Stihl FS 90 R Support Question
Stihl FS 90 R Support Question
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Question posted by Anonymous-166936 on September 19th, 2020
How To Adjust The Carburetor To Run Smooth?
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Current Answers
Answer #1: Posted by Troubleshooter101 on September 19th, 2020 10:04 PM
Troubleshooter101
Member since:
September 30th, 2015 Points: 2,927,030
Member since:
September 30th, 2015 Points: 2,927,030
We have been using several Stihl FS90R trimmers for years now. We currently use 10-12 trimmers divided among crews each year. I have found 2 common problems with these trimmers and would like to show you how to fix them. One problem is that there is a little screen inside the carburetor and after months of use, debris builds up on this screen and must be removed. I'll show you how to take apart the carburetor and clean this screen. The 2nd problem is that the carburetor needs adjustment. There is a high and low speed screw on the back of the carburetor and if your trimmer is running rough, or there is erratic idling, popping, or difficulty keeping the trimmer running, you can adjust the low speed screw until the trimmer runs smoothly. I've seen different types of carburetors on the FS90 trimmers. Some have adjustment screws that require a screwdriver and others require a hex driver or 5/32 socket. The adjustments to each of these carburetors are different. So it's best that you let your trimmer warm up and adjust the Low Speed screw slightly until your trimmer runs smoothly.
Please check this video tutorial
Thanks
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Troublshooter101
Related Stihl FS 90 R Manual Pages
Product Instruction Manual - Page 3
...
33
Operating Instructions
36
Cleaning the Air Filter
36
Engine Management
36
Adjusting the Carburetor
37
Spark Arresting Screen in Muffler 38
Spark Plug
39
Lubricating the ... Statement
STIHL Incorporated California Exhaust and Evaporative Emissions Control Warranty Statement
Trademarks
{
FS 90, FS 90 R
English
48 Allow only persons who fully understand
49
this manual. Careless...
Product Instruction Manual - Page 6
... the hand's ability to the operator's hands. Wear gloves and keep your power tool run unattended. Maintain a firm grip at all STIHL trimmers / brushcutters.
Different models may have...influence of any of their physician and the pacemaker manufacturer before operating this tool.
4
FS 90, FS 90 R the operator
2.
if you are available with a pacemaker should closely monitor the ...
Product Instruction Manual - Page 8
...can cause fire and serious burn injury or property damage. Insert the cap in the fuel tank opening with the raised positioning
6
FS 90, FS 90 R If spilled and ignited by a spark or other personal injury from the fueling spot before starting the engine. Note that ... the risk of your machine. If this with grip
Warning!
To do not start or run the engine until it to allow it is...
Product Instruction Manual - Page 9
... back to loosen or come off and spill quantities of the cap into the opening , the cap is damaged, improperly adjusted or maintained, or not completely or securely assembled. Such misalignment can cause an improperly tightened fuel filler cap to the idle... an improper attempt at tightening.
Before Starting
Warning! The throttle trigger must repeat the above steps.
FS 90, FS 90 R
7
Product Instruction Manual - Page 10
...chapters on the spark plug -
Keep the deflector (and the attached skirt where appropriate) adjusted properly at all times; The cutting attachment must be properly balanced as specified in your... be properly tightened and in the chapter on firm ground or
000BA007 KN
000BA006 KN
8
FS 90, FS 90 R Always keep them free of your power tool.
Do not attach any cutting attachment to...
Product Instruction Manual - Page 11
...adjust idle speed, see appropriate chapter of your power tool and make proper adjustments...running cutting attachment, do not wrap the starter rope around the handles, keeping the handles cradled between your hand or fingers and may result in this manual). Warning! To reduce the risk of injury from loss of moisture, pitch, oil, fuel mix or grease.
002BA054 KN
002BA055 KN
FS 90, FS 90...
Product Instruction Manual - Page 12
...bystanders should wear a respirator approved by the power tool away from inhaling toxic fumes, never run the machine indoors or in particular those with respect to avoid stumbling.
Never hold the ...starting throttle lock, as mold or pollen, can cause susceptible persons to 0 or STOP.
10
FS 90, FS 90 R Warning! For better footing, clear away scrub and cuttings.
To reduce the risk of the...
Product Instruction Manual - Page 15
... has worn as far as one of these marks.
FS 90, FS 90 R
13 However, the polymer-bladed STIHL PolyCut produces a better cut with mowing head). Pieces of the lawn.
Observe wear indicators. This causes the clutch to slip continuously and results in linelimiting blade will automatically adjust the line to important components (e.g. Frayed line is...
Product Instruction Manual - Page 19
... with a pressure washer.
English
FS 90, FS 90 R
17 The solid jet of water may damage parts of children. Before storing for longer than a few days, always empty the fuel tank.
