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Working on sthil fs74 weedaeter. redoing carb need to know order of gaskets to double check myself. cant seem to get it going 100%.starts good but doesnt perform so well so decided to clean carb . replaced fuel lines, fuel and air filter, sparkplug pretty much everything i could think of. please help

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Go to: http://www.drystacked.com for a 12 page article on Walbro brand carburetor theory and troubleshooting. This information applies to other brands as well. Check the muffler for plugging due to carbon build-up. Check the carburetor to cylinder gaskets and heat insulator for damage or plugging of the impulse passage. The engine should 4-stroke lightly when running at speed unloaded, but immediately 2-stroke when trimming. Adjust the H jet needle somewhat to achieve this. Make sure the fuel mix is fresh and using chain saw oil only at 50:1 ratio. Make sure the lower chamber diaphragm in the carburetor is flexible with no holes or cracks. Hope this helps!

Posted on Aug 07, 2010

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I have a 1971 cb100cc. I CANNOT for the life of me get that bike to run, in a sequence. Points gap is set right, advance seems to work good, it's getting fuel and has good spark. But it still will not


If every thing seems to be in order, spark, etc. , try spraying some carb cleaner down the throat of the carb and see if it fires up. The problem could be a dirty carb. Does the carb have needle valves on it? I don't know this engine so I'm giving general advice. If it does fire up when you spray carb cleaner in the carb, try using a fuel system cleaner in the gas tank, and spray the crab cleaner in the carb to get it started. change the gas filter.

Jun 02, 2014 | 1971 Honda CB 100

1 Answer

I have a 83 plymouth reliant i have replace everything but the carb it seem to stop and go right when i hit about 35 and again when i hit 65 i cleaned the carb out still seems to do it put new fuel filter...


check for vacume leaks first. you stated that the carb was loose and you tightened it. you probably need to replace the gasket beneath it (thats why the carb seemed loose)

Feb 09, 2014 | 1983 Plymouth Reliant

1 Answer

Echo HC-150 rebuilt the carb, and now the primer bulb sticks and engine won't start


Try to pressure test the carb to see if you have an internal leak. If it won't hold pressure then it is junk and needs to be replaced. If it holds then double check that you didn't accidently put the gaskets and diaphragm in wrong. If it holds and still doesn't work right replace the carb anyway. They are relatively inexpensive

Jan 20, 2013 | Echo HC-150, Hedge Trimmer 20"

1 Answer

Engine won't start


If you have spark at the right time, compression, and fuel, you should have combustion.
Was it running before you had the work done ?
Is it possible the distributor timing is off ?
You know for sure the plugs are firing, not just the coil ? And the accel pump in the carb is spraying gas ? And the choke is closed ?
A major vac leak like the PCV valve hose or intake gasket could keep it from starting.

Jul 06, 2012 | Dodge Cars & Trucks

1 Answer

My el250 starts to splutter and the power decreases will ridding


You have probobly check these things but worth a good look.
1. Is the choke working correctly
2. Is there extra air getting into fuel mix? Air filter and pre filter in good order and not perrised, Are the air box rubbers sealing on carbs and air box 100% these tend to harden an draw back into airbox off the carbs.
3. Check the above then remove the air filter and clean all part in air box housing any dirt/particals removed check deeper into air box also as there can be residue build up there, remove the pre filter from top of airbox housing and clean replace filter ir required start bike and warm up do not over rev with filter element out , spay some carb cleaner up and into air box slowly adding throttle as you do so, do this several times refit with new air filter if required fit the top of the housing checking that the little rubber gasket is in tact.
4. Check also the petrol tap is working correctly the vacuum, may not be 100% causing your power lag/starting problem.

Feb 25, 2011 | kawasaki EL 250 Eliminator V Motorcycles

1 Answer

Need A parts diagram for a Sthil G65 Blower carb.


