Makita DPC7311 73cc 14Inch Gas Powered Power Cutter Logo

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Posted on Apr 13, 2012
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Makita concrete saw, no spark, new ignition coil.

I'm wondering if the flywheel magnets have deteriorated.

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Anonymous

  • 3 Answers
  • Posted on Nov 30, 2010

SOURCE: makita concrete saw dpc7321 won't start has fuel

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.

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K W

  • 509 Answers
  • Posted on Feb 18, 2011

SOURCE: Ive got a Makita concrete

The manual says to mix it 100:1 if using Makita high performance oil or 50:1 using regular Makita 2 stroke oil. I'd go 50:1 with non Makita oil too.

Here is a site to download a pdf manual if you need it.

http://www.retrevo.com/search/v2/jsp/mytrevo/myTrevo.jsp?page=man

aocomp

aocomp

  • 56 Answers
  • Posted on Apr 13, 2012

SOURCE: 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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Makita 7311 won't startt need help please?
The gap in between the flywheel and the magneto is critical.
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Aug 11, 2021 • Makita Dpc 7311 Concrete Saws
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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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Sep 02, 2013 • Makita Dpc 7311 Concrete Saws
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Change out the coil. But check to see that the wire going from the coil to the switch is not grounded out prior to the switch. Turn switch in off position and have coil unplugged to test for continuity should be none. Flip switch to run and you should have continuity now. EBay $135.00 + shipping for a coil. Get yourself a T27 long reach screw driver for the bolts needed to take off. remove air filter and housing. remove starter recoil. remove sparkplug wire. cover around sparkplug 3 T27 screws 2 tward the carb side and 1 on the flywheel; side toward muffler, then lift off. coil 2 screws and wire for grounding the coil(stop the saw) has a spade connector disconnect. replace coil and put back together in reverse. Oh by the way you should have a pretty strong magnet in the flywheel if not your have to purchase a flywheel too or re-induce magnetism to it. Coil to flywheel Gap
? aprox .020 gap should work its about the standad for all 2 strokes but you will need brass feeler gauges because you set it at the magnet on the flywheel to the iron part of the coil sticking out of the plastic coil case.
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Aug 29, 2013 • Makita Tools & Hardware - Others
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No spark
Did you try grounding the plug against a clean metal surface of the saw and pull the starter rope. If you do not see a spark I would suspect the ignition coil.or magneto that the flywheel rotates around to create an elelectrical charge. Sometimes eith the magnet on the flywhell or coil can get rusty. Try cleaning them up with some light sandpaper. Just make sure you replace the coil with the proper gap between it and the flywheel. When testing for spark as described above make sure you are not touching any metal surface on the saw or you could get a shock.
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Aug 14, 2012 • Homelite Garden
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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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Apr 13, 2012 • Makita DPC7311 73cc 14Inch Gas Powered...
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Have a almost new Makita dcs510 chain saw. I have fuel and spark, and it won't fire or start.
Assuming that the engine has good compression, remove the spark plug and pour a little fuel mix into the plug hole. Try for start--does it 'pop' a couple of times? If so, concentrate on the carburetor and fuel delivery. If nothing, try a fresh plug gapped at 0.020"--any change? The spark must be blue and snappy with a fresh plug--if it looks weak, remove the left side engine case to expose the flywheel and ignition module. Turn the flywheel so that the magnets are under the module poles, insert a thin business card into the pole gaps, loosen the module screws to allow the module poles to contact the magnets. Tighten the screws and turn the flywheel somewhat to release the card, then rotate the flywheel one full turn to make sure the pole gaps don't close up further. Recheck the spark, then try for start again. If the engine pops, check the fuel filter, air cleaner, and muffler for plugging. Check the fuel lines for decay or other damage. Make sure the carburetor is tight to the engine. Does the primer bulb pull fuel into it when pumped several times? Hope some of this helps!
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Dec 09, 2010 • Makita DCS51018 18" 45cc Chain Saw 2 Cycle
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TS350 saw , no spark, replaced ignition mod. and still no spark ? Thanks
clean flywheel and check coil try new plug
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Jul 31, 2010 • Stihl Chainsaw Cutoff Saw Flywheel 08 S...
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HAVE OLDER RANCHER 44 NO SPARK AT PLUG ATTACHED SPARK TESTOR STILL NOTHING NEW PLUG CONTINNUITY FROM SWITCH TO COIL BUT NO WAY OF CHECKING COIL OR BEYOND HARD STARTING BEFORE THEN JUST QUITE WHILE I WAS...
Remove the flywheel cover to expose the flywheel and the ignition module. Remove the ignition switch wire from the module and retry for spark. If still nothing, try using a thin business card for a gap gauge between the flywheel magnets and the module poles. Insert the card, then loosen the module screws--and allow it to stick to the magnets. Re-tighten the screws and rotate the flywheel to remove the card. Try again for spark. If still nothing, then replace the module. Install the new part as above. Don't forget the switch wire connection. Good luck!
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Jul 07, 2010 • Husqvarna "Chain Saw - 16" Bar, 3 Hp
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Installed 2 new starting coils, but still won't fire. Get only little spark. Has new spark plug. What else could be wrong?
Use a thin business card for a module gap gauge. Rotate the flywheel magnets under the ignition module, insert the card into the gap, loosen the module screws and allow it to contact the magnets. Tighten the screws again, and rotate the flywheel to remove the card. Make sure the plug has 0.020" gap. You should have plenty of fire. If not, the flywheel magnets may have gotten weak, or the ignition switch is partially grounded out. Hope this helps!
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Jun 23, 2010 • Poulan Wild Thing 2375 18" Gas Chain Saw...
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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
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