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Hi my McCulloch mac 70 keeps loosing power,I have changed the fuel filter,spark plug and air filter the mixture is right but still won't run right,any ideas?many thanks Barrie.

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Check the muffler for any type of obstruction first. Then I would check the diaphragm in the carburetor to make sure it isn't starting to stiffen up. If that doesn't help it may be that it is just old and tired

Posted on Jan 16, 2013

Testimonial: "Many thanks,it was the muffler very useful information,thanks again,kind regards Barrie."

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McCulloch mcc1635a chainsaw won't run. Acts like it is starving for fuel.


take off the muffler and try it there is a screen inside that get plugged up with carbon you can open the muffler to clean it

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Sounds like you have a compression problem. Starting fluid will fire at a much lower compression than a gas/oil mix so that's why it will start with it. When the motor is running you get a little more compression because the piston is coming up so fast. You should check the condition of your cylinder wall and piston & ring. If they are damaged at all you loose compression which directly affects starting and running power.

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Why does my 1995 mazda protege sputter and die when i accellerate


An engine needs three things to function correctly: (1) the right amount of fuel; (2) the right amount of air; and (3) an appropriate spark. I would also add a fourth point for a gasoline engine: appropriate compression in the engine. A worn-out engine won't perform well, even if items 1-3 look good.

Poor fuel flow is one possible cause of poor performance. A clogged fuel filter is only one possible cause of that. You might have a weak fuel pump, although with the electric fuel pump on this car, that would either have the car running or not running at all, not running poorly. You might very well have a clogged fuel injector--gas is getting there, but an inappropriate amount is getting sprayed into the combustion chambers. You might also have a clogged fuel intake screen inside the gas tank--the fuel pump might not be able to **** up enough fuel.

Air is another possibility. Check your air filter. Is it clean? A clogged air filter will cause incomplete combustion when you step on the gas because not enough air is getting in to create a proper air/fuel mixture. A simple test for this is to try running the car--VERY BRIEFLY--without the air filter. Does it run better? You should not run your car without an air filter for any longer than diagnostic reasons--sucking dust and dirt into your engine is a fast way to ruin it--but it's an easy and essentially free test you can perform. Or you can just replace the air filter if the one you pull out looks nasty.

A final consideration is spark. If you have a weak spark, you won't get as strong an explosion in your cylinders, yielding less power and stumbling. Or, if the spark comes at the wrong time, you'll have the same problem. You can check for a strong spark by taking a spark plug--an old one, a new one, one that doesn't even match your car, and using it to test the spark coming off each of your spark plug wires. Attach the plug to a wire you disconnect, ground the tip of the wire against exposed metal on your engine, and look for a nice healthy blue-white spark. If you see a yellow or orange spark, that's not so good. That could indicate a weak ignition coil--or also old spark plug wires that are leaking voltage. Spark plug wires should probably be changed every 5-6 years; they're not a lifetime part of your car.

A final consideration I didn't list previously is that you may have a bad O2 or other sensor that measures and adjusts the air / fuel mixture. A bad sensor will force your car's computer to operate on a default profile designed to let you limp home. However, it won't perform particularly well.

Good luck; I hope this gets you pointed in the right direction.

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