Question about Makita DCS6401 20 20",64cc Chainsaw 2 Cycle

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No spark on plug even when out of engine and touching metal?

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The two most common problems are that the saw was stored at very sub-zero temperature and the condenser materials can freeze-damage so it will not charge up from the magneto. The second is that the magneto has demagnetized just by sitting for two years without running. Lawnmowers suffer from the same problem and all you have to do is start them every six months which causes the magnet to become stronger as it wizzes past the other metal on the side. You can find the laminated metal part on the aluminum rotor on the side and place a strong 1/2" magnet against the metal wherever it is exposed - for about 5 days. You will see a matching metal laminated part with the coil unit on it, don't worry about that, it is the stationary part which just reacts to the magnet as it goes by at high speed. These units are powerfull if those two parts are OK, often able to spark far more than your engine would ever require for combustion. If this fails you would have to suspect other things like the spark plug wire, the spark plug itself being eroded inside the ceramic material, or the points underneath the flywheel rotor which can fail after years of running. If all else fails buy a JONSERED like mine, it has everything going for it, less than $300 cost, simplified design, dependable for small jobs like windfalls on the road etc. and the factory is said to be right next door to HUSKAVARNA in Sweden, but I mainly like the light weight, and non metal gas tank unit which can't break out at the bottom like some HUSKY's do.

Posted on Mar 24, 2011


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06 Malibu has miss , changed ing module and blows ing fuse, changed to another and wont start. put original back and starts with miss

I don't know liter size of engine? If cylinder misfire, it should set a trouble code for that cylinder, then you check fuel--spark--compression for that cylinder.
If you have the 2.2L engine, then the ignition module sits right on top of spark plugs. You can turn the module up side down, use a known good plug in each boot, reconnect the module wiring connector. You need to turn the assembly so metal part of spark plugs touch metal part of engine or use a jumper wire from metal part of spark plugs to metal part of engine, have a helper crank it, while you watch for spark. If you got spark everywhere, then check fuel, and so on.
If you have spark plug wires, I have found a digital multimeter is sensitive enough it will react to inductive voltage. With engine running just touch each spark plug wire in turn and take a reading. You don't penetrate the plug wire or take it loose. I have seen readings about .6 or .7 volts, the point is most of them should have close to same reading, so if you get one or two that the reading is bouncing off zero, you know where to look.
I'm not saying it will work on every year--make--model, I don't know? It has worked for me, in the past.

Jul 07, 2017 | Cars & Trucks

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How do I change the spark plugs in a John Deere CR125 mower?

The best way to test for spark is to take off the wire to the spark plug, put the metal end of a screwdriver into the socket, hold the metal of the screwdriver about 1/8 inch or 3 mm away from a metal part of the engine, and crank the engine.

If you don't see a spark in the gap, the problem is in the ignition system, not the spark plug.

If you do see a spark in the gap, take the spark plug out, reattach the wire, touch the spark plug to the engine, crank it again to see if there's a spark in the spark plug. That will tell you if the spark plug is faulty.

Jun 19, 2017 | John Deere Garden

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I have changed fuel pump, filter, seems to be getting gas, turns over but wont start

With the ignition key off, remove one of the spark plug wires and insert a phillips head screwdriver into the wire cap. Place the metal part of the screwdriver near, but not touching, a metal part of the engine that is grounded (DO NOT touch the metal on the screwdriver with your hand!), then have someone crank the engine while you look for a spark between ground and the screwdriver. If no spark then suspect an ignition problem.

Dec 29, 2015 | Cars & Trucks

1 Answer

96 nissan altima gxe runs good until it gets hot then stalls

I've been there.... A nightmare!!!

Your prolem sounds as the classical Hot Coil problem with no solution. Next time when engine stalls, check for spark, touch the coil and the ignition module. If they feel hot to the touch (can't hold it), chances are there is too much resistance in the High Tension side of the ignintion circuit.
This means the circuit from the coil to the spark plugs has too much resistance. Since you already changed everything I have to ask a question: Is everything as original specs??

When I had this problem it resulted that the gap between the terminals of the distributor cap (new) and rotor where to big, This created great resistance which heated the coil and quit sending spark.

Perhaps there is something in the High Tension circuit which is out of original specs. Is the gap in spark plugs correct?
Try an old distibutor cap. Do the metal contacts in the spark plug cables touch the metal of the spark plug contact?
Does the metal contact from the cable touch the metal from the coil's contact? Are they dry?

Check things which can create a gap where electriciy has to "jump" to complete its way to the spark plug. These are the ones which cause the hot coil and hot module trouble.

Nov 12, 2013 | Nissan Altima Cars & Trucks

1 Answer

My 94 cutlass ciera won't start. It turns over and puffs a little. I put some "heat" in it and it seemed to help a little. now it turns over and puffs more, but still will not start. What...

