Question about Makita DCS51018 18" 45cc Chain Saw 2 Cycle

10 Answers

Makita DSC520i chainsaw will not start... not a pop.

New plug, getting spark. New gas, vapor expelling from cylinder with plug out so must be getting there. Always run gas dry when not going to use for awhile. Haven't used about six months. Never happened before, always starts on third to sixth pull. Yes, switch is set to on.

Never have touched high/low throttle settings.

What am I missing here? How to get the saw running???

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  • mikemoyers Nov 22, 2008

    Original request stated... new plug and getting spark. Answer... clean the plug doesn't get it.

    Please try again.

  • mikemoyers Nov 23, 2008

    Carburetor filter cleaned. H, L, S settings reset according to owner manual specs. Still no go.

    Spark fires great. Must not be getting gas. New gas in tank. No kinks in gas line.

    Now what?? Never had any problem with this saw starting for years. Suggestions???

  • mikemoyers Nov 26, 2008

    Compression ok. Never leave saw sitting with gas in it. Followed all suggestions, still no start.

    I give up.

    Found a saw shop near here that will work on Makita. Took it there.

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Check that the gas is getting to the engine, check that the high low carburetor setting had not gone bad because of the vibrations, you will probably need to adjust settings again.

The carburetor should also have a filter that you need to check up, if it is obstructed you do not get fuel into the engine.

Posted on Nov 21, 2008

  • Ginko
    Ginko Nov 26, 2008

    Sometimes you need to take apart the engine and clean all carb parts soaking them in gasoline, if you want a new chainsaw check the following choice, you can also buy online: chainsaw



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I think you may need to pull the air cleaner sponge out and
add a little fuel in the air intake....to prime it.....there is a pin
that needs fuel to float.......I always have to do this with mine
when it has not been used for a while.
Good Luck

Posted on Nov 26, 2008

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Hello,

Have you checked the choke assembly? Make sure th choke is not staying closed on you.

Posted on Nov 23, 2008

  • Slick54 Nov 23, 2008

    Hello,

    Have you checked the choke assembly? Make sure th choke is not staying closed on you.

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Hello
there are alot of good ideas here .
we have seen very poor gasoline these days and the fuel will go bad in the carb.
i dont know why but if you try to start this engine with this bad fuel it fuel foules the spark plug.
and i have tried to clean a spark plug and it will look like it sparks fine . but take it from me it wont fire under compression. so my advice is once you are sure you have all the old fuel out of the system you need to pull over the engine with the spark plug out many times to clear the chamber.
now install your NEW spark plug and start as usual.
good luck
later paul

Posted on Nov 22, 2008

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I had a saw that did this to us when we would try to use it after a long summer season. We would simply give it a shot of starter fluid to get the works going and after the first use of the season it would always start after that. Should help be careful with starter fluid small motors don't need as much as larger ones of course, just a short spray or two usually worked. Good Luck

Posted on Nov 22, 2008

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Hi,

Initially and since it is a 2stroke engine, pls try:

  • change plugs, even if clean & with spark;
  • make sure the there is no stale 2T oil in the bowl//bottom of the carb and inside the compression chamber. Pls remember that the bottom area where the piston goes down to is also part of the combustion. You can use fuel to clean and air dry or use a compressor. This is specially true for the bottom half of the combustion chamber;
  • pls make sure that the exhaust is not restricted/clogged.
Just a start, do postback how things turned up or should you need additional information. Good luck and Thank you for using FixYa.

Posted on Nov 22, 2008

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  • 76 Answers

This is a fuel blockage issue clearly.

Posted on Nov 22, 2008

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Dear Sir/Madam,

If it had fuel at one time in the carburetor before it sat it has probably "varnished." You'll have to remove and clean the carburetor. These little engines also use a diaphram system in the carb to pump the fuel. They can become hardened over time. Same fix, except re-assemble with a new carb rebuilt kit. Its easy if you have basic mechanical skills.

thanks
good luck

Posted on Nov 21, 2008

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Possible engine flush and oil change required caused by running the engine dry, takes in air/dirt through intakes causes airlocks so you get fuel starvation end engine cuts out or splutters

hope this hepls

regards

Posted on Nov 21, 2008

  • 5 more comments 
  • Lee Hodgson
    Lee Hodgson Nov 22, 2008

    use some contact spray (WD40) on the engine to repel any moisture and loosen certain parts, especially around the rip cord area! clean the fuel jets and pump and make sure it is pumping gas, if you find that the rip cord is easy to pull and it shouldn't be, there could be a casget seal broken resulting in loss of pressure to the engine

    hope this works


  • Lee Hodgson
    Lee Hodgson Nov 22, 2008

    yes an "engine flush" might work as i suggested earlier

  • Lee Hodgson
    Lee Hodgson Nov 22, 2008

    check the HT lead that goes from the spark plug engine for continuity, it may be this which is the defective part

  • Lee Hodgson
    Lee Hodgson Nov 22, 2008

    also a soda bottle top of gas into the carburetor, that usually give them a kick :)

  • Lee Hodgson
    Lee Hodgson Nov 26, 2008

    strip the engine down, lean it propery, reasaemble the engine and fill it with oil and clean fuel


    good luck and regards


  • Lee Hodgson
    Lee Hodgson Nov 26, 2008

    did the matika repair shop solve the problem?

  • Lee Hodgson
    Lee Hodgson Nov 26, 2008

    of course the engine may have seized or the piston has cracked causing the engine to loose pressure, so it will not start at all

    regards


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You need to clean the plug as it might have been accumulated with carbon monoxide

Posted on Nov 21, 2008

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