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rotax 4-stroke - carburetion
912UL, 912A, 912F, 912ULS, 912S, 914UL and 914F Engines
All information provided here is correct at the time of publishing to the best of our knowledge, but Rotax recommendations may change at any time without our knowledge. It is the engine owners responsibility to ensure that the engine is fit for flight at all times. The information is provided here free of charge and with no obligation from us to the consumer. To ensure that you have the correct and most up to date information, you should refer to the current Installation, Operators and Maintenance manuals for your engine. The information provided here may not be valid for aircraft outside the UK. Click here for ConAir SportsTerms& Conditions, including website usage policy.
carb heat
SKYDRIVE COOLANT CARB HEAT
Installs onto carb bodies and uses hot engine coolant to warm the body of the carb without any power loss. Fully automatic - removes the need for pilot intervention.
The Skydrive coolant carb heat for 912 & 914 series engines weight 700g including pipework.
HOT AIR CARB HEAT is an alternative option - each system varies with aircraft type.
Carb synchronisation is vital. Please read the section on carb synchronisation is our maintenance article here:
Most of the things you wanted to know about servicing a Rotax 912/914 series aircraft engine but were
afraid to ask - article by Conrad Beale, as published in LAA and Microlight Flyer magazines.
Carb synchronisation is also well described in the following articles by Philip Lockwood from EAA Sport Pilot Magasine:
Power On - Reaching Smooth Idle Part 1 Power On - Reaching Smooth Idle Part 2
Carb balancing is relatively simple with the correct tools....click here....
- Ensure that both throttles and chokes operate simultaneously through the range
- Synchronise carbs at every service (see above)
- If carb synchronisation varies at different rpm, the cables are sticking and need to be replaced
- It is vital to keep carbs clean - use a gascolator and clean fuel. Clean / flush fuel lines if you detect any contamination
- When inside carbs, be clean and meticulous
- A bad mag drop can be related to carburetion
- Check the float bowl level after running the engine; the fluid level should be 1/8 inch below the edge of the bowl.
- The float height is critical and should only be adjusted with reference to the float height gauge - see the Heavy Maintenance Manual.
- Remove carb rubbers and check for internal splits
- Followmaintenance specified in the Line Maintenance Manual
- Replace carb diaphragms and carb rubbers every 5 years.
- Vibration causes excessive wear on needles - change needles and needle jets as a set, change when engine burbles in the mid range, they will generally last about 600 hours but should be inspected every service.
- Check float bowls for contamination at least every year.