CRX CRX750 User manual

CRX680/CRX750
If your engine is not working properly or if there are parts missing or broken,
please DO NOT RETURN IT TO THE PLACE OF PURCHASE. Contact our
Customer Service Department at 1-877-362-4271 or [email protected]
7118266 Rev B JULY 2022

1-ENG

This engine is equipped with a
spark arresting muffler. If the
engine will be used around
flammable materials or on
land covered with materials
such as agricultural crops,
forest, brush, grass or other
similar items, then a USDA
Forest Service spark arrester
must be installed.
2-ENG

DO NOT touch hot surfaces
while operating or just after
stopping the engine. Avoid
contact with hot exhaust gases.
3-ENG

4-ENG

1
4
5
8
7
10
11
2
12
13 15
14
1Exhaust port / Spark Arrester
2
3
4
5
6
Spark plug
Oil cooler
Oil filter
Air filter cover
Choke control
7Control box / Key start /
Choke control
8
10
11
12
13
Static screen
Oil fill cap
Cylinder head cover
Dipstick
Starting motor
14
15
Muffler with heat shield
Crankshaft
3
6
2
5-ENG
9
9Throttle lever(If equipped)

6-ENG
Allow three feet of clearance on
all sides of the engine while
operating it outdoors.

Remove any excessive dirt or
debris, especially around the
muffler and static guard.
7-ENG

Oil is a major factor affecting
performance and service life.
Use SAE 10W-30 API SG or
newer automotive detergent oil
as recommended in the
MAINTENANCE section of this
manual.
Only run the engine on a level
surface. The engine is
equipped with a low oil level
sensor. The unit will shut off in
the situation where the oil falls
below the proper crankcase
sump level. To avoid
unexpected shutdown, fill the
oil to the upper limit and check
the oil level before each usage.
With the engine stopped, check
the fuel level gauge. Refill the
fuel tank (not supplied) if
necessary.
8-ENG

9-ENG

Turn the key past the “ON”
position to the “START”
position. After the engine has
started release the key allowing
it to return the “ON” position.
If the starter does not start the
engine, do not continue to crank
the engine as damage to the
starter may occur.
Do not try to continuously
crank the engine for more
than five seconds at one time.
If the engine fails to start,
allow the starter to cool one
minute before trying to restart
the engine. Continuously
trying to start the engine will
damage the starter.
The engine is equipped with a
low oil sensor; a low oil level
will prevent the engine from
starting.
Routinely inspect the oil level
before each usage of the
engine.
If the engine fails to start after
three attempts, verify that the
engine is on a level surface
and the oil level is maintained
at the proper level. Check to
verify the fuel valve is open, (if
equipped).
If the engine will not start, allow
it to stop rotating before
attempting to restart the engine.
Should you try to start the
engine while the flywheel is still
rotating may cause damage to
the starter pinion.
10-ENG
Move the throttle to the “FAST”
position (if equipped). Turn the
fuel valve to “ON” or “OPEN” (if
equipped).
The starting position of the
choke will vary depending on
the engine temperature. To start
a cold engine, pull the choke
fully to the “CLOSED” position.
If starting a warm engine, move
the choke to the midway
position between “OPEN” and
“CLOSED”.

If you have any questions about
using this engine for a specific
application, please review the
product operators manual
and/or contact your local
authorized dealer for
assistance.
4
Use the throttle lever (if
equipped) to adjust the engine
speed to the requirement of
your application.
11-ENG
Once the engine starts, push
the choke to the “OPEN”
position. If the engine does not
run smoothly, pull the choke
midway between the “OPEN”
and “CLOSED” positions. As the
engine warms, slowly push the
choke to the fully “OPEN”
position.
On cold engines, pull the
choke fully to the “CLOSED”
position. If starting a warm
engine, move the choke to the
midway position between
“OPEN” and “CLOSED”.

If you need to stop the engine in
an emergency, simply turn the
key to “OFF”. For a normal
shutdown, first move the throttle
to “SLOW” (if equipped). Allow
the engine speed to slow then
turn the key to “OFF”. If your
fuel system is equipped with a
valve, turn it to “OFF” or
“CLOSED”.
If the engine has any abnormal
noise, severe vibrations,
hunting, popping or any other
abnormal condition while
running, turn the key to “OFF”
before troubleshooting.
The engine starter requires the
electrical system to be started
or powered by a 12-volt (V)
battery with a minimum capacity
of 21 ampere-hours (Ah). The
positive (+) lead from the
battery connects to the positive
terminal on the starter relay.
Connect the negative (-) lead
from the battery to an engine
mounting bolt, the conductive
frame supporting the engine or
any other engine grounding
point.
DO NOT connect the negative
(-) battery lead to the oil filter
mounting base or any part of
the fuel system.
12-ENG

If the engine will not be used for
a period of two months or more,
drain the fuel system into an
approved container. Store the
engine in a cool, dry location.
Accidental starts can cause
severe injury or death. Before
servicing, disconnect the
negative (-) battery lead and
disconnect both spark plug
leads.
Before servicing, disconnect the
negative (-) battery lead and
disconnect both spark plug
leads. Allow the engine to cool if
hot.
13-ENG
• Disconnect the black,
negative (-) battery lead.
• See Section VI, Storage and
Transportation.

Note 2: Before each season, then follow the prescribed service interval.
Note 3: Service more frequently when operating the engine under
severe, dusty and/or dirty conditions.
14-ENG

SAE 10W-30 API SG or newer
automotive detergent oil is
recommended for general, all-
temperature use. Other
viscosities shown in the chart
may be used when the average
temperature in your area is
within the indicated range.
2. Remove the oil fill cap. Fill
using oil of the proper
recommended type.
Oil fill cap
To change the oil, it is
recommended to allow the
engine to run for a few minutes
to warm the oil. This will ensure
the used oil will drain the engine
completely.
15-ENG

Oil fill cap
2. Clean any waste oil or debris
from the oil filter port. Using
fresh oil, lubricate the seal on
the new oil filter.
4. Ensuring the engine is on a
level surface, use the
recommended grade of oil to fill
the engine to the upper limit of
the dipstick. Do not overfill.
1. Using an oil filter removal
wrench, loosen the filter and
remove. Pour the oil contained
in the filter into the pan of waste
oil.
3. Tighten the filter by hand or
as per the filter instructions.
Replacing the oil filter
16-ENG
4. Return and tighten the oil fill
cap.
3. Ensuring the engine is on a
level surface, use the
recommended grade of oil to fill
the engine to the upper limit of
the dipstick. Do not overfill.
Promptly clean up any spilled oil
on the engine or the
surrounding area. Clean your
hands with soap and warm
water.
Only dispose of the waste oil at
a local waste oil recycler.
1. Place an appropriate
container below the oil drain
bolt. Remove the oil filler cap.
Next, using a wrench, loosen
the drain bolt counterclockwise.
Once loose, fully unthread the
bolt with your fingers removing
it and the bolt gasket.
2. When the oil is completely
drained, inspect the drain bolt
gasket for damage; replace if
required. Hand thread the drain
bolt. Using a wrench, tighten
until snug.