+$250 Core Exchange Charge
Part# 08-13713
MFR Model# 4370R
4370R KELLY OH SLICK MAG08-13713


NOTE: Core charge will be added to cart once magneto is added. Please remove drive gears before returning Magneto cores for "Core Credit."

These lightweight aircraft magnetos are being used by many new equipment manufacturers. Weigh only 3-3/4 lbs. compared to 6-1/4 lbs. for typical old style magnetos.

In early 1988, Slick discontinued the sale of re-manufactured magnetos to offer new units only.

All units carry a six-month warranty after delivery to the user. These model magnetos are completely rebuild-able. The old 4000/4100/4200 series magnetos and the 600 series magnetos may not be returned as an exchange unit for a new magneto of the same model. Only 4300 series Slick Magnetos may be returned for core credit.

Drive gears are not included.

4300 series is a direct replacement for previous 4200 series Magnetos.
California Prop 65 Warning Symbol

WARNING: The product may contain and/or expose you to a chemical(s) or substance(s) which are known to the State of California to cause cancer and/or birth defects or other reproductive harm.

Application Guide

* Applications listed in the charts below are the most common. For additional application information please see the complete application pdf above.


(See Note)
Magneto*Rotation & Impulse
Complete Harness
(2 Mags)
Sparkplug Connector
Continental A65-8, A75-8, C75-8, C85-8, C90-8
R.H. with Impulse
Continental C75-12, -15, C85-12, -14,-15, C85-12F,-14f, -15F***, C90-12,-14,-16***,0-200A,B,C
L.H. with Impulse


0-290***, 0320, 0-360, 10-320E1B, E2B

L.H. Direct Drive

Lycoming 0-235 0-290***, 0 320, 0-360 IO-320E1B,E2B AEIO-320E1B,E2B AEIO-360B1C6, H1A


L.H. with impulse
L.H. with Impulse
VW Conversion Single Ignition
R.H. with Impulse
(1 Mag)

* 4300 series replaces 4200 & feature improved cases & new bearings. Drive Gear No. 36066 applicable to Cont. A65-8, A75-8, C75-8, C85-8, C90-8,C85-12-14-15, C90-12-14-16 and 0-200A,B,C w/ light accessory case.
 Please call for price and availability.
** For new installations, order Kit No. K4521 which consists of two 4230 magnetos, one M2045 harness, two M2638 adapters (see Note 2) and four M2639 studs.

M2639 Studs
K-3328 Installation Pin & Clamp kit (one per mag)
*** The magnetos shown will fit the engine but installation is not FAA approved. Form 337 required. Note 2: Specify adapter thickness. M2638-1 (.560"), M2638-2 (.660"), M2638-3 (.760"), M2637 (.810"), measured from mounting pad to front of engine gear.
  • Frequently Purchased With
  • Customers Also Viewed
  • Related Items


This reman is running fantastic, need too give it a year on the O360 Lycom to get a better idea on longevity.

David Z Verified Purchase


January 18, 2022

Mag performs well

Palmetto A Verified Purchase


January 6, 2022

Everything as stated. Completely satisfied

Gail H
April 26, 2021

Had to confirm with staff as to what was included, eg. gaskets because of the adapter needed for the left mag. Person was very helpful in determining gaskets that were needed.

Ed T
April 9, 2021

Replacement from a defective rebuilt Magneto. The product was ready for pick up the next day and worked great. My plane is work better than it has in 3 years and it appears I have picked 5 knots of airspeed and both my Magnetos are matched perfectly and dialed in. Thank you, Keith

Keith R
February 5, 2021

It works

Ray J
October 20, 2020

They seem to work OK.

Frances P
September 16, 2020

Quickly installed and adjusted. The plane runs like a top ! Will buy again.

Carl E
September 8, 2020

Arrived quickly and well packaged . Works well.

Nigel B
October 6, 2019

Working fine so far. Apparently a good product from Kelly Aerospace.

Byron E
May 25, 2017


Please note, Pilotshop'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. Pilotshop 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: Does the Kelly 4371R overhauled Slick magneto come with the impulse coupling?

Yes, the unit does come with an impulse coupling.

Q: Is the coil replaced on the Kelly Overhauled 4300 series Slick mags?

Yes, they are replaced.

Q: How does the core exchange process work? Can I buy the mag and have it shipped first and than send the core for a rebate later?

Yes, that is exactly how it works. You buy the mag first and pay the upfront core charge. We ship the mag same day if it is in stock, if it is not in stock we ship it as soon as possible. Then once you send back an acceptable core we refund the core charge.

Q: Is the 4200 model OK for a core?

Per the vendor: No, only 4300 series Slick mags will be accepted as cores.

Q: Does the 4373R magneto come with a impulse coupling installed?

The Slick 4373 is an impulse coupled unit, and will come with the impulse coupling.

Q: What is the warranty of these magnetos (08-13713 4370,3 Kelly OH Slick Mags) the warranty is decided per hours or time?

|Kelly Aerospace Energy Systems shall be free from defects in material and workmanship under normal use and service for a period of ONE YEAR ON ALL NEW COMPONENTS and SIX MONTHS ON ALL OVERHAULED COMPONENTS. The warranty period begins (unless otherwise noted) from the date of installation into the aircraft.

Q: Does the 4371R overhauled magneto come with a new impulse coupling?

Yes, the unit does come with an impulse coupling.

Q: What is the core charge for 4373R KELLY OH SLICK MAG?

Current core charge will be automatically displayed in the shopping cart once the magneto is added to the cart.

Q: Will you accept a Champion magneto as a core for a purchased Kelly magneto?

Yes, Champion / Slick magnetos are accepted as cores.

Q: Is the kelly OH slick mag PN 4301R is interchangeable with champion slick mag 4301?

Yes, both are used for the same applications.