Snapper 1650 - Servicing; Engine Tune-Up Components

SERVICING
This Section is concerned with procedures beyond normal maintenance and care. Most of these opera¬
tions require above average mechanical ability. It is recommended that these services be performed at least
annually. Such services are available, with trained personnel, at your Snapper Dealer.
CAUTION: Never operate engine in a poorly ventilated area. Carbon monoxide is odor¬
less, tasteless and deadly.
Never make adjustments on Tractor with engine running unless absolutely necessary. If necessary, ex¬
ercise extreme caution. Do not wear loose clothing that might become entangled in moving parts.
Fig. 22 — Breaker Point Adjustment
1. Implement Drive Clutch- 3. Fuel Pump
2. Breaker Point Case 4. Air Cleaner
Fig. 23 — Cylinder Head Torque Sequence
SPARK PLUG — FIG. 12
Remove plug and check its condition every 100
hours of operation or annually. If gapping is needed,
set at .035". Do not sandblast, wire brush or scrape
plug. If needed, replace plug with Champion RH 10.
BREAKER POINTS
The point cover is located on left front of engine.
Fig. 2l. Check and service at least every 100 hours
of operation or annually. If oxidized, oily or dirty,
clean with a coarse cloth. Do not use emery cloth
or sandpaper. Replace badly pitted or burned points.
To adjust, turn engine over by hand until points
are at maximum opening. Check gap with feeler
gauge. If gap is not .020”, loosen retaining screw
and shift plate until proper gap is obtained. Re¬
tighten screw, then recheck gap when points are
fully open. Replace condenser if necessary.
ENGINE CYLINDER
HEAD BOLTS
Within first 25 hours of operation, cylinder head
bolts must be retightened to 30 ft.-lbs. torque (with
engine at operating temperature). Follow sequence
shown in Fig. 23.
CARBURETOR ADJUSTMENT
— FIG. 24
A CAUTION: Do not touch muffler
while adjusting carburetor.
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 car¬
buretor. Fuel mixture may be too lean if engine
skips or backfires at high speed.
MAIN FUEL ADJUSTMENT
For preliminary setting, turn main fuel screw, No.
3, Fig. 24, in clockwise direction until it bottoms
lightly (do not force) then back out two turns. With
engine thoroughly warmed up and running at full
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