What is a good core return?

A good core retunr for a factory overhauled Slick Magneto is going to be a current series 4300 or 6300 Slick Magneto. If a new Slick Magneto is purchased, then older series Slick Magnetos can be considered for credit on a case by case basis.

Does this Magneto come with an impulse?

Check the "Detail" tab of the Slick Magneto that you are interested in buying and the Slick Magneto listed with a "Type: Impulsed" will come up with an impulse coupling.

What are the possible bill backs that I can get on a core return for my Slick Magneto?

There are no bill backs on a core return that is a current series 4300 or 6300 Slick Magneto.

For a Slick Magneto what is the service time?

According to the Slick Magneto by Champion Overhaul Manual L-1363F, the magneto should be overhauled at TBO, lighting strike, prop strike, sudden stoppage of the engine and immersion of the aircraft.

What size spark plug does Tempest® manufacture?

Tempest currently manufactures only 18mm spark plugs.

What spark plug should I use for my engine?

Please refer to the Tempest application chart. There are several things you will need to know as most engines have several different spark plugs approved. You will need to know your harness B-nut size. This is the nut that screws onto the spark plug. It will be either a 5/8-24” or ¾-20 thread. Be aware that a 5/8-24 utilizes a 3/4” wrench and a ¾-20 utilizes a 7/8” wrench. Long reach v. short reach will be determined by the specific engine. Heat rating is indicated by the numeric value of the spark plug part number. The lower the numeric value the colder the heat rating. Best practice is to use the same heat rated plug you have removed. Massive electrode or fine wire is a personal choice. Massive plugs will generally operate 400-500 hours. Fine wires can last 1500 hours. This choice is usually determined by number of annual hours flown and the size and performance of the specific engine.

What Ohm value is recommended on Tempest spark plugs?

Typically Tempest spark plug resistors will stay between 1000 and 1500 Ohms throughout their life. Tempest specifies that the plug resistor should never be below 500 Ohms or above 5000 Ohms. We offer a lifetime guarantee on our fired-in resistor.

How can I check my spark plug resistor?

First, the firing end of the plug must be cleaned of lead, carbon and oil. Once cleaned you can use the Tempest AT5K® or a multi-meter. If using an AT5K please see the tool section of our website. If using a multi-meter place one lead on the center electrode and the second lead on the contact point inside the spark plug terminal well. Be sure that your multi-meter is set to the correct setting.

What is the best way to clean and gap my Tempest spark plugs?

Please visit the Technical Data portion of our website to find our articles on best cleaning practices.

What causes lead fouling on my spark plug?

Indicated by hard ash-type deposits, lead fouling can be caused by poor fuel vaporization due to cold operating temperatures or high-lead content in the fuel (misdistribution of tetraethyl lead). Lightly fouled plugs can be cleaned, re-gapped, tested and reinstalled using a new copper mounting gasket. Severely fouled plugs should be replaced with new Tempest® spark plugs.

What causes carbon fouling on my spark plug?

Carbon fouling is indicated by dry, fluffy, sooty deposits. The plug is operating too cold to burn off combustion deposits. This may be fuel related or ignition related. Fuel related causes include rich fuel mixture, faulty carburetor adjustment, excessive idling or improper idle mixture. Ignition causes could be related to a worn spark plug ignition lead, improper magneto timing or running too cold of a spark plug.

What causes oil fouling on my spark plug?

Oil fouling is indicated by oily, wet deposits and frequent misfires. Causes can include damaged pistons, worn or broken piston rings, worn valve guides, sticking valves, faulty ignition supply or an engine during break-in period.

Should I rotate my Tempest spark plugs?

Yes, you should rotate your spark plugs every 100 hours. This will help even out electrode wear caused by constant polarity and capacitance after-fire. Place them in a Tempest spark plug tray (P/N T240) and follow the rotation guide supplied on every Tempest spark plug box.

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Home / Shop Parts / IKH27

P/N: IKH27

Name: SPARK PLUG, Long Reach
Brand: Hartzell Engine Technologies
SKU: IKH27
Price: 15.87 USD
Availability: BackOrder

SPARK PLUG, Long Reach

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Condition	New
Manufacturer	Hartzell Engine Technologies
Dimensions	L: 5 x W: 1 x H: 1 in
Weight	0.25 lbs
Unit of Measure	Each
Retail Price	$19.84
Your Price	$15.87
Stock Status	Expected ship date is 07-27-2026.

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E-Magneto Automotive Spark Plug

IKH27 E-MAG Long Reach Automotive Spark Plug

The Denso IKH27 is the recommended long-reach automotive spark plug for use with E-MAG electronic ignition systems and LR auto plug adapters. Featuring a 0.4mm iridium-tipped, laser-welded fine wire center electrode, the IKH27 reduces required firing voltage and improves ignition performance. Its tapered-cut U-Groove ground electrode increases ignitability and decreases quenching, making it well suited to the demands of experimental aircraft engines. Per E-MAG's installation guide, the IKH27 can be used with long-reach (LR) adapters only.

Specifications:

Thread: 14mm
Reach: Long (use with E-MAG LR adapter)
Heat Range: 27 (Denso scale — higher numbers = cooler)
Center Electrode: 0.4mm iridium
Resistor: 5kΩ monolithic resistor (reduces electromagnetic interference)
Terminal: Removable nut (solid or bare as needed)

Gap Setting: Set plug gap to 0.030"–0.035" for use with E-MAG ignitions.

Short Reach Spark Plug P/N BR8ES also available.

Note: Always install plug into adapter before installing assembly into the engine. Torque to 18 ft/lb through the plug only. Do not torque the adapter separately. Experimental aircraft only.

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