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Makita concrete gas saw 14" has spark compression and fuel but wont even burb. replaced 140.00 coil but did nothing. anyone have this problem?

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  • vince janis
    vince janis May 11, 2010

    Make sure you have correct plug and gap set correctly and if you are mixing gas and oil make sure of correct ratio. If there is a safety break bar like a chain saw make sure it is disengaged. Also check to see that the fuel line is not clogged or pinched and if you have a fuel filter check it also. If you moved any needle valves you might be out of adjustment but that is only if you moved them, if you did not do not touch them at this point. Good luck!

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  • 90 Answers

Check the breather and exhaust. spark, fuel in, exhaust out. clean everything well, carbs varnish also

Posted on Aug 31, 2010

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1 Answer

I have Poulan 2375 wild thing thing chain saw I replaced plug coil carb fuel lines filters checked spark put gas in cylinder. No luck


As you have done most things regarding fuel system i would have to assume it either has not enough compression, or the ignition timing is out, so remove the muffler and check the condition of the piston face through the open port, any signs of scuffing or marking on the piston then the saw has seized at some time and the piston ring is stuck in, if all appears ok then remove the flywheel and check the key has not sheared, the key is alloy and is part of the flywheel..

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Makita concrete saw dpc7321 won't start has fuel and spark compression seems low 60 psi what should it be?


That does seem low, but it's a 2cycle.
It hasn't been run hot or w/o proper gas/oil mix has it ?
Will it fire with a squirt of starter fluid ?
If you squirt some oil into the spark plug hole, does the compression go up very much ?
If it has spark and won't fire w/starter fluid sprayed in thru the carb, it's most likely a ring/piston/cylinder problem.
If it fires with starter fluid, it's fuel not getting into the cylinder.

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My makita dpc7311 has no spark, replaced plug, coil, flywheel, what else can it be


Check the ground wire from the coil all the way to and including the contact point at the choke switch. I've encountered a couple where insulation was worn off or the wire was pinched and making contact with the head, carb or other metal part and grounding out the coil.

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Makita concrete saw, no spark, new ignition coil.


Check clearance between the coil and magnet, too far away and magnetic field won't generate.

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Have a makita gas cut-off saw dpc7321,has spark to the plug but will not start,it is getting plenty of gas too


Is the gas fresh? Is the plug wet with fuel after you try and start it? Have you done a compression test on the engine?

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Husqvarna 51 died and wont restart


hi
if you have a good compression,a strong enough blue spark and carburetion for the fuel air mixture try priming the engine(put small amount of gas in the spark plug hole)then start the engine.If the engine runs only the gas you put inside the cilinder there is a carburetion problem to find and fix.
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Makita chainsaw DCS5000 overfueling?


As you requested Steve; but you say you have spark.
Ignition module gap
Place a business or index card between the fly wheel and coil, rotate until the magnetic attraction pulls everything tight together. Tighten the coil screws, rotate the flywheel until the attraction eases and remove the card. Ensure nothing contacts when flywheel is rotated.


Is the choke open? You have enough fuel you should not need the choke. I think she is flooded. Do you have your OM handy? Might be a good time to review to flooded procedure. Probably similar to warm start with a lot of pulling.
Start Procedure
Cold:
  1. Ignition on/off to on.
  2. Set compression release – optional step even if saw is equipped with a compression release.
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4).
  4. Set compression release – optional step even if saw is equipped with a compression release.
  5. Push (open) choke pull starter until it starts. (usually first pull).
Warm:
  1. Ignition on/off to on.
  2. Set compression release – optional step even if saw is equipped with a compression release.
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) – Do not pull with choke closed.
  4. Push (open) choke, pull starter until it starts. (usually first pull).
If you have more questions or need additional help please reply below and I will get back to you. Thank you for using FixYa and Good Luck. HTH
Lou

Mar 25, 2010 | Makita DCS51018 18" 45cc Chain Saw 2 Cycle

5 Answers

Makita concrete saw dpc7321 won't start has fuel and spark compression seems low 60 psi what should it be?


I'm a retired engineer and work PT as a tool tech for an HD rental ctr.

Compression on a new cylinder/piston is 160 psi. When it drops into the 130~140 psi range the saw becomes hard to start. Below 130 the saw will not run properly and at 90 they are toast. This is mainly due to improper fuel/oil mix (must be one bottle of 50:1 synthetic oil per gallon of regular gas. I use 6 bottles to 5 gallons for addition protection). Because this type of tool works in extremely harsh conditions (concrete dust) it is also imperative to keep the air filters clean. Wash the foam pre-filter after each use with plain water from a garden hose and discard after operating 6 times. Toss away (change with new) the paper filter if dust is present or when changing the pre-filter. Also check the carb hose to the cylinder inlet for cracks. My cost to get a cylinder/piston from Makita runs app. $130. When looking into the cylinder, streaks on the exhaust side indicate improper fuel/oil mix. Streaks on the intake indicate dirty air intrusion.

Good Luck.

Feb 16, 2010 | Makita Saws

1 Answer

MAKITA WONT START.. DAMN..PETROL OK..


Does it have spark?
Change the plug and do this:
Ignition Coil Test by SmallEng.com
http://www.youtube.com/watch?v=L7WNBDRG4C4
You may need to use a jumper wire between the threaded part of the plug and the cooling fins. You do not have to bend up the electrode.

Has spark:
Was the old plug wet (flooded)?
No - put a teaspoon of mix in carburetor throat, Does it try to start?
Yes - fuel delivery problem:
Clean the muffler and spark arrestor screen. Check the fuel filter on the free end of a hose in fuel tank (manufacturer recommends an annual replacement). Check all fuel delivery lines especially at fittings and bends for cracks and holes. It can also be an air leak, inspect for a loose or defective carburetor manifold or loose carburetor. If those are good then the likely cause is internal parts of the carburetor are dirty or have failed.

Most hard starting problems are caused by flooding. Please check the procedure in your manual. It is probably similar to this:
Start Procedure
Cold:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws); pull starter and listen for an attempt to start. once heard (usually two pulls; no more than 4)
  4. Set compression release – optional step even if saw is equipped with a compression release
  5. Push (open) choke pull starter until it starts. (usually first pull)
Warm:
  1. Ignition on/off to on
  2. Set compression release – optional step even if saw is equipped with a compression release
  3. Pull (close) choke, set fast idle (done when choke closed on some saws) – Do not pull with choke closed.
  4. Push (open) choke, pull starter until it starts. (usually first pull)
If you need more help please reply below. I hope this was helpful.
Lou


Jan 19, 2010 | Makita DCS6401 20 20",64cc Chainsaw 2...

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