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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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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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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
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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...

1 Answer

Will not start


Check for spark
Ignition Coil Test
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 don’t have to bend up the electrode.

If spark present put a small amount of mix in the carburetor. Does it at least try to start?
If yes you most likely have a fuel delivery problem. Inspect for splits and holes in fuel lines especially at fittings and bends.
If no any number of problems. Try your friendly neighborhood chainsaw shop.

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)
  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) - Don’t pull with choke closed.
  4. Push (open) choke, pull starter until it starts. (usually first pull)
Hope this helps
Lou


Oct 11, 2009 | Makita DCS6401 20 20",64cc Chainsaw 2...

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