How do I adjust the air gap on the ignition coil

Question edited for better English.

Technical Information

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May 26, 2010 - Technicians will need to check the air gap between the ignition coil and flywheel during service inspections or after replacing the coil.

Honda Small Engine Ignition Armature Air Gaps

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The amount of clearance between the flywheel magnets and the ignition armature. The ignition armature is also referred to as ignition module, coil, laminate, ...

Use an air gap tool. Clean the area where the coil mounts on the engine with emory cloth to make sure you get a good ground. install the coil and lightly tighten screws (just over finger tight) slide in the air gap tool and align the coil, make sure both legs of the coil are even on the tool. Snug the screws and recheck the gap.

CLOSE! put two pieces of paper against the Flywheel, then put the Coil in place loosely. rotate flywheel until magnets hold the coil to the flywheel ( with paper in between) then tighten

The correct air gap is 0.3mm, slacken the ignition unit screws, slot a feeler gauge passed the ignition units metal core, turn the flywheel around to allow the feeler gauge to get sandwiched between the units core and the magnets, now re tighten the screws. If the machine still has no spark, i fear it is a new ignition unit required.

The air-gap between the ignition coil module and the magnets of the flywheel is a close tolerance. It is adjusted to about .010"-.012". This is approximately the same as the thickness of a standard size business card. I double the cover and let the magnets on the flywheel (lined up with the coil legs) pull it in tight 9compressing the paper card) and then tighten the adjustment screws. The screws have been known to vibrate loose and the gap would be lost. You can use threadlocker on the screws (optional) or just tighten them down well. Too large an air-gap is bad, but the closer the air-gap, the stronger the spark.

intermittent spark usually caused by failing ignition module in distributor cap, but first check air gap on pick up coil--should be 0.008-0.016 in. (0.2-0.4 mm). If air gap is good, replace module. If air gap is bad, adjust and see if problem resolves.

You will need to check the air gap at the ignition coil/flywheel. It should be about .010"-.012" where the magnets in the flywheel pass under the coil legs. That is about the thickness of a regular business card. So, some disassembly will be required. If the gap is closed, or too large, you would have no spark. If the gap is OK, then the coil may have failed. Make sure the screws holding it to the engine are tight, and if you remove them, you may wish to use threadlocker on them, so they don't vibrate loose and cause the gap to change. If you need more help adjusting the air-gap, please post back.

Check for spark. Maybe a crankshaft position sensor is bad or a module.

Secondary Spark Test This spark tester looks just like a spark plug, attach the clip to ground and crank the engine to check for spark
This spark tester has an adjustable air-gap for measuring spark strength and testing different voltage ignition systems
Attach the clip to ground and crank the engine to check for spark
This spark tester is the easiest to use just place it on a plug wire and the spark voltage is detected and the bulb on the top will flash with each pulse
The best way to perform this procedure is to use a spark tester (available at most automotive parts stores). Three types of spark testers are commonly available. The Neon Bulb type is connected to the spark plug wire and flashes with each ignition pulse. The Air Gap type must be adjusted to the individual spark plug gap specified for the engine. The last type of spark plug tester looks like a spark plug with a grounding clip on the side, but there is no side electrode for the spark to jump to. The last two types of testers allows the user to not only detect the presence of spark, but also the intensity (orange/yellow is weak, blue is strong).

1. Disconnect a spark plug wire at the spark plug end.
2. Connect the plug wire to the spark tester and ground the tester to an appropriate location on the engine.
3. Crank the engine and check for spark at the tester.
4. If spark exists at the tester, the ignition system is functioning properly.
5. If spark does not exist at the spark plug wire, perform diagnosis of the ignition system using individual component diagnosis procedures.

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Ignition Coil Testing

1. Remove suspect coil.
2. Disable fuel pump by disconnecting inertia switch electrical connector.
3. Reconnect the ignition coil electrical connector to the coil.
4. Install spark tester 303-D307 (D81P-6666-A) or the equivalent.
5. Crank engine while observing the tester.
6. If a blue-white spark is not observed replace coil.

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Removal & Installation To Remove:

1. Remove the air cleaner outlet pipe if interfering.
2. Disconnect the connector from the ignition coil.
   
   
3. Remove the bolt from the ignition coil.
   
   
4. Remove the ignition coil on plug.

To Install:

1. Install ignition coil on spark plug.
2. Install ignition coil bolt. Tighten to 10 Nm (89 in. lbs.).
   
   
3. Reconnect the ignition coil electrical connector.
   
   
4. Install the air cleaner outlet pipe if removed earlier.

Hello, I hope this info helps...(subytech1)...REMOVAL
In this engine, each individual spark plug is located under each ignition coil.

1. Prior to removing spark plug, spray compressed air around base ofignition coil at cylinder head. This will help prevent foreign materialfrom entering combustion chamber.
2. On this engine each individual ignition coil must be removedto gain access to each spark plug. Refer to Ignition CoilRemoval/Installation.
3. Check condition of coil O-ring and replace as necessary.

1. Inspect spark plug condition. Refer to Spark Plug Conditions.

CLEANING
Theplugs may be cleaned using commercially available spark plug cleaningequipment. After cleaning, file center electrode flat with a smallpoint file or jewelers file before adjusting gap.

CAUTION: Never use a motorized wire wheel brush to clean sparkplugs. Metallic deposits will remain on spark plug insulator and willcause plug misfire.

ADJUSTMENT

Setting Spark Plug Gap - Typical
Check spark plug gap with a gap gauge tool. If the gap is not correct,adjust it by bending ground electrode. Never attempt to adjust gap bybending center electrode.

INSTALLATION

CAUTION: This engine is equipped with copper core groundelectrode spark plugs. They must be replaced with the same type/numberspark plug as the original. If another spark plug is substituted,pre-ignition will result.

Special care should be taken when installing spark plugs into cylinderhead spark plug wells. Be sure plugs do not drop into plug wells asground straps may be bent resulting in a change in plug gap, orelectrodes can be damaged.

Always tighten spark plugs to specified torque. Over tightening cancause distortion resulting in a change in spark plug gap or a crackedporcelain insulator.

1. Start spark plug into cylinder head by hand to avoid cross threading.
2. Tighten spark plugs to 27 Nm (20 ft. lbs.) torque.
3. Before installing coil(s), check condition of coil O-ring andreplace as necessary. To aid in coil installation, apply silicone tocoil O-ring.
4. Install ignition coil(s). Refer to Ignition Coil Removal/Installation.

Most honda engines have an oil sensor that prevents the engine from starting if the oil level is low or oil is dirty. Test coil by disconnecting oil sensor wire. With sensor disconnected coil should fire. If still no fire, check kill wire for short. If still no spark, coil may need to be replaced. enjoy