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Part# 07-26926-12
MFR Model# REM40E 12PK


In the early 1900s, small planes flew with single ignition systems powered by adapted automobile engines using Champion-brand automotive spark plugs. By the 1920s, the company had developed innovative spark plugs designed specifically for the aviation industry.

Champion Aerospace designs and manufactures Champion-brand piston-engine ignition components for both OEM and aftermarket for general aviation aircraft applications. Every spark plug manufactured has built-in design advantages that assure longer life and greater reliability.

A typical spark plug number with symbol explanation

1. Resistor None--No Resistor R--Mil-Spec. Resistor-Erosion protection
2. Barrel Style None -- Unshielded E -- Shielded 5/8"-24 Thread
H -- Shielded 3/4"-20 Thread (All Weather Plug)
3. Mounting Thread -- Reach -- Hex Size B-18mm 13/16" / 2.06cm 7/8" / 2.22cm M--18mm 1/2"/1.27cm 7/8"/2.22cm
L-14mm 1/2"/1.27cm 13/16/2.06cm U18mm 1-1/8"/2.85cm 13/16/2.06cm
J -- 14mm 3/8"/0.95cm 13/16/2.06cm
4. Heat Rating Position Low number--cold High number--hot
5. Electrode Design None-Conventional single E -- Two prong massive
N -- 4 prong massive
W -- Fine wire (Iridium) B --2 prong massive, Tangent to Center
P--Fine wire (Platinum)

* Shielded barrel thread size. Check barrel size - 5/8x24 or 3/4x20 threads before ordering and select proper plug number, See page 236 for Sparkplug Application Table.

** The "Iridium S" sparkplugs replace the Platinum and "W" Iridium types. Increased bore diameter improves scavenging action. Greater clearance volume can accept more combustion deposits. Single Iridium electrode offers greater resistance to lead attack. Easy to clean Easy to gap

Spark plugs are shipped in factory sealed plastic cases. Opened spark plug cases make the spark plugs non-returnable. Please do not open any spark plug until you are sure you have received the correct spark plugs for your application.
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Magaero L Verified Purchase


April 25, 2023

Fast service

Robert M
May 18, 2021

Great item

Gary B
February 24, 2021

This item always in stock...promptly shipped

Gary K
February 14, 2021

Great as usual

Chris E
February 11, 2021

The spark plugs arrived in perfect condition and my Pitts runs great!

Raymond D
January 5, 2021

I noticed I received REM38 on th order Thanks

Dale R
December 29, 2020

Great service once again

Case G
December 23, 2020

Good delivery and so far, good product regardless of what the issue sim the last decade with bad resistance.

Bj K
December 22, 2020

Fit perfectly and worked well

December 15, 2020


Please note, Aircraft Spruce's personnel are not certified aircraft mechanics and can only provide general support and ideas, which should not be relied upon or implemented in lieu of consulting an A&P or other qualified technician. Aircraft Spruce assumes no responsibility or liability for any issue or problem which may arise from any repair, modification or other work done from this knowledge base. Any product eligibility information provided here is based on general application guides and we recommend always referring to your specific aircraft parts manual, the parts manufacturer or consulting with a qualified mechanic.

Q: Which gasket goes with / comes with these spark plugs?

These plugs use standard 18MM copper spark plug gaskets, part number 07-00877. One is included with each plug.

Q: How does REM37BY differ from REM40E?


  • R (Resistor) = Mil-Spec. Resistor-Erosion protection
  • E (Barrel Style) = Shielded 5/8"-24 Thread
  • B (Mounting Thread/Reach/Hex Size)= 18mm, 13/16" 2.06cm, 7/8" 2.22cm
  • 37 (Heat Rating Position) = 26 is cold and 50 is hot
  • BY (Electrode Design) = Twin Electrodes Nickel (B) and Projected Core Nose (Y)
  • R (Resistor) = Mil-Spec. Resistor-Erosion protection
  • E (Barrel Style) = Shielded 5/8"-24 Thread
  • M (Mounting Thread/Reach/Hex Size)= 18mm, 1/2" 1.27cm, 7/8" 2.22cm
  • 40 (Heat Rating Position) = 26 is cold and 50 is hot
  • E (Electrode Design) = Two Electrode Massive

Q: Is there a difference between the UREM40E and the REM40E spark plugs? Are they interchangeable?

There is no difference in the applications of UREM40E and REM40E. They are the same spark plug manufactured by different companies. Tempest makes the UREM40E and Champion makes the REM40E.

Q: Do Champion REM40E plugs come with the required gasket?

Yes, each plug will include a copper gasket.

Q: Do these Champion spark plugs have the new resistor, (does not have a slot when looking into the barrel)?

Yes, if there is no slot, the plugs have the updated Fired in Resistor.

Q: What would be the price for a case, how many in the case.. 24?

We have added the dropdown where you can select the box of 12 to this web page.

Q: Have received wrong plugs, how can I ensure the plugs ordered have the 5/8 x 24 barrel thread and the not the 3/4 x 20 barrel thread

REM40E have 5/8 x 24 barrel.

Q: Is the faa form 8130 coming with the Spark plugs?

No 8130 form is not included with each plug. 8130-3 export form can be furnished if requested at time of checkout.

Q: Is the gap preset on this REM40E plug and which gap tool fits this plug?

These do come with a gap set, but Champion does recommend checking the gap before install. Something like our part number 12-01692 would work as a gap gauge.

Q: Is it ok to use the fine wire plugs with a regular magnetos, or are they designed to be used with electronic ignition?

They can be used with standard magnetos.