Bolens MTD7122B09 manual Dirt, Load, Adjusting, Section ~ADJUSTMENTS Carburetor Adjustment

2 Remove	foam pre-cleaner.			Spark	Plug-Clean	and reset gap at .030" every		1 00
a. Wash pre-cleaner		in liquid	detergent and warm	hours	of operation.
water	to remove	dirt.		NOTE: Do not blast clean spark			plug. Spack	plug
b. WrElp pre-cleaner		in cloth	and squeeze dry.	should	be cleaned	by scraping or	wire brushing	and

.washing

with

a commercial

solvent.

c. Saturate foam in engine 011. Squeeze to

remove

excess

oil.

0 f cartrl.dge.

Caution:

Sparking

can occur

if wire

terminal

does

not

3. Remove two nuts from top

fit firmly

on spark

plug. Reform terminal

if necessary.

4.

Remove

.Spark

clean

air

cleaner

body

is

Arrester

Equipped

Muffler-If

engine muffler

cartridge

and

equipped

with

spark

arrester

screen

assembly,

carefully to

prevent

dirt from entering

carburetor.

remove

every

50

hours for

cleaning

and

inspection.

Brush

,jirt

from

lower

air

cleaner

body Into

duct.

Replace

if damaged.

5.

Clean

cartridge

by tapping

~ently

on flat

~urface

Fuel Filter-Replace

in-line

fuel

filter

every

season.

a. If very dirty, replace cartridge or wash In a low

~ \

or non-sudsing detergent and warm water

solution.

b.

Rinse

thoroughly

from

inside

out

until

water is

I

IIn-Line

clear.

.

d

I

1/_-

c.

Cartridge

must be allowed to stand and

ry

air

Filter

thoroughly

before

using.

6.

Reassemble

air

cleaner.

f

~~~::::~~~

Caution:

Petroleum

solvents,

such

as kerosene,

are

not to be used to clean cartridge. They may cause

;

:--

-,~

deterioration of the cartridge. Do not oil cartridge. Do

not

use pressurized

air

to

clean

or

dry cartridge.

(

Clean Engine-Remove

dirt and debris with a cloth or

brush.

Clea,1ing

with

a forceful

spray

of water

is

not

\

Out

Chaff

recommended

as

water

could

contaminate

the

fuel

I

and

Dirt

system.

Clean Cooling System-Grass.

chaff or dirt may clog

---~-

the rotating s,creen and the air cooling

system,

especial-

Remove

Combustion

Deposits

every

100-300

hours

Iy after

prolonged

service

in cutting

tall

dry

grasses.

of operation.

Remove

cylinder head

and cylinder

head

Yearly

or

e'/ery 100

hours,

whichever

occurs

first,

shield. Scrape

ar,d wire brush the combustion

deposits

remove

the blower

housing

and clean

the areas shown

from cylinder,

cylinder head,

top

of piston

and around

to

avoid

ol/erspeeding,

overheating

and

engine

valves.

Use a soft

brush

to remove

deposits.

Re-

damage.

Clean

more

often if necessary.

assemble gasket,

cylinder

head

and

cylinder

head

WARNING:

Periodically

clean

muffler

area to

shield.

Torque

cylinder head screws

in a staggered

se-

remove all grass,

dirt and combustible

debris.

quence

to

140 inch

pounds

(15.82

Nm).

SECTION

4

-

~ADJUSTMENTS.

CARBURETOR

ADJUSTMENT

Mixture

r

~

A

WARNING:

If

any

adjustments

are

made

to

i

I / =..

\ \ \.

the

engine

while

the

engine

is

running

(e.g. carburetor), disengage clutches and

bla,des. Keep clear of all moving parts. Be

careful

of

heated

surfaces

and muffler.

Idle

Speed

I

Minor carburetor adjustment may be required to com- pensate for differences in fuel. temperature, altitude or

load.

NOTE: The air cleaner must be assembled to car- buretor wherl running engine.

To Adjust C;~rburetor-Gently turn valves clockwise

Adjusting				y -'
Screw	I
Throttle			."
	Stop
		Throttle		Needle	Valve
			\..I.J	(High	Speed)

until they just close. Valves may be damaged by turn- ing them -roo far.

21

jo~I:;Idle.?