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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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.
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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Run what ever fuel/oil mix you are comfortable with. A run lean condition is most often caused by an undetected air leak leaning out the mixture to failure. A couple of ounces of 2-cycle oil will not prevent its occurrence. If an owners manual (OM - I tried) is ever located it likely says 32:1. Most modern saws recommend 50:1:

Oil Mix Ratio:

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I have a Makita DCS640120 Commercial Grade 20Inch 64cc and when i turn it on the chain automatically moves how do i fix it to where it will idle till i press the trigger?

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1 Answer

I have a Makita chainsaw and have forgotten what kind of oil it takes

Use regular bar and chain oil for the oil tank. Use modern synthetic saw oil for the fuel mix. Both are available from home centers, hardware stores, and saw dealers. Be sure to premix the fuel and oil in it's own can and agitate thoroughly before refueling the saw. Hope this helps!

Jun 09, 2010 | Makita DCS6401 20 20",64cc Chainsaw 2...

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,%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
Thank You for using FixYa.

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Clarification Request
Posted by rowdy45176 on Feb 21, 2009
What I would do first is remove the bar and run the saw a short time to see if oil coming out of pump (make sure there is oil in the tank) if so recheck the bar for blockage in the small round hole in the side and run something like a paper clip or small piece of metal to clean out the groove. If you need a breakdown for this tool you might want to try I haven't checked to see if it is there but usually it would be. Good luck

We need Make, model and serial numbers from the manufacturer's tag to help you any more. Your manuals can be found here:

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