I purchased 4. One was defective. It did not produce an effective spark under pressure. Tempest and Aircraft Spruce were excellent and provided a credit. My O-300 runs nice and smooth now.

Aquila F Verified Purchase

TEMPEST SPARK PLUG UREM40E

its a spark plug

Victor W Verified Purchase

TEMPEST PLUG UREM40E 12 PK

Worked perfect, pre gapped and with a copper washer makes it even easier. Put into PA-28-140

Brendan S Verified Purchase

TEMPEST SPARK PLUG UREM40E

Plugs shipped the day they were ordered. Installed and working great!

Timothy H Verified Purchase

TEMPEST SPARK PLUG UREM40E

Replaced a bad plug. Works as required

Michael G Verified Purchase

TEMPEST SPARK PLUG UREM40E

like these better than champion

Jason B Verified Purchase

TEMPEST SPARK PLUG UREM40E

It works

Tracey M Verified Purchase

TEMPEST SPARK PLUG UREM40E

They spark great, I feel fortunate to have gotten them.

William S Verified Purchase

TEMPEST SPARK PLUG UREM40E

A good, basic, hard to find at the moment product essential for every engine. Buy some to have in stock due to shortage and supply line issues.

Peg B Verified Purchase

TEMPEST SPARK PLUG UREM40E

Very good spark plugs, been installing them for years now

Carrizozo A Verified Purchase

TEMPEST SPARK PLUG UREM40E

These Tempest plugs were ordered as replacements for my current plugs which are getting worn. The current batch has given me flawless service

Art H Verified Purchase

TEMPEST PLUG UREM40E 12 PK

So far, so good. Nicer finish than Champion.

William S Verified Purchase

TEMPEST PLUG UREM40E 12 PK

Great product with good pricing.

Washington P Verified Purchase

TEMPEST SPARK PLUG UREM40E

One spark plug was unusable out of the package. The threads were distorted.

A&p S Verified Purchase

TEMPEST SPARK PLUG UREM40E

Tempest sparkplugs are the best. Great pricing. Thanks

Chadwick L Verified Purchase

TEMPEST SPARK PLUG UREM40E

Great product

Chadwick L Verified Purchase

TEMPEST SPARK PLUG UREM40E

Product performed as expected.

George W Verified Purchase

TEMPEST SPARK PLUG UREM40E

They seem better than the champion plugs that were replaced

Glen D Verified Purchase

TEMPEST SPARK PLUG UREM40E

seem great so far, engine started right up and ran smooth

Penny M Verified Purchase

TEMPEST SPARK PLUG UREM40E

Great plugs

Miguel A Verified Purchase

TEMPEST PLUG UREM40E 12 PK

Have used many boxes of these over the years they work great.

Carrizozo A Verified Purchase

TEMPEST SPARK PLUG UREM40E

My plane became hard to start and skipped occasionally. At first, I thought it might be my mags, but decided to try a new set of Tempest plugs first. Wow! What a difference. Now, she starts easily and purrs like a kitten :-)

D. R Verified Purchase

TEMPEST SPARK PLUG UREM40E

I would definitely use Tempest Aviation Spark Plugs. Performed a resistance ohms test (using a volt/ohm meter) and found all the plugs with the manufacturers limits. Checked a Champion plugs that were installed previously and found several with resistance over 5K ohms (over 5K ohms can damage magnetos and ignition wires) whereby the Tempest plugs averaged 1.2K ohms.

Quick delivery, good price.

The plugs showed up promptly. They replaced the worn-out Champion plugs in my A-65, and I’m pleased with the Tempest plugs’ performance to date.

Installed on Cessna 150 O-200

1

Items arrived promptly, well packed and exactly what I ordered.

Spark plugs were great

Never used Tempest plugs. Willing to give them a try based on their reputation.

