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I was given a snapper trimmer model 410 I have installed a new plug, cleaned carb (both diaphragms appear ok but are a little brittle), new fuel and return line. The trimmer starts and idles but dies on acceleration. I need to reset factory mixture and idle screws and don't have information.

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Try Replacing The Diaphragms.When They Get Brittle They Need Too Be Replaced.

Posted on Nov 15, 2010

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I have a craftsman convertiable, 32 cc line trimmer that will not stay started. have tried everything. serial number 9mtds0324sooc


My work and research show that most problems of this type are fuel system related. There is no "miracle" cure to keep the 32cc engine running. Many different things come into play here. The most common problem is dried out parts inside the carburetor. There is a small gasket and diaphragm kit to cure this however.
Your fuel system must be fairly new and with a clean fuel filter inside the fuel tank. The old fuel lines tend to become brittle and flakes of them break off and enter the carb. They get lodged on a very small screen filter that allows fuel to flow thru the carb.If fuel lines are old or brittle, replace them.
Another problem is that the carb has gone "out" of adjustment or never was adjusted correctly in the first place (not uncommon). With new, stringent EPA and CARB laws and regs, the manufacturers of these carbs set them to run very "lean". This means a lot of air and very little fuel. The problem here being that the lubricant for the engine (in this case) is IN the fuel.
Check the condition and color of the spark plug. It will tell you how the engine is performing. Clean the black carbon off of it and reinstall, or just put a new one in.
So brittle fuel lines, old, stale fuel, clogged up screen strainers inside carb, weak spark and misadjusted carbs can ALL contribute to your machine's problem. It is NOT rocket science but some standard diagnostics and testing is required to narrow down exactly what the problem is. Take a look at the things I have mentioned and remember, I have no idea how OLD or in what mechanical condition your machine is (even though I own one just like it). Post back as needed.

Sep 04, 2011 | Craftsman Garden

1 Answer

I bought a second hand RYOBI PLT3043a line trimmer and am failing to start it.


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 25, 2009 | Ryobi Garden

1 Answer

Stihl model f545 will start but will not throttle up


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 24, 2009 | Husqvarna Garden

1 Answer

I have a 22 inch 25CC gas hedge trimmer that will start fine but only run for 30-40 sec. in the "full choke" position before stopping. It will also stop if I try to give it gas. What should I do?


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 21, 2009 | Homelite Garden

1 Answer

Yard machine ym26ss straight shaft trimmer. New gas,


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 12, 2009 | Yard Machines Garden

1 Answer

String trimmer won't start. How do I flush the


To flush system
Drain tank, use primer bulb to push out fuel in the lines, refill, use primer to bring in fresh fuel. You may need to pull the rope a few times with the choke on, and then push the primer several times again. Sometimes you may need to put a few drops of fuel into the throat of the carburetor to help it start to fire.
If the problem is severe enough, you may need to remove the carb to disassemble and clean. I have listed a few things to check.


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 12, 2009 | Homelite Mighty Lite Lawn Trimmer

1 Answer

I have an etco chainsaw that will only start on the choke and stops almost immediately. The carb has been cleaned and a new diaphram fitted. A new fuel filter has also been fitted and spark plug. The spark...


Basics to check:
1) Spark plug - brown or dark brown - OK
- aluminum or silver - piston/cylinder scored
a) is it carbon or fuel fouled
b) is there spark

2) Compression - 125 to 150 psi

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

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
ChainSaws:
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

Please double check the gasekts/diaphragms for proper installation

Nov 12, 2009 | Echo 30.1CC Chainsaw With a 14 In.bar and...

1 Answer

Wont run in run position


if it runs on choke only and it sat up for two or three months the carb diaphragm may be brittle and not pumping fuel. install a carb diaphragm and gasket kit or try opening the high speed jet a 1/4 turn

Jul 01, 2009 | Craftsman 25cc Gas Line Trimmer

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