Tip & How-To about Motorcycles

How to change a Spark Plug on a scooter.

  1. Find the bore head of the engine. Situated here
  2. The spark plug will be at the front of the Head. With a HD lead cap ontop of it.
  3. Now remove the cap and remove with a spark plug wrench.
  4. When putting the new spark plug in remember to do it up hand tight first the only do a few turns with the wrench and dont do it to tight!!

By James Flower

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1 Answer

Weak spark. I have replaced ignition coil still the same.would the bike start if there is a weak spark

Hi Mark it depends how weak a good spark should be blue in colour take out the plug and remove the cap hold the plug lead close to the cylinder head and crank the engine. The spark should be able to jump between a quater to half inch from the lead to the head. The this and let me know how you go. Regards Jim...

May 15, 2015 | Motorcycles

1 Answer

no spark to spark plugs

have you checked the air gap between the pick up & stator is ther power to the coils if so you will need to test them have you checked all the relays fuses & electrical conections to the coil somethig as simple as as a lose conection can bring the best machin to a stand still you say there is no spark at the plugs is that with the plugs removed from the head & placed in the cap heald against the head with the engine turning over if so remove the cap from the lead & hold it about 6ml from the head crank the engine over if it throws a spark it would be safe to assume that the plugs or the caps have expired also you should check the leads for continuity this can be done useing a multimeter set to ohms place a probe at either end of the lead youshoul get a zero reading if there is continuity if you run all these tests & still come up cold I would try to borrow a set of coils of some one with the same model electrical gremlins can be quiet elusive let me no how you get on Iwill see you through this till it is remedied regards Geoff

Oct 28, 2009 | 2003 Yamaha V Star Classic

2 Answers

How do you change the spark plugs in a 2004 Toyota Tacoma with a 3.4 V6. The driver side has plugs with the wires leading to the other side?s plugs (passenger) that has a "coil box or something? over each plug. What is the easiest way to get the box off and then the plug out? Also on the driver side does the spark plug wire cap just pop off? It looks like a flat cap with the wire leading out. No need to turn? I have changed any plugs but never seen a box over the a plug. Any suggestions?

1997 Toyota Truck Tacoma 4WD 2.7L EFI DOHC 4cyl

Toyota Pick-ups, Land Cruiser, and 4 Runner 1997-00

Spark Plug - Removal & Installation


Fig. On the 5VZ-FE engine, you must remove the coil for access to the spark plug


Fig. Use a 3 / 8 in. ratchet, a locking extension, and a spark plug socket to reach the spark plugs which are deep down in the cylinder head