Great plugs, no complaints. Only one tip, if you order these, make sure you have an extra deep well 7/8 socket. Not all deep wells are created equal. I had to go to three different hardware stores and try numerous brands before I found one that fit. If you want to be certain, a DeWalt brand deep well will work. This cost me some time on installation, so maybe Ill save you the trouble.

Great application, great price. Easy order process.

Great Product, Good Price, fast shipping !!

Excellent product

Changed out the old ones and these fired right up and the engine runs great

The staff was very courteous and knowledgeable about my needs to service my plane

Fast shipping

prefer these plugs to the champion plugs.

I am a aircraft mechanic/IA I bought these spark plugs to keep ad back up. For a dropped plug or bad plug found during inspection.

They sell my product at their stores, But being they do I should be loyal. But like old habits!! you have to shop!!!!! But doing so !!! I found out The Co. had the best price other than a E bay , very little even their. So I guess it is faster and simple just open the book and order.. SAVE TIME AND !!! MONEY. SOME VENDERS WERE $10.00 HIGHER PR PLUG. AIRCRAFT SPRUCE IS EASY AND FAST.

Good plugs. All checked at appx 1600 ohms and we’re ready to install. Running well on my engine.

Well. Theyre spark plugs. I dont understand why theyre so expensive, since they havent changed in over half a century, but it is what it is. ACS prices were at least as cheap as anyone elses, fast shipping, good service.

Great price, fast shipping!!

The Tempest plugs UREM40E are perfect for my Aeronca Champ O235 Lycoming.

Great pricing and quick delivery

Working great ,better starts and less mag drop

New Sparkers working perfectly. Eliminated some vibrations that the worn out plugs were introducing.

Good product

Arrived on time. Installed and work great. I would suggest that something be added to the description about the need for a specific socket. I regular socket does not fit

Great product

Excellent product. Comes with gap needing to be fine tuned.

Very fast delivery. Aircraft Spruce has always been excellent. Well packed spark plugs .. shipped quickly. Ive been an occasional customer for the last 30+ years and never had a problem.

I’ve always used Champion plugs, but A&P recommended I switch to Tempest. Appreciate they are more affordable and after 10 hours, they are working very well still. Hope they hold up!

Tempest are good quality plugs, better than Champion according to most everyone I ask.

Great so far. Replaced all the top plugs in a o300 with massive and went with the fine wire on the bottom. Woke the old 172 up a little. Got rid of some stumbling.

I like champions, however for practical rea$ons I buy Tempest,, why? They are 5 bucks cheaper. As far as I can tell there are no practical discernible differences between the two makes. I have had champs on one magneto and Tempests on another and it made no performance difference. It be good when we can buy straight automotive plugs, those are the be$t.

Recommended. They work like theyre supposed too. Air tight packages also.

They have been lasting well over 600 hours in our club with no issues.

Seems like a more substantial, better plug than the Champions they replaced. Had 12 Champions in my O300. At annual, found seven that failed a resistance check after only 200 hours in the engine. A&P was not surprised and recommend I buy the Tempest. Purchased these, they all passed the check (as they should being brand new). Installed easily and engine is running great.

Been providing excellent service to our clubs fleet of light planes & am very happy with the service longevity of them.

Pugetsoundflyers, I Verified Purchase

TEMPEST SPARK PLUG UREM40E

One of the 8 plugs that I purchased was would not function on the aircraft and failed a function test. It was returned to Aircraft Spruce and it took 3 months to receive a replacement. This is the VERY FIRST time that I have ever had a problem with Tempest Aviation Spark Plugs. I certainly will continue to used Tempest plugs exclusively. I just wish that the replacement was more timely.

Just went up about 2 bucks again quietly :/, went to auto zone for socket to fit these, found a deep 7/8 socket for oxygen fitting with split down the middle for about $13.00 that fits perfect.

Nice product, better than champions, but. Flats on the plug body are lower than the champions profile and it took me to three different sources before I found a 7/8 inch socket that would fit the plugs . Hint:: Stick with the standard plug profile.