Inhaltsverzeichnis
Overview of the spark plugs used
NGK spark plugs used
| engine type | spark plug used | tightening torque with cold engine |
|---|---|---|
| 275 | NGK B8ES | 27 Nm |
| 447 | NGK B8ES | 27 Nm |
| 462 | NGK B8ES | 27 Nm |
| 501 | NGK B8ES | 27 Nm |
| 503 | NGK B8ES | 27 Nm |
| 505 | NGK B8ES | 27 Nm |
| 532 | NGK B8ES | 27 Nm |
| 535 | NGK B8ES | 27 Nm |
| 582 | NGK B8ES | 27 Nm |
| 912 (80 hp) | NGK DCPR7 | 20 Nm |
| 912 S (100 hp) | NGK DCPR8 | 20 Nm |
| 912 iS injection | NGK DCPR8E | 20 Nm |
| 914 Turbo | NGK DPR9EA-9 | 20 Nm |
The designation of the spark plug connectors on 912 and 914 is VD05FMH.
These are still available from motorcycle dealers.
The 915 and 916 are not listed here because the engines were launched after the introduction of the Rotax spark plugs and there is no information about other spark plugs.
Introduction of new spark plugs in March 2017 for all Rotax engines
With the SI-912-027,SI-912 i-013,SI-914-028, a standardized spark plug was introduced for all Rotax aircraft engines.
A cylinder head with a modified spark plug thread was introduced for the 582. See: SI-2ST-010 .
This is a spark plug with 2 ground electrodes.
The tightening torque of the spark plugs is 16 Nm for all engines.
I personally
have the following concerns when using Rotax spark plugs in engines with such different outputs:
A lack of adaptation of the Rotax spark plugs to the thermal conditions by selecting appropriate heat values for the individual Rotax engines.
It is not possible for a spark plug in the 912 80 PS (NGK heat value 7) to reach its self-cleaning temperature in the same way as in the 914 (NGK heat value 9) or in the 912iS and 915/916iS injectors. As far as I know, there is no spark plug that covers such a wide range as the Rotax plug does.
Not even sliding spark plugs, which are mainly used in racing, are available with only one heat value.
Here is an example from the NGK catalog. Heat value 9 - 11.
**In order to be able to continue to install NGK spark plugs, I recommend visiting the nearest competent motorcycle dealer.
Designations of NGK spark plugs
Again and again, the designations on the NGK spark plugs give rise to wild speculation.
Here is the overview table to shed some light on the subject.
not for flight
… In the long term, this imprint on the NGK spark plug packaging was the reason why other spark plugs have been available since 2017.