Briggs & Stratton Engine 277038 Operators Manual

Operator’s Manual
Sprint 500 Series
Quattro 500 Series
LX 500 Series
SQ 500 Series
Q 500 / 550 Series
Classic 450 Series
Sprint 475 Series
Quattro 475 SeriesModel 90000 Model 100000
Quick Start Guide
on page 4
BRIGGSandSTRATTON.com

Copyright  Briggs & Stratton Corporation
Milwaukee, Wisconsin 53201 U.S.A. Form No. 277038-9/06
Printed in U.S.A. 

Safety References
The safety alert symbol () is used to identify
safety information about hazards that can result in
personal injury. A signal word (DANGER, WARNING,
or CAUTION) is used with the alert symbol to indicate
the likelihood and the potential severity of injury. In
addition, a hazard symbol may be used to represent the
type of hazard.
DANGER indicates a hazard which, if not
avoided, will result in death or serious
injury.
WARNING indicates a hazard which, if not
avoided, could result in death...

3
Starter
Handle
Fuel Fill
Carburetor
Primer
Bulb
Spark
Plug Wire
Air Cleaner
Governor
Control Lever
(if equipped)
Know Your Engine
Oil Fill/-
Dipstick
Oil Drain
Plug
Engine Model   Type    
          XXXXX  XXXX XX 
            Code
          XXXXXXXX
Muffler/Muffler Guard (if
equipped)/Spark Arrester
(if equipped) 

4
 
See page 9 for details.
HOW ?
Unscrew and remove oil cap.
Pour in oil. Replace cap.
WHAT KIND ?
High quality SAE 30 detergent oil rated SF, SG,
SH or higher.
HOW MUCH ?
To FULL line on dipstick.
Engine holds about 18 oz.
SPECIAL CONCERNS ?
Do not overfill. 
Do not tip enigine.
See page 11 for details.
WARNING
Starting engine creates sparking.
Gasoline and its vapors are
extremely flammable and
explosive. Fire or explosion can
cause severe burns or death.
If fuel spills, wait until it
evaporates...

5
For complete starting instructions 
see page 7.
HOW ?
Locate primer bulb. Press with finger. Wait two
seconds between each press.
HOW MANY TIMES ?
Press 5 times the FIRST TIME you start engine.
For all future starts, press
 3 times.
SPECIAL CONCERNS ?
Pressing primer too many times can flood
engine with gas. A flooded engine will not start. 
See Troubleshooting section.
HOW ?
Stand behind equipment.
Close bail, or operator control bar, on
equipment with this feature. If you do not keep
bail held...

6
Starter handle will not pull.
•Ensure all external equipment/engine loads are removed
before starting engine. Direct coupled equipment
components must be securely attached such as, but not
limited to, blades, impellers, pulleys, sprockets, etc.
WARNING
Troubleshooting
Engine will not start.
•Drain excess oil from engine to bring level to
FULL mark on dipstick.
•Check air cleaner filter for oil saturation. 
If saturated, clean or replace filter.
Oil Level is OVER FULL
mark on dipstick.DO NOT OVERFILL....

7
Starting
[1] Check oil level. Ensure level is at FULL mark on
dipstick. Use the correct oil type for expected
starting temperature.
[2] Fill with fresh gasoline. Move throttle to FAST.
(if equipped)
[3] Firmly push primer bulb 3 times.
Note: If starting a NEW ENGINE, press 5 times.
If engine floods, set choke to OPEN/RUN
position, place throttle in FAST (if equipped)
and crank until engine starts.
[4] Squeeze brake release bar toward handle on
mower and any other equipment with this feature.
If you do...

8
Operating
Engines give off carbon
monoxide, an odorless,
colorless, poison gas.
Breathing carbon mon-
oxide can cause nausea,
fainting or death.
WARNING
After engine has started, let it warm up several seconds
to several minutes, depending on outside temperature.
For maximum performance and life, operate engine
with throttle in FAST.
•Do not tip engine or
equipment at angle
which causes gasoline
to spill.
•Do not choke
carburetor to stop
engine.
Periodically remove grass
buildup under mower deck.
(See...

9
Oil
Oil Capacity
The engine holds approximately 18 oz. or 0.5 liter.
•Use a high quality detergent oil classified “For
Service SF, SG, SH, SJ” or higher, such as Briggs &
Stratton SAE 30.
•Do not use special additives.
•Choose a viscosity according to the table opposite.
Note:Synthetic oil meeting ILSAC
GF-2, API certification mark and API
service symbol (shown at left) with
“SJ/CF ENERGY CONSERVING” or
higher, is an acceptable oil at all
temperatures. Use of synthetic oil
does not alter required oil...

10
Changing Oil
Change oil after first 5 to 8 hours of use, then every 50
hours or every season. Change oil every 25 hours when
operating the engine under heavy load or in high
temperatures.
[1] Run engine until it runs out of fuel. Otherwise, fuel
can leak out, creating a fire/explosion hazard,
when you tip engine in Step 4.
[2] Disconnect spark plug wire and keep it away 
from spark plug.
[3] With engine OFF but still warm remove dipstick.
[4] Top oil drain, keep spark plug side up. Bottom or
side oil...