Stihl BR 800 Service Manual

BR 800 5
4.5 Starter rope is difficult to pull or rewinds very
slowly
4.6 Engine does not run or runs erratically, with misfi-
ring and sporadic loss of power
Check the following Yes No
1. Is the rewind starter clean? Go to 2. Clean starter mechanism
Go to 2.
2. Are windings of rewind spring stuck
together?
Coat rewind spring with standard sol-
vent-based degreasant containing no
chlorinated or halogenated hydrocar-
bons. Pull starter rope several times
until normal action is restored
Repair completed.
Replace rewind starter, @ 6.2.
Repair completed.
Check the following Yes No
1. Is MDG 1 analyzer available? Create diagnostic report.
Test blower with MDG 1 analyzer.
Repair completed.
Go to 2.
2. Test ignition system with ZAT 3 or
ZAT 4, @ 13.2.
Sparkover?
Go to 19. Go to 3.
3. Is correct spark plug installed? Go to 4. Install correct spark plug.
Go to 4.
4. Is spark plug sooted or smeared with
oil?
Clean or replace the spark plug.
Go to 5.
Go to 5.
5. Is spark plug electrode gap correct? Go to 6. Set electrode gap correctly.
Go to 6.
6. Is spark plug boot damaged? Replace spark plug boot, @ 13.6.
Go to 7.
Go to 7.
7. Check resistance: spark plug boot to
ground.
Is resistance of spark plug boot to
ground 1.5 kΩ to 12 kΩ?
Go to 8. Replace ignition lead, @ 13.6.
Go to 8.
8. Leg spring hook in center of ignition
lead?
Go to 9. Replace spark plug boot, @ 13.6.
Go to 9.
9. Air gap between ignition module and
flywheel correct?
Go to 10. Set air gap correctly, @ 13.7.
Go to 10.
10. Is black wire of wiring harness
chafed?
Replace throttle cable with wiring har-
ness, @ 14.2 and @ 15.2.
Go to 11.
Go to 11.
11. Is insulation on connector of wiring
harness’ black wire in order?
Go to 12. Replace throttle cable with wiring har-
ness, @ 14.2 and @ 15.1.
Go to 12.
12. Is connector of wiring harness’ black
wire firmly seated?
Go to 13. Push connector of wiring harness’
black wire firmly into place, @ 14.3.
Go to 13.
13. Is ignition lead chafed? Replace ignition lead, @ 13.5.
Go to 14.
Go to 14.

Stihl BR 800 Specifications

General

Type	Backpack blower
Airflow	2025 m³/h
Suction mode	-
Product color	Black, Orange, White
Airspeed (max)	349.2 km/h
Power source	Gasoline
Sound power level	112 dB
Sound pressure level	104 dB

Weight and Dimensions

Weight	11700 g