6
The SuperTigre .34
Parts of the engine:
A. Crankcase D. Muffl er
B. Cylinder Head E. Carburetor
C. Glow Plug
Parts of the carburetor:
1. Body 5. Throttle arm
2. HSN (Needle) 6. Fuel Nipple
3. LSN (Idle Needle) 7. Idle speed adjustment screw
4. Spray bar
Your carburetor has been set from the factory but differences
in altitude, temperature and type of fuel can have an effect
on the factory setting. The factory carburetor settings for your
SuperTigre .34 are:
• HSN (#2): 1-1/2 Turns out
• LSN (#3): 5 Turns out
• Spray bar (#4): Fuel nipple aligned with lowest cooling fi n
on the engine (20° counterclockwise)
The above setting should get you going but should be
considered a starting point and might not be the over all best
setting for your motor. If you are having troubles starting your
motor you might want to revert back to the factory settings
and start over.
UNDERSTANDING & ADJUSTING YOUR CARBURETOR:
The SuperTigre carburetor has two main adjustments and
one sub adjustment. The two main adjustments are the HSN
(High Speed Needle) and the LSN (Low Speed Needle). The
sub-adjustment is the Spray Bar.
Turning or what we call “tuning” your HSN adjusts the amount
of fuel entering the motor during high speed operation (the
mixture). The LSN adjusts the fuel mixture during idle and
the spray bar adjusts the mixture during the transition from
idle to full speed operation. The more you turn in (lean out)
either the HSN or the LSN, the less fuel there is entering the
engine. This in turn makes the most power but can cause
a condition called “a lean run”. A lean run can damage
your engine so always adjust your engine on the rich side.
When properly adjusted, the Spay Bar allow the engine to
accelerate with very little hesitation.
The idle speed adjustment screw is located on the top of the
carburetor body. Turning this clockwise allows a faster idle
setting; turning it counter clockwise lowers the idle speed.
LISTEN TO YOUR MOTOR:
As you adjust your engine you are going to want to listen for
what we call the 4-cycle/2-cycle break. The 4-cycle/2-cycle
break is a point when your engine goes from a slower speed
crackling sound to a smooth running, high pitch sound. It’s
not hard to hear this and you will know when you have found
it: your motor will start making a lot of power.
OPTIMUM ENGINE SETTINGS:
HSN: Your engine will last the longest and make the best
power if you tune and operate your engine to just over the
point of the 4-cycle/2-cycle break. You need to make sure
you have it rich enough so you do not have a lean run and
risk damaging the motor. If you’re in doubt as you start your
new engine, err on the rich side.
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(8 pages)
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