Spark Plug Cross Reference Chart

Thanks to David Kirk for researching and presenting this information.

Engine – Kohler K241 (10 HP), K301 (12 HP), K321 (14 HP), K341 (16 HP)

Manufacturer and Number Mfgr. Stock Number

Champion H10C 844

Accel 168

AC Delco M44L

Autolite 216

Bosch W9AO

Denso W14L 6013

Motorcraft AL5

NGK B4L 3112

Prestolite 14L7

Splitfire SF21F

Notes: 14mm, 7/16 reach, 13/16 hex. These plugs recommended for stock engines.

Engine* – Kohler K241 (10 HP), K301 (12 HP), K321 (14 HP), K341 (16 HP)

Manufacturer and Number Mfgr. Stock Number

Champion H8C 587

Accel 166

AC Delco CR43L

Autolite 494

Bosch ---

Denso W16LS

Motorcraft ATL4

NGK B6L

Prestolite 14L4

Splitfire ---

Notes: 14mm, 7/16 reach, 13/16 hex.

*These are colder heat range plugs for use in modified engines with higher than stock compression ratios.

Engine – Kohler K141 (6.25 HP), K161 (7 HP), K181 (8 HP)

Manufacturer and Number Mfgr. Stock Number

Champion J8C 841

Accel ---

AC Delco 44

Autolite 458

Bosch W8EC

Denso W16SU

Motorcraft A5

NGK B6S

Prestolite 14-5

Splitfire SF29E

Notes: 14mm, 3/8 reach, 13/16 hex.

Engine – Kohler KT17 Opposed Twin

Manufacturer and Number Mfgr. Stock Number

Champion RV17YC 25

Accel 577

AC Delco CR44TS

Autolite 27

Bosch ---

Denso TR14PRU

Motorcraft ARF62

NGK ---

Prestolite 14RF62

Splitfire ---

Notes: 14mm, .460 reach, 5/8 hex.

Engine – Onan 20 HP Opposed Twin

Manufacturer and Number Mfgr. Stock Number

Champion RC14YC 431

Accel ---

AC Delco FR4LS

Autolite 3926

Bosch ---

Denso ---

Motorcraft ---

NGK FR5

Prestolite ---

Splitfire ---

Notes: 14mm, 3/4 reach, 5/8 hex.