ROTAX Engine Type 912 and 914 Service Information

This SI revises rotax SI-912-032 / SI-914-033 / SI-2ST-011 dated 20 February 2019
Running modifications of the Bing constant depression carburetor for ROTAX® Engine Type 912 and 914 (Series) and 582 UL mod. 99/mod. 17 (Series)
ATA System: 73-00-00 Fuel system

Planning information
To obtain satisfactory results, procedures specified in this publication must be accomplished with accepted methods in accordance with prevailing legal regulations. BRP-Rotax GmbH & Co KG cannot accept any responsibility for the quality of work performed in accomplishing the requirements of this publication.

All versions of ROTAX engines types

Engine type	Serial number
912 (Series)	All
914 (Series)	All
582 UL Mod. 99/Mod. 17	All

Concurrent ASB/SB/SI and SL
In addition to this Service Instruction, the following Service Instructions must be observed and complied with:

• in general all relevant Alert Service Bulletins (ASB), Service Bulletins (SB), Service Instructions (SI), Service Letters (SL), Service Instruction Parts and Accessories (SI-PAC) with relevance to perform this maintenance, repair or overhaul task.
• SI-912-012 /SI-914-014, title “Routine modifications of the Bing constant depression carburetor”, current issue.
• SI-2ST-005, title ”Running modifications on carburetors”, current issue.

Reason
In the course of continued development and our commitment to product improvement, changes to several carburetor parts have been introduced.

General information
The modifications do have an effect on individual part changes and have been introduce in the different carburetor serial number ranges. Due to the relevant logistic chain the modifications were introduced as a running change in several steps and different carburetor serial numbers. For detailed information see the following section. The various modifications need to be considered during the next repair work / major overhaul.

Gasket for float chamber
The material of the float chamber gasket was changed to a Viton based material with new part no. 830721 and 830722. This new gaskets can be used instead of previous paper or cork gaskets part no. 830720 / 830724 / 830728.

Throttle valve levers
Throttle valve levers (1) were changed to a pressed notch style which provides improved connection to the throttle valve shaft. For the revised throttle levers part no. 963026 for the 1/3 carburetor and part no. 963021 for the 2/4 carburetor.

Float chamber assembly
The float chamber assembly has been changed from Zinc die-cast material coated with a sealing agent, to anodized Aluminum die-cast material. This provides better resistance against contamination, such as aged fuel or water corrosion etc. Part numbers for the revised float chambers are listed in section 2.4 of this Service Instruction.