Simplicity 759 3415H - Starter-Generator Belt Adjustment; Carburetor Adjustment

Figure 17. Generator located on right side of engine.
STARTER-GENERATOR BELT ADJUSTMENT
See figure 17. If the starter turns, but the engine does not ro¬
tate, the starter generator belt may need tightening. Proceed
as follows:
1. Raise the tractor hood as explained on page 10 under
raising the tractor hood.
2. See figure 17. Loosen slightly the two nuts (A) cap screw
(B) and nut (C). Use a pry bar similar to the one shown be¬
tween the generator and engine block to apply pressure to
the generator and tighten the belt. The belt should be tight
enough so thumb pressure at (E) will deflect it about 1/4".
3. While holding the pry bar to maintain tendon on the belt,
tighten the mounting bracket at {C) securely.
4. Actuate the starter to make sure the engine will rotate. If
it does not, loosen the nut at (0) and apply more tension to
the belt.
5. Tighten the two nuts at (A) and the cap screw (B) se¬
curely.
6. Lower the hood and lock it in place.
CARBURETOR ADJUSTMENT
The carburetor is adjusted at the factory and normally does
not need adjustment unless it has been disassembled or tam¬
pered with.
Figure IS. Carburetor adjustments.
INITIAL ADJUSTMENT: Initial adjustment will per¬
mit'the engine to be started and warmed up prior to final
adjustment. Proceed as follows:
1. See figure IS. Turn the needle valve (A) clockwise until
it just doses. CAUTION: VALVE MAY SE DAMAGED
BY TURNING IT IN TOO FAR.
2. Open the needle valve (A) one and one half turns counter*
clockwise.
3. Turn the idle valve (B) clockwise until it just closes-
4. Open idle valve (B) one half to three quarter turns.
FINAL ADJUSTMENT
1. See figure 30. Move the transmission shift lever to the
NEUTRAL position, so the tractor will not creep forward
or back when the engine is running.
2. Start the engine and run it at full speed.
3. See figure IS. Turn needle valve (A) clockwise until en¬
gine misses, {Lean mixture), then turn it out (counter¬
clockwise) past the smooth operating point, until the engine
runs unevenly (Rich mixture). Now turn needle valve (A) to
the mid-point between the rich and lean mixture so the en¬
gine runs smoothly.
4. Move the engine speed control lever to the slow position,
and set the idle speed adjusting screw fC) so a fast idle is ob¬
tained (1200 RPM). Hold the throttle in this idle position
and turn the idle valve (B) clockwise (lean) and counter-
closkwise (rich) until tbe engine idles smoothly.
5. Reset the idle speed so tbe engine idles at 1200 RPM.
Push the engine speed control lever forward to tbe fast po¬
sition, the engine should accelerate without hesitation or
sputtering. If the engine does not accelerate properly, read¬
just needle valve (A) to a slightly richer mixture.
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