Stihl SR 450 Support Question
Stihl SR 450 Support Question
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Question posted by Ryanegan1987 on May 3rd, 2018
Stihl Sr 450 Not Starting, No Fuel In Priming Bulb
I have 4 sr 450 sprayers that we're all running for a day, now they are not starting and I am noticing that there is no fuel in the priming bulb. I replaced the spark plugs but did not replace the fuel filters and am wondering if this is the problem.
Current Answers
Answer #1: Posted by Odin on May 3rd, 2018 10:33 AM
Odin
Member since:
April 10th, 2010 Points: 41,236,680
Member since:
April 10th, 2010 Points: 41,236,680
Could be. See https://www.repairclinic.com/RepairHelp/How-To-Fix-A-Small-Engine/163---/Small-engine-won-t-start.
Hope this is useful. Please don't forget to click the Accept This Answer button if you do accept it. My aim is to provide reliable helpful answers, not just a lot of them. See https://www.helpowl.com/profile/Odin.
Related Stihl SR 450 Manual Pages
Product Instruction Manual - Page 3
... After Finishing Work Storing the Machine Engine Management Replacing the Air Filter Adjusting the Carburetor Spark Plug Engine Running Behavior Replacing the Starter Rope and Rewind Spring Inspections and Maintenance by Dealer Maintenance and Care Main Parts Specifications Special Accessories
{
SR 430, SR 450
2 Maintenance and Repairs
STIHL Incorporated Federal
2 Emission Control Warranty
12...
Product Instruction Manual - Page 7
... that the fuel system is making contact with the ground. Observe the directions for use your STIHL servicing dealer. dusts) with a missing or damaged discharge system.
0002BA001 KN
SR 430, SR 450
5
see the...and/or material safety data sheet for use with STIHL power tools, their use of 5 mm. To reduce the risk of sparking when applying any harmful effects through the use may...
Product Instruction Manual - Page 9
...has been completely removed from the fuel system.
If fuel leakage is found, do not start or run the engine until it to manufacturer's instructions.
- SR 430, SR 450
7
Never store the spray solution ...explosive mixtures.
-
Fuel
Your STIHL power tool uses an oilgasoline mixture for fueling and move at hand so that combustible fuel vapor may build up inside the fuel tank depending on ...
Product Instruction Manual - Page 10
...familiar with care after refuelling. Warning! Before Starting
Warning! Never attempt to the idle position.
a loose boot may...valve lever closed . English
Bayonet Fuel Filler Cap
Never use :
- Keep the valve lever on the spark plug -
After filling, fit the container... your power tool.
8
SR 430, SR 450 Warning! Warning! the chemicals being sucked into contact with no ...
Product Instruction Manual - Page 11
...starting and during this instruction manual. SR 450 only.
9
Check condition of injury from the fueling ... control handle cradled between your STIHL dealer for hidden obstacles such...replace damaged or worn straps.
Warning!
Keep proper footing and balance at least 50 feet (15 m) away when starting work. English
Warning! In an emergency, you are at all times. SR 430, SR 450...
Product Instruction Manual - Page 13
...spark plug) become hot during subsequent spraying with soap and water after stopping the engine.
Warning! After Finishing Work
Always wash yourself thoroughly with a different type of the machine or into the air intake and damage the fan wheel.
Empty, rinse and clean container and assembly after each use .
Use only identical STIHL replacement...repair. SR 430, SR 450
11...
Product Instruction Manual - Page 14
...storing for use . Fitting the pleated hose on the SR 450, come connected ready for longer than a few days, always empty the fuel tank.
Have such work not described in the boot ...SR 430, SR 450 Please refer to reduce the risk of fire and hearing loss.
Take care when handling gasoline!
Never test the ignition system with the boot removed from the spark plug or with a spark-...
Product Instruction Manual - Page 17
SR 430, SR 450
0002BA055 KN
Fuel
English
This engine is certified to operate on unleaded gasoline and the STIHL twostroke engine oil at a mix ratio of the fuel is also important.
Use mid-grade unleaded gasoline with a lower octane rating may increase engine temperatures. We recommend STIHL... This could cause running problems or even damage the engine. Use only STIHL two-stroke engine...
Product Instruction Manual - Page 20
... KN
N The setting lever must be on a clean, dustfree surface only to c.
18
SR 430, SR 450 Also use this setting if the engine has been running but is filled with fuel. Start your unit on F
L H
LA
N Press in the choke knob (4) and turn it to ensure that no dust is sucked in the choke knob...
Product Instruction Manual - Page 21
... cranking until the engine runs. N Pull the throttle trigger - If the engine does not start position c or under ...spark plug boot is fuel in the direction of the nozzle outlet.
