Thumbs 1
Thumbs 1

Magneto Timing Lights / Synchronizers

From $67.85 to $69.95
Description Part Number Price Buy
Dual Magneto Synchronizer with Tweeter
Single Magneto Timing Light with Tweeter
Subtotal $0.00
Add to Wishlist


These devices measure the change in inductance in the magneto coil when the points open and close. Simply shorting the clip leads together will not indicate a point closing, therefore eliminating any false reading caused by loss of contact to the magneto grounding terminal. To use, simply remove one plug from each cylinder. Connect black clip lead to engine ground. Connect red and green leads to right and left magneto terminals. Turn propeller slowly. When the points open the L.E.D.s will turn off and the audio "tweeter" will sound. The magneto connected to the red lead will sound a rapid beat and the magneto connected to the green lead will sound a slower beat. When both sets of points are open, a third and continuous sound will be emitted. Adjust magneto timing accordingly.

100% solid state, compact 3/4" x 3" x 5" size, long battery life. Color coordinated leads are 4 ft. long. Comes in strong anodized aluminum case. Also available for single magnetos and without tweeter. The single timer is more expensive now because it is a new, updated version or style. This is a deluxe style with tweeter that has a sound system and 4 foot leads.


Works as advertised. Checked internal timing of my Slick mag and checked timing of 2 on engine Bendix mags.

James R Verified Purchase


January 19, 2022

Works great!

Mark S Verified Purchase


November 14, 2021

Works as advertised

Victor L Verified Purchase


November 2, 2021


James G Verified Purchase


November 2, 2021

Kevin G Verified Purchase


October 19, 2021

would recomend to anyone

Art S Verified Purchase


October 10, 2021

Was recommended to set timing on my vintage BMW motorcycle. Built solidly & performs perfectly. Worth every penny! Delivery in Canada took about a week, & did not have to worry about customs fees.

February 6, 2020

Great item, fast ship.

Pedro M
August 12, 2019

A very useful unit, worked great on my old (1958) BMW motorcycle. An additional paragraph in the instructions on how to use the tool with a magneto ignition motorcycle would be a great addition.

David B
June 14, 2019

This device works amazingly well. I was able to time my mags in five minutes.

Andrew N
February 11, 2019


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: Will the dual mag synchronizers work if used on a single mag?

Per the supplier: Yes, they will work on a single mag.

Q: Will the dual mag synchronizers work if used on a single mag?

Per the supplier: Yes, they will work on a single mag.

Q: Will the single work on classic outboards?

This will only work if you have a breaker point ignition system. It will not work if you have a more modern electric system.

Q: When the plug is to fire for timing do the lights on the synchronizer go out or do they turn on?

The lights will go out when it fires.

Q: Is there a manual included with these INDUCTOR MAGNETO SYNCHRONIZERS?

Yes, these synchronizers include an instruction sheet in the box.

Q: Do you have recommended use instructions?

Per the manufacturer: The dual and single mag timers have operating instructions included with each timer. First time users sometimes do not read the instructions and erroneously assume that this timer will do the same thing as a different brand of timer. They sometimes think that they should get a sound indication by touching the ground lead (alligator clip) to the red or green lead. This again is an erroneous assumption on their part - based on their experience using a different make of Timer.

When I get an inquiry from someone who is having difficulty using the device, I do the following-
1) For Dual Synchronizers - I ask if both LED lights go on when the device switch is slid to the on position. If only one light goes on - there is a defect and the device should be returned to me. If no light goes on I ask that they replace the 9 volt battery and try again. With the single mag timer -only the LED labeled "Closed" should light up when the device is switched to "ON".

2) I ask them to attach the device to a working magneto. It's safest and best to do this on a bench with the magneto removed from the engine. They should clip the black ground wire to the magneto's casing and attaching either the red or green wire lead to the Magneto's "P" terminal. Then by rotating the Magneto's shaft they can expect to get the appropriate light and sound signals from the timing device. Sometimes they have a bad magneto and they need to try it on a second magneto

Often, I get inquiries from non-licensed mechanics who want to be walked through the entire timing procedure. I inform these individuals that this is a procedure that only licensed AP mechanics can legally perform.

Q: Does this come with the Bendix adapters to connect the leads to? If it does have the adapter, which series Mags are covered?

This will work with both slick and bendix, per the instructions you just connect the clamps to the pleads.

Q: Does this run on batteries, and if so are the batteries replaceable?

Yes this uses a standard 9v battery.

View in Catalog

View Image View in Catalog