Snapper 1650 Series User Manual

CARBURETOR ADJUSTMENTS
Lack of power and black sooty exhaust
smoke usually indicates that fuel mixture is
too rich. An overrich mixture may also be
caused by a clogged air cleaner — check this
before readjusting carburetor. Fuel mixture
may be too lean if engine skips or backfires
at high speed.
SINGLE CYLINDER ENGINES
MAIN FUEL: For preliminary setting, turn
main fuel screw, in clockwise direction until
it bottoms lightly (do not force) then back out
two turns. With engine thoroughly warmed
up and running at full throttle and full load,
turn main fuel screw in until engine slows
(lean setting) then turn screw out until
engine regains speed and then starts to slow
down (overrich setting). Turn screw back in
until it is positioned halfway between lean
and overrich settings — when properly ad¬
justed engine will accelerate smoothly and
operate with steady governor action.
FIG. 6.1-CARBURETOR-SINGLE CYL.
1. Idle Fuel. 2. Idle Speed. 3. Main Fuel.
IDLE ADJUSTMENT: Rough idle is usually
caused by idle speed being set too low. Turn
idle speed screw, in clockwise direction to in¬
crease speed. If engine still idles poorly after
speed is increased, stop engine and turn idle
fuel screw all the way in (clockwise) until it
bottoms lightly (do not force screw), then
back out 1-1/4 turns. Restart engine and
check idle — turn needle in or out (1/4 turn
at a time) until smoothest idle is achieved.
Idle speed should be 2100-2300 rpm.
TWIN CYLINDER ENGINES
1. Stop engine, remove hood from Tractor
and turn both fuel mixture screws in until
they bottom (do not force).
2. Turn high speed mixture screw out two
turns and turn idle mixture screw out one
turn. This is an initial setting.
3. Start engine and run at full throttle (do
not exceed 3650 rpm), turn high speed mix¬
ture screw in until engine starts to slow
down. Then turn screw out slowly until
engine regains full speed. If adjusted proper¬
ly, engine should accelerate smoothly and
operate at a steady governor speed. If it
doesn't open adjustment screw slightly.
FIG. 6.2-CARBURETOR ADJ-TWO CYL.
1. Spark Plug. 2. Breaker Point Case.
3. Idle Mixture. 4. High Speed (Main) Fuel Mixture.
4. Operate engine at about 1200 rpm and
turn idle mixture screw in until engine slows
down (runs rough) then open screw until
engine runs smooth.
5. Reset idle speed to 1800-2000 rpm.
NOTE: If these adjustments do not correct
carburetor problems, carburetor should be
removed and overhauled.
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6.2

Snapper 1650 Series Specifications

General

Brand	Snapper
Model	1650 Series
Category	Lawn Mower
Language	English