You need to establish whether or not the engine is getting fuel and spark. Pull a spark plug wire and insert a phillips head screwdriver in the end of the plug wire,make sure it contacts the metal piece inside the wire. place the screwdriver on the engine so the metal shaft of the screwdriver is touching or almost touching a metal engine part. Now have someone try to start the engine while you look at the screwdriver. If the plug is getting fire there should be a substantial spark coming from the screwdriver to the engine. Now pull the spark plug that the wire came from and see if it is wet and smells of gasoline. If the plug is wet then you know it's not a fuel problem. Let me know what you find out with these tests and get back with me and we will try to determine course of action.

Dec 28, 2010 | 1994 Oldsmobile Cutlass Ciera

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I had this saw tuned up a few years ago and put it away. I added new fuel (40 to 1 mix) took out the spark plug and checked the gap.025 and didn't even have to clean it. I set the choke to full, made sure...

I don't know the plug number. Off the shelf chain saw plug from small engine repair shop will replace existing plug.

First of all, are you getting spark?
Take out plug. Put spark wire on plug. Hole plug by spark wire. Touch metal threads of spark plug to metal part of engine block. Metal to metal. Pull cord. Look for spark between metals. If there is no spark, then spark coil is bad.

Look at exhaust port. Is there anything that would stop the exhaust from escaping?

Can you get to fuel line running into carburetor? See if gas makes it all the way to the carburetor.

Can you get to the air filter? Is it dirty? Can you spray WD-40 directly into carburetor. A saw that has good exhaust, spark and compression will fire on WD-40.

If your engine can fire on WD-40, but will not stay running, then carburetor is suspect. Maybe gum out will work. Try to keep the engine going on WD-40 and see if that opens the carburetor.

If you can keep engine going on WD-40, that takes both hands ... use your third hand to move choke and throttle levers and see if the engine can start on its own.

Upvote if this information helps. Thanks for the feedback.

Oct 15, 2010 | McCulloch Garden

1 Answer

Bought unit new last summer. Used it once last summer and once this year. It started fine both times. Today, it will not crank. I have replaced the spark plug, checked the air filter (it is clean), gas...

Unable to crank? Do you mean unable to start?

If you leave gasoline inside tank over long period of time, that will 'gum-up' and ruin carburetor.
To prevent problem, put additive in gasoline or empty gas from tank:: under gas tank should be a hex bolt that holds up gas filter > loosen bolt and drain gas.

Starting the engine:
Take off air filter and spray WD-40 directly into carburetor.
Start engine, engine should fire on the WD-40 accelerant.
If engine fires but does not keep running, try spraying WD-40 into carburetor continuously to see if you can keep engine going.
If engine stops each time after it no longer gets WD-40, then carburetor is bad or gasoline not getting to carburetor or gasoline is bad.
Try fresh gasoline.
Do not turn small engine on side or upside down or oil will get into carburetor.

Check gas supply: Go to gas filter under gas tank. Pull loose rubber hose that connects to carburetor and see if gas comes out rubber hose.
If gas is flowing to carburetor, then carburetor is gummed up.
Small engine repair might suggest 'gum out' or have other suggestions ... but you may need a new carburetor

If engine will not fire on WD-40
If engine will not fire on WD-40 at all, then spark coil may be bad or exhaust port is clogged
Check screen that covers exhaust >> is it covered with carbon and dirt or can air pass through it easily?
Check spark
Remove spark plug
Put spark wire back on spark plug
Hold spark plug by rubber spark cap so hands don't touch metal part of spark plug
Touch spark plug threads against hole where spark plug was removed >>> metal to metal so it conducts electricity
Pull start cord and look for sparking between spark plug threads and metal of engine (don't look at the spark gap ... look where metal meets metal
If you have no spark, the spark coil is bad >> time for estimate from small engine repair shop or get your part number and order replacement

Oct 13, 2010 | Craftsman Garden

1 Answer

My 1997 Jeep grand cherokee is running real rough when I accelerate. Now while driving it it keeps stopping but will start right back up? help???

check the cables of the spark plugs, some times it occurs that the cables get loose from its plastic retainers and touch any metal in the engine, causing missfire of the related spark plug, hence rough running of the engine. Put all cables on the retainers making sure none touches the bare metal of the engine. That should help.

May 21, 2010 | 1997 Jeep Grand Cherokee

1 Answer

My car wont start

Have a buddy turn the key on run while you get down by your fuel tank and listen for the fuel pump. If you don't hear anything try hitting it while the key is still on run. Sometimes this helps. Still get a new pump even if that helps. Trust me! If the fuel pump works, check to see if there is fuel pressure in the rail.
If it is a spark issue, take out an easy to reach spark plug and reattach the wire. Lay it on the plenum of the motor so the threads are touching metal. Have someone turn the engine over while you look to see if the spark plug is sparking. DO NOT TOUCH ANYTHING WHILE SOMEONE IS CRANKING! Just make sure the threads are properly touching metal before cranking. If no spark is seen you can try to relocate it but just make sure it is not being cranked while you are touching it. Be careful! That will at least help you find out if it is lacking fuel, or spark.

Mar 22, 2010 | 1996 Ford Explorer

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