and you begin to feel resistance. Then back the needle valve
out about 2-3/4 turns.
4) Stop now and ensure that you are following all of the safety
instructions.
5) With the throttle fully open (throttle arm fully forward), place
your finger over the carb inlet. WIth your other hand turn the
engine over several times counter-clockwise (as viewed from
the front) until you see fuel flowing from the tank to the
carburetor.
6) Connect the glow plug ignitor and reduce the throttle to
about 1/4 open. "Prime" the engine by squirting a small
amount (10 drops or so) of fuel into the carburetor inlet.
7) Using an electric starter or chicken stick start the engine in a
counter-clockwise direction (as viewed from the front). Never
use your fingers to start the engine.
8) When the engine fires make sure the engine is pushing air
back away from the rear of the engine. If not, remove the glow
plug ignitor and firmly pinch the fuel line running to the
carburetor to stop the engine.
9) With the engine rotating counter-clockwise and pushing air
back away from the rear of the engine, leave the glow plug
ignitor in place. Advance the throttle to full and back out the
needle valve a bit more to ensure that the engine is running
at full throttle but gurgling and spewing lots of oil and fuel out
of the exhaust. This very rich running is essential for a
smooth trouble free break in.
10) Let the engine run for a minute or so and then stop it by
removing the glow plug heat and pinching the fuel line
connected to the carburetor.
BREAKING IN YOUR ENGINE continued
11) When the engine has cooled for 5 minutes of so, start it
again and turn the needle valve in 2-3 clicks to lean out the
mixture slightly The engine will run a bit more smoothly and
without as much excess fuel and oil coming out of the
muffler. Try to remove the glow plug ignitor and see if the
engine will continue to run on its own.
12) Repeat this process several times on the first tank, each
time running slightly longer and slightly leaner but never
running screaming fast and always with a gurgling sound and
a sloppy exhaust residue. Always let the engine cool between
runs.
13) Now fill up the tank and run the engine again without
leaning it out any more. Leave the needle valve rich with a
gurgling sloppy sound for now. Run for 2-3 minutes at a time
at first then gradually increase the run times to about 5
minutes each as you burn up 3-4 tanks of fuel.
14) After you have broken in the engine with 3-4 tanks of fuel,
set the idle stop screw so that the carb can just about but not
quite close. Loosen the idle stop screw, put a straight pin in
the carb barrel and rotate the barrel gently closed as far as
the pin will allow, then tighten the idle stop screw into
position. Do not adjust the low speed mixture at this time.
FIGURE 1 - CARBURETOR
High Speed
Needle Valve
(Clockwise =
Carburetor
Throttle
Side View
Leaner)
Air Inlet
Arm
Top View
Idle Stop Screw
Carburetor
Fuel Nipple
Low Speed Mixture Screw
(Clockwise = Leaner)
INSTALLING THE ENGINE INTO YOUR MODEL
1) Check that all bolts on your engine are tight using the allen
wrench supplied. Do not overtighten or you will strip the bolt
hole threads, just make sure that the bolts are firmly seated.
2) See your model instructions for information about fitting
the engine into the model. Install the muffler and a prop with
spinner onto the engine and loosely fit the engine into the
model. Confirm clearances around the muffler, carburetor
inlet, throttle arm, needle valve, glow plug and propeller with
spinner. Confirm that fuel lines can run from the fuel tank to
the carburetor and muffler pressure nipple without kinking.
3) Ensure that the horizontal center line of the fuel tank is
approximately 9mm (3/8 inch) below the needle valve. See
the illustration on page 8.
4) Depending on the mounting system provided with your
model, firmly mount the engine into your modell.
5) Connect the appropriate fuel lines to the engine carburetor
and muffler pressure nipple. Do not get them mixed up.
3
Throttle
Arm
(Forward =
Faster)
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