Hello,
Has anybody started a Rotax 912 engine without the propeller installed or have any advice wether this can be done without damaging the engine?
Cheers
Murray
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Re: Start engine without propeller installed
by Kevin Stewart » 3 years ago
Yes I have. I didn't do it for very long. The engine gets hot quite quickly, it is very easy to over-rev it and it misfires due to the lack of load. Just be careful with the throttle, it will rev up very quickly.
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Re: Start engine without propeller installed
by Roger Lee » 3 years ago
Not the best thing to do. Can you put it on a stand?
Roger Lee
LSRM-A & Rotax Instructor & Rotax IRC
Tucson, AZ Ryan Airfield (KRYN)
520-349-7056 Cell
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Re: Start engine without propeller installed
by Garrett Wysocki » 3 years ago
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Re: Start engine without propeller installed
by Murray Parr » 3 years ago
Thanks all, looks like with care it is possible, I just have to decide if it's better to wait. I was going to try to start the engine for the first time in 5 years & tune the idle mixture to be close to running smooth. Hard to do the mixture with prop spinning. I have a Rotec TBI installed instead of the 2 carbs.
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Re: Start engine without propeller installed
by Rotax-Owner » 3 years ago
Do not attempt to run the engine without a propeller as it will take half a second to over-rev and send the valve train into twilight which will result in your pistons impacting your valves.
100% not worth the risk!
The Rotax installation manual states the following:
Never operate the engine without a propeller as this results in serious engine damage from overspeeding. Never fit the propeller directly on the crankshaft.
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