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To
set the "low end" on an air bleed carb, first screw out the adjustment screw 2 or 3 turns. Second, take a small sewing needle and insert the needle into hole in the carb body in front of the motor. Third, slowly and gently screw in the adjustment screw until it just touches the needle. Your done! |
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Does your engine run
for a few
seconds and
quit? Especially when you takeoff?
Check your
fuel and
pressure lines,
they may be reversed!
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Does
your engine quit as soon as you advance the throttle for take off? You've already been through the too lean or too rich drill? If the plumbing is OK then try
changing glow plugs.
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Does
your engine quit as soon as your plane leaves the
ground? The engine is probably too lean, but open the low
end 1/4 turn. But before you attempt another takeoff,
start
the engine and hold the plane straight up and at full throttle.
Runs fine, fly, slows down, still to lean, open the needle
valve
2 clicks. Repeat until the engine actual speeds up
just a little
when you hold the nose up.
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Is your engine running
backwards? Briefly hold your finger
over the exhaust port on the muffler. The engine will
slow
down, almost quit, (remove your finger), and the engine
will
begin running forward.
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Use a glow lighter equipped
with a meter that shows if the
glow
plug is working!
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Does your two stroke keep
throwing the prop? Check
for
a flooded engine.
Remove the glow plug,
cover the top of
the engine
with a rag or
your
hand
and spin
the prop with
your starter. Replace the glow plug and start as usual.
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Seal air leaks with Copper
Hi-Temp Permatex. Apply with a toothpick...remember "a little dab will do ya".
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Using lighter fluid to start
your engine in cold weather? Put a
little after
run oil in the lighter fluid container. It will help reduce
wear
on your engine,
since
there is no lubrication in lighter
fluid.
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Moving from a three to a two
bladed propeller? Check the size
and pitch of
the original propeller, add 1" to the length and 2 to the pitch of the proposed replacement prop. A 10X6 three
blade =
11X8 2 blade)
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Engine
running lean no matter how much you open the needle valve? Check the fuel lines for kinks, first.
Then remove all fuel lines from the engine and attach an extra piece of fuel tubing to the needle valve inlet. Either
hit with a blast of compressed air or blow into the tube. More than likely
there's
debris in the needle valve seat. (If this doesn't have any effect, then the fuel tank needs to be removed and checked for blockage).
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For more engine tips from the
aircraft Proving Grounds click
here |
ENGINES
