Question about Makita DCS6401 20 20",64cc Chainsaw 2 Cycle

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My DCS401-16 starts w/difficulty, but won't run long, is leaking.

My Makita worked well until recently, except for fuel leaking and bar oil continuing to seep after shut-off. Now won't run after difficult start. Most recently, will not start at all and fuel leak worse, at top of tank where lines penetrate.

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  • Emmet Myers
    Emmet Myers May 11, 2010

    you will need to find out where the fuel is leaking from? is it eh talk or the line or maybe the carb?

  • John Bossolt
    John Bossolt Sep 24, 2012

    Fixed - tear in fuel line, a frequent phenomenon. Stock up on these.

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  • Master
  • 2,220 Answers

I suspect you have cracked fuel lines. An open line causes the saw to run lean. To large a leak and she won't run at all. Check your area for a Dolmar (owned by Makita) dealer. They sell red versions of your blue saw and for a nominal fee will be happy to help.
Lou
You own a pretty good saw.

Posted on Sep 04, 2009

Testimonial: "Great saw, but fuel flex line is prone to failure."

  • dontbother10
    dontbother10 Sep 04, 2009

    Running it lean can damage the piston and cylinder. Please get it repaired.

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Fuel getting in oil but not coolant resevoir


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Carburetor leaks after engine is shut off


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Gas in crankcase


Fuel from the fuel tank flows to the carburetor and then on into the engine cylinders. From there it seeps into the crank case.
It's a matter of gravity. The gas will seep until it reaches the lowest point in the engine.
There are two methods of correcting this dangerous problem.
1) When you are done using the engine you can turn it upside down, over a large container that is of sufficient size to contain all the gas and oil that will run out of the engine.
or
2) Turn the fuel valve to it's OFF position when you are done running the engine. This stops the fuel from seeping into the crank case from the carburetor.
(And a heads up from one who has personal, first hand experience. Be sure to OPEN the fuel shut off valve when you think you would like to start the engine.)
If you should have this happen again DO NOT try to start the engine!
(That's one of the reasons The Da always said, "Did you check the oil before you started that engine?")
Dump out all of the oil that has been contaminated with fuel and replace it with fresh oil.

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When I first crank it it smokes really bad but it clears up it not getting water in oil or oil in water


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1 Answer

What ratio oil to use dpc7310 73cc 12power


Page 12 - 50:1
1 gallon of premium fuel to 2.6 ounces of quality 2-cycle oil.
4 liters of premium fuel to 80 milliliters of quality 2-cycle oil.
Your OM
http://www.makita.ca/data/upload/tools/DPC6410,%20DPC6411,%20DPC7310,%20DPC7311,%20DPC7320,%20DPC7321,%20DPC8112%20-%20ENG%20&%20FR_owner_English.pdf

It will operate on 40:1, but starting is more difficult and it carbon fouls much quicker. Failure is usually caused by an undetected air leak the additional oil will not preclude it.

If you have more questions or need additional help please reply below and I will get back to you. Good Luck. HTH
Lou
Thank You for using FixYa.

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1 Answer

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If that works, then what is happening is that the gas in the carburetor bowl is getting depleted faster than the tank can provide it, possibly because of a clogged vent that's supposed to allow air back into the gas tank as gas is used.

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