FIREPLUG CDI for the 1980~1984 YAMAHA SNOWMOBILES
*See below for Excel III, Phazer 480, ET340 & SRV540 from 1985~1991 options using WHITE plastic connector.
Look on side of OEM CDI for the 8N4 or 8V0 stamped or molded on the CDI enclosure. Also check wire colors and connector types for match.
This FIREPLUG CDI replaces CDI:
8N4-20 / PART# 8N4-85540-20-00
8V0-85540-21 (may use plastic plug).
Contact us with plug type configuration before ordering
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.
If your stator resistance matches below, then the 8N4-type is likely the CDI you need.
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 & terminal wiring / connectors match in pictures before ordering).
Some may use the WHITE plastic connector. We have that as well, but need to know in ORDER NOTES what type of connectors you have.
1983 SRV (SR540G)
1984 ENTICER 300 (ET300H)
1984 ENTICER 340 (ET340H)
1984 EXCEL III (EC340H)
1984 PHAZER (PZ480H)
1984 PHAZER SE (ELEC START) (PZ480SEH)
1984 SRV (SR540H)
1984 SS440 (SS440H)
*May fit through 1986 on Phazer 480 & Enticer 340 & EXCEL III. Through 1991 on SRV540 with white plastic plug (contact us to discuss prior):
After 1984 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 fully closed. This CDI required a round plastic 2-pin connector (see below). We can provide the plastic plug if your model requires it, but we need to know this prior to ordering.
Contact us before ordering if your model has this WHITE plastic plug.
* Always check your timing when changing CDI’s to confirm it is set to factory specifications.