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I have a McCulloch Mac3200, I have replaced all the fuel lines, rebuilt the carb, new spark plug, and clean the muffler. When it warms up it will change rpm at high speed and bog down and has no power. It is fine until it warms up. What do I need to do?

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Sounds like you may have not mix the proper amount of oil to the gas. As the piston expands due to heat build-up the engine slows down.

Posted on Jun 15, 2009

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hello sir, my machine will only start when pumping primmer bulb or squirting fluid in the carburetor than stops. the fuel line has broken off, in most small carburetors this is a ongoing problem.old fuel will crystallize when left in tank for a long time.plugging up ports, fuel lines, small screen in carburetor.fuel lines will dissolve clogging carb.this is why it will run when the choke is on creating a vaccum to where there is fuel forced in the carb to rum,also the gas will evoporate leaving the oil behind clogging up carb.the thing to do is remove carb. and clean out,replaceing gaskets or fuel line if necessory.use carb cleaner to clean out carb.make sure to make note where fuel line go.the fuel filter broke off of fuel line letting debris get in carb plugging it up.the muffler is known to clog up a lot on these machines where thay want run. the compression should be 60 to 120 lbs any thing below 60 is junk. when adjusting the carb screws turn in all the way than turnout 1 1/4 turns turn in slow untail machine runs also you need to check for spark by removing plug and grounding aginst engine to chech spark, ok.a new spark plug would be a good ideal too , if you are going to make these repairs use new fuel line and filter,hope this helps,any comments welcome,thank you, ~~

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My husky 576 is pouring fuel out of muffler and collecting gas at spark plug. What should I.do


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Start with basic stuff first, drain the fuel tank and re fill with clean fuel oil mix, press the purge bulb ten or so times to pull the fresh fuel into the carb, now try again, if no better remove the spark plug and check for a spark ( make sure the ignition switch is on ) no spark try a new plug, still no spark check for wires shorting out, if ok replace the ignition unit, if it has a good spark is the plug getting wet with fuel, if not it may have a blockage in the carb, this will require a carb re build, if the plug is wet remove the muffler and check the condition of the piston through the exhaust port, any damage here and the saw will require a re build and possible new cylinder and or piston.

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1 Answer

Mcculloch start with choke will run when choke in will not run when use throttle wont pick 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 21, 2009 | McCulloch Garden

1 Answer

Homelite bx90 leaf blower: won't run in cold weather


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 15, 2009 | Homelite 'Yard Broom' Leaf Blower

1 Answer

35 cc


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 13, 2009 | McCulloch 16 In 4.5 Hp Electric Chainsaw...

1 Answer

Yesterday I ran the unit dry on fuel, I have rebuilt carb/replaced all fuel lines and replaced the spark plug and it still won't make rpm's


May still have dirt trapped in the carb.... take it to a specialist for "Sonic Cleaning"

Also may be worth taking the exhaust/muffler off and checking the bore for score marks to make sure it isnt seizing up

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