Adjustments - Bolens HT-20 Manual

A D J U S T M E N T S
CARBURETOR
F R O N T W H E E L A L I G N M E N T
Carburetor is adjusted at the factory and should not have
to be reset. If black exhaust smoke is noted, check the air
cleaner first. A n " o v e r r i c h " mixture is usually caused by a
poorly serviced, clogged air cleaner element, not an
improperly adjusted carburetor.
If readjustment becomes necessary, stop the engine. T u r n
the M A I N and I D L E fuel adjusting screws all the way in
until they bottom l i g h t l y — do not force them closed as
this will damage the needle valves. F o r preliminary
setting, turn M A I N fuel screw out (counterclockwise) 2
full turns and the I D L E 1-1/4 turns. F o r final adjust-
ments, start engine and allow it to warm up then operate
at full throttle and under load, if possible. Turn M A I N fuel
screw in until engine slows down (lean side) then out until
it slows down again from overrich setting — note positions
of screw at both settings, then set it about half-way be-
tween the two. The I D L E fuel setting can then be adjusted
in the same manner for smoothest idle. Rough idle is often
due to the idle speed being set too low — check this also.
Figure 29
T o adjust idle speed, remove plug in heat shield (Figure 29)
to gain access to adjusting screw (Figure 30). The idle speed
should be no less than 1,200 R P M . The proper idle speed
will help prevent carburetor " l o a d u p " and engine " k i l l " .
1. Turn steering wheel so that front wheels are straight
ahead.
2. Disconnect R . H . side of tie rod from steering arm.
Measure distance across front of tire, center line to center
line. Measure distance across rear of front tire, center line
to center line and adjust toe-in from 0 to 3 / 8 " maximum,
by turning tie rod in or out as required. (Front reading
should be less than rear reading when measured across tire
center lines.)
3. Tighten hex nut securely, and reinstall tie rod into
steering arm making sure lockwasher is between ball joint
and arm.
4. Check length of steering drag link. Overall length
should be approximately 2 7 - 1 / 1 6 " . Adjust if necessary.
27-1/16 IN.
R E F .
H E X N U T ,
TIE ROD
V y
Figure 30
Figure 31
T U R N I N G RADIUS
1. A D J U S T T U R N I N G R A D I U S IF, IN M A K I N G S H O R T
T U R N S , A F R O N T T I R E I N T E R F E R E S WITH F R O N T
M O U N T E D A T T A C H M E N T B R A C K E T S O R C E N T E R
M O U N T E D A T T A C H M E N T S . A D J U S T I N G S C R E W S A R E
P R O V I D E D A S F O L L O W S :
A . Y o u will find a slot in the right hand frame at the
rear of the steering drag link where it connects to the
steering gear. (See Figure 32.) Near each end of this slot
is a square head setscrew, with lock nut, inserted in the
frame.
B. The screw at the front of the slot area controls the
L E F T turning radius. The screw at the rear controls the
R I G H T turning radius.