Keep blades sharp. Store the power tool in the instruction manual. Tighten all nuts, bolts and screws, except the carburetor adjustment screws, after each use...
Product Instruction Manual - Page 31
..., not to another fuel with a manually adjustable carburetor and should be kept tightly closed in both water cooled and air cooled engines (e.g., outboard motors, snowmobiles, chain saws, mopeds, etc.). Take care when handling gasoline.
FS 90, FS 90 R
29 Your engine requires a mixture of control and / or contact with the running problems and major damage in engines...
Product Instruction Manual - Page 37
.... Make sure the carburetor is filled with fuel...Adjusting the Throttle Cable". see chapter on the stop symbol (h) to fire.
N Set the choke knob according to idle speed.
The cutting attachment must not rotate when the engine is flooded. N Push the slide control in the direction of throttle cable -
Fuel tank run...FS 90, FS 90 R
35
Guide it might otherwise break. English
N Crank the...
Product Instruction Manual - Page 38
.... For longer out-ofservice periods - This protects enginemounted components (ignition, carburetor) from around
the filter.
N Replace damaged parts. English
Operating Instructions
...run for a short while at idle speed so that engine heat can knock it out on the palm of your hand or blow it out with compressed air. If there is a noticeable loss of any major hardware.
36
FS 90, FS 90...
Product Instruction Manual - Page 39
... noticeable increase in altitude.
Adjusting the Carburetor
The carburetor comes from the factory with the idle speed screw (LA) so that the cutting attachment does not move. N Warm up the engine for adjustment
N Carry out the standard setting without disturbing the high speed screw (H). readjust if necessary -
N Open the throttle wide. FS 90, FS 90 R
37 N Check that...
Product Instruction Manual - Page 40
... idling, have your machine checked and repaired by your servicing dealer.
Cutting attachment runs when engine is idling
N Turn the idle speed screw (LA) counterclockwise until the engine runs and accelerates smoothly.
N Clean the spark arresting screen. N Fit the shroud.
38
FS 90, FS 90 R N Lift the spark arresting screen (5) and pull it down . the cutting attachment...
Product Instruction Manual - Page 44
.... N Tighten down the screws firmly.
N Run the engine until the carburetor is overtensioned and could break. N Remove, clean...FS 90, FS 90 R
N Thoroughly clean the machine - this is not the case, the spring is dry -
Pull out and straighten the twisted rope.
N Let go of fuel properly in accordance with local environmental requirements. If this helps prevent the carburetor...
Product Instruction Manual - Page 46
... of operation, by a specialist dealer 1)
Fuel tank
clean
Carburetor
check idle adjustment, cutting attachment must be shortened accordingly when working for longer than...X
X
X
X
X X
X X
X
X
X
X
X
FS 90, FS 90 R The specified intervals must not turn
X
X
readjust idle speed
Spark plug
adjust electrode gap
replace after every 100 hours of operation
visual inspection
X
Cooling...
Product Instruction Manual - Page 48
...
9
6 18 11 10
12 3
2 1
10
5
# 4 14
17
15
16
19
13
20
11 8 9
7
1 Fuel Filler Cap 2 Carburetor Adjusting Screws 3 Starter Grip 4 Spark Plug Boot 5 Muffler with Spark Arresting Screen 6 Bike Handle 7 Throttle Trigger 8 Slide Control 9 Throttle Trigger Lockout 10 Throttle ...Support 17 Handle Support 18 Wing Screw 19 Loop Handle 20 Barrier Bar # Serial Number
249BA062 KN
46
FS 90, FS 90 R
Product Instruction Manual - Page 49
...to stop . Definitions
1 Fuel Filler Cap For closing the fuel tank.
2 Carburetor Adjusting Screws For tuning the carburetor.
3 Starter Grip The grip of the pull starter, for starting throttle, run and stop the engine.
9 Throttle Trigger Lockout Must be depressed before the throttle... lead.
5 Muffler with Skirt for all Mowing
Attachments 5 Skirt 6 Metal Mowing Tool
002BA114 KN
FS 90, FS 90 R
47
Product Instruction Manual - Page 53
...Magneto or Electronic Ignition System (Ignition Module)
- Fuel Cap
- FS 90, FS 90 R
51 Mechanical diagnostic work shall be free of charge to ...part may be used for any independent test laboratory. Carburetor
- Fasteners
Where to make a Claim for Warranty...Any warranted part which leads to other services and adjustments necessary for required maintenance at an authorized STIHL servicing...
Product Instruction Manual - Page 55
... warranty period.
3.
Emission Warranty Parts List
Air Filter, Carburetor, Fuel Pump, Choke (Cold Start Enrichment System), Control Linkages...time prior to the first scheduled replacement point for
FS 90, FS 90 R
that such abuse, neglect, or improper maintenance... factory installed, and properly operating, adjustment limiting device is performed at any adjustment of a component that is liable ...
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