Perform chainsaw maintenance at your own risk.
Parts and tools needed:
Stihl fuel pick-up 0000-350-3500
Stihl fuel line 1123-358-7702 (or 1123-358-7701)
Plastic autobody prying tools (Harbor Freight $5)
T27 Torx driver
8mm socket driver
The fuel line becomes brittle with age and exposure to E10 fuel, and will spray fuel out from around the rubber flange where it passes through the tank. The -7701 is used on the Stihl 021, 023 and 025. The -7702 is used on the MS210, MS230 and MS250 saws. The fuel pick-ups vary by model and appear to be somewhat interchangable. Check before ordering.
This is for an MS250:
Look closely at how the square tab on the fuel flange is seated in the square molding on the top of the tank. It will go back on this way:
(broken image removed)
Remove the filter cover and air filter. Pry out the handle bolt caps:
(broken image removed)
Remove the 6 T-27 Torx bolts to remove the handle (this is a good time to clean up oil and sawdust):
(broken image removed)
Remove the 2 8mm filter housing/carbureator nuts and slide off the filter housing:
(broken image removed)
Note how the cut-off contactor is fitted: the wire fits into the choke lever and the contactor lever rides on top of it. If the springy contactor lever is allowed to slip under the choke lever during reassembly, the cut-off switch won't stop the engine.
Now disconnect and remove the throttle linkage. Unsnap the throttle linkage from the trigger and rotate clockwise to unhook from the carb:
(broken image removed)
Operate the choke lever to put it in a disconnect/unhook position. In the right position it will unhook easily. Unsnap the choke lever and unhook the choke linkage:
(broken image removed)
Pull the fuel line off the carbureator:
(broken image removed)
Note how the tank vent plastic tubes fit over the carb adjustment screws. Slide the carbureator and tank vent off the threaded rods. Insure the carb gasket (still seated in this pic) is still fitted over the threaded rods:
(broken image removed)
Stihl part numbers for new fuel pick-up: 0000-350-3500 and fuel line: 1123-358-7702:
(broken image removed)
Reach into tank through filler hole with a small plastic autobody hook and fish the old pick-up out, then remove it.
Caution, don't gouge the tank or fuel line with a screw driver or sharp metal tool. Use only plastic autobody tools (Harbor Freight $5) to pry the fuel line.
Pry old fuel line out of hole in top of tank. Lube the new fuel line flange with 2 stroke oil and insert the curved end first. Work it into the tank with the square-sided tab oriented to the left in the square molding in the tank top (look at the first picture). Try to get the tab correct before the flange seats -- even lubed with 2-stroke oil, it's a #$%^& to turn.
Fish the line out of the tank as before and install new pick-up.
Reassemble in reverse, insuring tank vent tubes are seated over carb adjustment screws, linkages are correct and the springy cut-off contactor lever is lifted on top of the choke lever correctly.
Parts and tools needed:
Stihl fuel pick-up 0000-350-3500
Stihl fuel line 1123-358-7702 (or 1123-358-7701)
Plastic autobody prying tools (Harbor Freight $5)
T27 Torx driver
8mm socket driver
The fuel line becomes brittle with age and exposure to E10 fuel, and will spray fuel out from around the rubber flange where it passes through the tank. The -7701 is used on the Stihl 021, 023 and 025. The -7702 is used on the MS210, MS230 and MS250 saws. The fuel pick-ups vary by model and appear to be somewhat interchangable. Check before ordering.
This is for an MS250:
Look closely at how the square tab on the fuel flange is seated in the square molding on the top of the tank. It will go back on this way:
(broken image removed)
Remove the filter cover and air filter. Pry out the handle bolt caps:
(broken image removed)
Remove the 6 T-27 Torx bolts to remove the handle (this is a good time to clean up oil and sawdust):
(broken image removed)
Remove the 2 8mm filter housing/carbureator nuts and slide off the filter housing:
(broken image removed)
Note how the cut-off contactor is fitted: the wire fits into the choke lever and the contactor lever rides on top of it. If the springy contactor lever is allowed to slip under the choke lever during reassembly, the cut-off switch won't stop the engine.
Now disconnect and remove the throttle linkage. Unsnap the throttle linkage from the trigger and rotate clockwise to unhook from the carb:
(broken image removed)
Operate the choke lever to put it in a disconnect/unhook position. In the right position it will unhook easily. Unsnap the choke lever and unhook the choke linkage:
(broken image removed)
Pull the fuel line off the carbureator:
(broken image removed)
Note how the tank vent plastic tubes fit over the carb adjustment screws. Slide the carbureator and tank vent off the threaded rods. Insure the carb gasket (still seated in this pic) is still fitted over the threaded rods:
(broken image removed)
Stihl part numbers for new fuel pick-up: 0000-350-3500 and fuel line: 1123-358-7702:
(broken image removed)
Reach into tank through filler hole with a small plastic autobody hook and fish the old pick-up out, then remove it.
Caution, don't gouge the tank or fuel line with a screw driver or sharp metal tool. Use only plastic autobody tools (Harbor Freight $5) to pry the fuel line.
Pry old fuel line out of hole in top of tank. Lube the new fuel line flange with 2 stroke oil and insert the curved end first. Work it into the tank with the square-sided tab oriented to the left in the square molding in the tank top (look at the first picture). Try to get the tab correct before the flange seats -- even lubed with 2-stroke oil, it's a #$%^& to turn.
Fish the line out of the tank as before and install new pick-up.
Reassemble in reverse, insuring tank vent tubes are seated over carb adjustment screws, linkages are correct and the springy cut-off contactor lever is lifted on top of the choke lever correctly.