Fig. Once loosened, carefully withdraw the spark plug from the cylinder head


Fig. View of a twin electrode plug that is found in the 5VZ-FE engine

Remove the spark plugs and wires one at a time to avoid confusion and incorrect wiring during installation.
  1. Disconnect the negative battery cable, and if the vehicle has been run recently, allow the engine to thoroughly cool.
  2. On engines equipped with spark plugs, carefully twist the spark plug wire boot to loosen it, then pull upward and remove the boot from the plug. Be sure to pull on the boot and not on the wire, otherwise the connector located inside the boot may become separated.
  3. On engines with coil-over-plug ignition, remove the ignition coil for access to the spark plug. For additional information, please refer to the following topic(s): Engine Electrical, Ignition Coil.
  4. Using compressed air, blow any water or debris from the spark plug well to assure that no harmful contaminants are allowed to enter the combustion chamber when the spark plug is removed. If compressed air is not available, use a rag or a brush to clean the area.
Remove the spark plugs when the engine is cold, if possible, to prevent damage to the threads. If removal of the plugs is difficult, apply a few drops of penetrating oil or silicone spray to the area around the base of the plug, and allow it a few minutes to work.
  1. Using a spark plug socket that is equipped with a rubber insert to properly hold the plug, turn the spark plug counterclockwise to loosen and remove the spark plug from the bore.
WARNING It is recommended that you NOT use a flexible extension on the socket. Use of a flexible extension may allow a shear force to be applied to the plug. A shear force could break the plug off in the cylinder head, leading to costly and frustrating repairs.
To install:
  1. Inspect the spark plug boot for tears or damage. If a damaged boot is found, the spark plug wire must be replaced.
  2. Using a wire feeler gauge, check and adjust the spark plug gap. When using a gauge, the proper size should pass between the electrodes with a slight drag. The next larger size should not be able to pass while the next smaller size should pass freely.
  3. Carefully thread the plug into the bore by hand. If resistance is felt before the plug is almost completely threaded, back the plug out and begin threading again. In small to reach areas, an old spark plug wire and boot or a short length of rubber hose, placed on the spark plug, could be used as a threading tool. The boot will hold the plug while you twist the end of the wire and the wire is supple enough to twist before it would allow the plug to cross-thread.
WARNING Do NOT use the spark plug socket to thread the plugs. Always carefully thread the plug by hand or using an old plug wire to prevent the possibility of cross-threading and damaging the cylinder head bore. Remember, your truck has aluminum cylinder heads and the spark plug threads in the head are easily damaged.
  1. Carefully tighten the spark plug. If the plug you are installing is equipped with a crush washer, seat the plug, then tighten about 1 / 4 turn to crush the washer. If you are installing a tapered seat plug, tighten the plug to 1115 ft. lbs. (1520 Nm).
  2. If equipped with coil-over-plug ignition, install the ignition coil assembly(ies).
  3. If equipped with spark plugs, apply a small amount of silicone dielectric compound to the end of the spark plug lead or inside the spark plug boot to prevent sticking, then install the boot to the spark plug and push until it clicks into place. The click may be felt or heard, then gently pull back on the boot to assure proper contact.

I hope help you. Good luck.

Sep 30, 2009 | 1997 Toyota Tacoma

2 Answers

how do you change the spark plugs for a 1999 toyota avalon

This isnt a simple job, its best that a experienced mechanic works on this. You will need special tools for access to the rear head. All sparkplugs in the 1MZFE motor are in the center of the cylinder heads. There are COPs (coil over plugs) atop the sparkplugs, these must be removed first.**With Engine Cold** Front head: 1.remove Coils 2.use 5/8th plug socket and extension w/ratchet turn ratchet counter clockwise till plug is loose. 3. install new plugs (make sure the plugs are properly gapped). Rear Head: Intake manifold must be removed (you need a very large allen wrench for the intake bolts removal). Once this is removed follow the same steps as the front head. Here is some illustrations on the 1MZFE engine: http://www.turboninjas.com/camry/eg2.pdf


Jul 19, 2009 | 1999 Toyota Avalon

1 Answer

spark plugs

The spark plugs are right in the top of the head, through the valve cover.. There are 4 of them.. 2 are under ignition coils, and the other 2 are hooked to the coils with plug wires.

Open the hood to the Sportage. Do not perform this repair on a hot engine. If it is hot, allow it to cool down before going any further.
Locate and remove the air intake hose assembly to get it out of the way. Use the appropriate screwdrivers to loosen any clamps.
Locate and remove the accelerator throttle cable bracket using the ratchet and socket or a hand wrench.
Remove the coil cover from the cylinder head cover using the ratchet and socket. There are six bolts.
Remove the cylinder head cover. There are four bolts and two coils. Twist the boot on the high tension leads attached to each spark plug and pull them off. Inspect the spark plug cavity to ensure there is no debris or dirt inside. If so, blow it out or vacuum it out.
Place the spark plug socket onto the 12-inch long extension and ratchet and insert it onto the spark plug. Remove the spark plugs. The Gap to the new plugs should be between .039 to .043 inches
Apply a very light coat of anti-seize compound lubricant to the threads of the new spark plug(s). Install the spark plug into the cylinder using the extension and socket only. Do not use the ratchet to tighten until you're sure the spark plug has threaded into the bore correctly. Cross threading a spark plug can damage the cylinder head.
Tighten the plug to 13 to 15 foot pounds using the spark plug socket, the extension and the adjustable torque wrench. Reconnect the tension leads, the coils and four bolts to the cylinder head cover, the coil cover and six bolts, the accelerator throttle cable bracket, the air intake hose.
Test start the Sportage to ensure it's running properly and have a great day.

Jul 12, 2009 | 2001 Kia Sportage

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