FIREPLUG CDI for YAMAHA 1980-1991* SNOWMOBILES 8N4-20 type


NEW for WINTER 2018/2019


*See below for ET340 & SRV540 from 1985~1991 options

This FIREPLUG CDI replaces CDI # 8N4-20  / PART# 8N4-85540-20-00

More energy over stock OEM CDI.

Uses Factory OEM-style connectors & terminals for direct plug-in to factory harness.

NOTE: FIREPLUG CDI is similar in size to OEM and will fit into original rubber mounting boot-strap

*Follows OEM timing profile for true plug & play installation.

Stator resistance values: +/- ~20%:
TRIGGER : Black to Red/White = 20 ohms
CHARGE : Black to Brown = 1400 ohms (1.4KΩ)

Best WARRANTY available!

MAY FIT THE FOLLOWING  (please confirm your model matches below & matches the terminal wiring in pictures before ordering)
1980 SR540D
1981 SR540E
1982 ET340F
1982 ET340TF
1982 SR540F
1982 SS440F
1983 EC340G
1983 ET300G
1983 ET340TG
1983 SS440G
1983 SRV (SR540G)
1984 ENTICER 300 (ET300H)
1984 ENTICER 340 (ET340H)
1984 EXCEL III (EC340H)
1984 PHAZER (PZ480H)
1984 SRV (SR540H)
1984 SS440 (SS440H)

*May fit through 1986 on Enticer 340 & through 1991 on SRV540 with slight wiring modification:

After 84 there was an added throttle position sensor that tied into the CDI kill-switch wiring.  This was a safety function to eliminate engine start if throttle wasn’t closed.  This required a round plastic 2-pin connector (see below) that we do not have access to.   We may be able to provide an adapter harness if the user wants to cut this plug off their dead CDI and plig into the FIREPLUG kill-switch wire.

contact us before ordering if your model has this plug.

* Always check your timing when changing CDI’s to confirm it is set to factory specifications.

Additional information

Weight 1 lbs