Unfortunately, Stihl won't release any of their illustrated parts diagrams to anyone except Stihl dealers. The dealers won't release them either. It is possible that the manufacturer of the carb will have a breakdown listed on their site. Stihl primarily uses either zama carbs (www.zamacarb.com) or Walbro carbs (www.walbro.com). Look on the carb for engraved numbers and letters to let you know what series and model to search on. The manufacturer is usually listed either on the bottom diaphragm plate or up on top. Walbro series usually start with a WT, or WA. Zama will usually have a C series (ex. C1U)

Good luck!

Nov 02, 2010 | Garden

1 Answer

Old craftsman model 358352151 with 145 blade - starts with fuel added to carb but will not continue to run - new fuel line, fuel filter and gaskets - ?? why - is carb ?


if you have good compression and spark and spark at the right time and mufler and ex port are clear and you have rebuilt the carb correctly and fuel lines are not pinched anywhere

check you have put the pump diaphram on 1st then the gasket and cover, and made sure the inlet screen is clear

check you have set the meter lever flush with chamber floor and have fitted spring under the lever correctly
and fitted the gasket then then metering diaphram and the cover

lo and hi screws should be set to 1 1/4 turns out from lightly seated as a base setting

check the manifold gasket and carb gasket for a air leak or a crack in insulator block

then check for a air leak at base joint or crankcase seals

2 strokes crankcases need to be air / vacuum tight in order to draw in and pump mixture let alone operate carb diaphrams

always remember F A C T S

F = fuel A =air C = compression T = timming S = spark

then primary compression ( ie air tight cases)
have a recheck and let me know what you find

cheers pauly46

Sep 09, 2010 | Garden

1 Answer

Hi I am the proud new owner of a seemingly pretty old but in very good shape Homelite model 410. Can you believe I found it at the free box! Anyway I'm having trouble starting it, at first I thought that...


Both screws:
lightly seated
turn out (L) 1 turn
(H) 1-1/4
These are initial settings, should get the engine to start.
Below are some other basics to check
The carburetor more commonly will have varnish on the inside, and diaphragms/gaskets will need to be replaced.

Basics to check:
1) Spark plug - brown or dark brown - OK
a) is it carbon or fuel fouled
b) is there spark

2) Muffler remove for inspection
a) exhaust screen clean or plugged
b) inspect cylinder wall/piston as the flywheel is slowly rotated
3) Check cylinder compression


Fuel starvation - 'lean fuel' condition
Basic things to check:
1) spark plug
2) spark arrestor in muffler
3) fuel lines and tank filter
4) turn adjustment needles out (counterclockwise) 1/4 to 1/2 turn
Chain Saws:
5) check impulse tube and intake boot for cracks or leaks
*if all of the above are OK and/or do not improve performance then:
Remove Carburetor
6) replace gaskets/diaphragms
a) use a spray carb cleaner to clean jets, holes, and body of carb
b) fuel pump diaphragm goes against the carb body,
then the gasket towards the outside
c) metering gasket goes against the carb body,
and the diaphragm goes towards the outside

Nov 22, 2009 | Homelite Consumer Products 9.0 Amp, 14 In....

1 Answer

Flymo quicksilver 46s keeps cutting out


make sure button not cracked also fuel filter sits in bottom of tank get you a peice of coat hanger and fish it out just pulls off the end clean it good and also double check your carb sometime you can lose a gasket and it will cause similar issues? let me know if any of this helps ? can also tell you how to adjust high speed side of carb if all else fails?

Aug 29, 2009 | Garden

2 Answers

25cc weed eater, will only idle


double check your carb as it should have a screw for the fuel mixture. some carbs have a plastic piece over them that only lets you move the screws so far if you need more extreme adjustment they pull out about a 1/8th of a inch then you can turn in then push it back in, same principals as making a flame on a bic lighter bigger, if you cant find it take some pics of your carb and email them to me @ prerunnerrngr@yahoo.com and i will point them out

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