N Check that the starter rope can rewind properly. Guide it might otherwise break.
the choke knob (4) automatically returns to full length -
SR 430, SR 450
19 Cranking
As soon as the engine runs...
Product Instruction Manual - Page 22
... of ignition, until completely dry N After refueling, press the fuel pump
bulb at idle speed so that engine heat can be run for a short while at least eight times -
open N ... (1). even if the bulb is started and stopped with fuel. see "Storing the Machine". closed Metering knobs
The scope of different discharge rates.
20
SR 430, SR 450 Empty the fuel tank and keep the machine...
Product Instruction Manual - Page 33
... (richer) -
N Unscrew the spark plug (2).
SR 430, SR 450
31 Adjusting Idle Speed
Engine stops while idling N Check the standard setting.
Spark Plug
English
If engine is not satisfactory when... for Operation in the gasoline), a dirty air filter and unfavorable running conditions (mostly at idling speed, first check the spark plug. Wrong fuel mix (too much engine oil in Mountains or ...
Product Instruction Manual - Page 34
... Checking the Spark Plug
Engine Running Behavior
A
N Clean dirty spark plug.
Unfavorable running behavior is unsatisfactory even though the air filter is clean and the carburetor is properly adjusted, the cause may create arcing that you have caused fouling of the proper size. (Note: If terminal has detachable SAE adapter nut, it down firmly.
32
SR 430, SR 450 Have...
Product Instruction Manual - Page 38
...Pickup body in fuel tank
Check Replace
Fuel tank
Clean
Carburetor
Check idle adjustment Readjust idle
X
X
Spark plug
Readjust electrode gap Replace after every 100 operating hours
Visual Inspection
X
Cooling inlets
Clean
Sparl arresting screen1) in container
Clean or replace
Metering unit on blower tube
Check
36
X
X
X
X
X
X
X X
X X X
X
X
X
X
X
SR 430, SR 450 English...
Product Instruction Manual - Page 40
...SR 450
63 4 3
7
5
8 9
12
10
11
13
15 14
16
26
19
20
21 22
25 27a
18
23 27
17
24
28 # 29
28 # 29
38
0002BA051 KN
1 Container Cap 2 Container 3 Lever 2) 4 Metering Unit 2) 5 Spark Plug Boot 6 Carburetor Adjusting Screws 7 Fuel Pump 8 Choke Knob 9 Starter Grip 10 Fuel Filler Cap 11 Fuel... 1) 27a Back Padding, large 1) 28 Intake Screen 29 Air Filter # Serial Number
SR 430, SR 450
Product Instruction Manual - Page 41
... For run and stop. Backplate Helps protect the back of the spray.
15. Baffle Screen To vary the direction and shape of the user.
27. Valve Lever for starting by the right hand.
20. Container Cap For closing the fuel tank.
11. Metering Unit 2) Allows to various positions or stops the engine.
21. Spark Plug...
Product Instruction Manual - Page 42
... in. (35 mm)
2.9 kW (3.9 hp) 3,000 rpm
Ignition System
Electronic magneto ignition (breakerless)
Spark plug (resistor NGK BPMR 7 A
type):
Bosch WSR 6 F
Electrode gap:
0.02 in . (1 mm)
Spraying distance,
horizontal:
47.6 ft. (14.5 m)
Discharge rate (with- Weight
Empty: SR 430: SR 450:
26.9 lbs (12.2 kg) 28.2 lbs (12.8 kg)
Max. out pressure pump, 23.33...
Product Instruction Manual - Page 44
... by the failure of time, not to exceed 30 days. Any warranted part which is not scheduled for replacement as required maintenance, or which leads to the determination that... replacement part may be performed either at STIHL Incorporated or at an authorized STIHL servicing dealer. The following list specifically defines the emission-related warranted parts:
42
SR 430, SR 450
Any replacement...
Product Instruction Manual - Page 45
... the emissions control system on your small off-road engine.
Air Filter
- Control Linkages
- Fuel Tank
- Fuel Line Fittings
- Limitations
This Emission Control Systems Warranty shall not cover any authorized STIHL servicing dealer and present the signed warranty card.
SR 430, SR 450
43 Choke (Cold Start Enrichment System)
- Magneto or Electronic Ignition System (Ignition Module...
Product Instruction Manual - Page 47
... the signed STIHL product registration card, or the print-out of charge to Subsection (4) below. Emission Warranty Parts List
Air Filter, Carburetor, Fuel Pump, Choke (Cold Start Enrichment System), Control Linkages, Intake Manifold, Magneto or Electronic Ignition System (Ignition Module), Spark Plug, Catalytic Converter (if applicable), Fuel Tank, Fuel Cap, Fuel Line, Fuel Line Fittings...
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