914 lockup

Firstly, the propeller shouldn't be turned in reverse of the normal direction of engine rotation, as stated in step 4.3 of the Pre-flight checks procedure in the Rotax operator's manual.

Secondly, it's possible that you have a hydro-locked cylinder with engine oil. As the engine sits for a duration of time, oil could be migrating into the cylinders. However, we aren't aware of any Aircams experiencing this issue. If you want to verify whether you are experiencing a hydro-lock situation, you can remove the bottom sparkplugs and check if any oil comes out. You should also see if you can rotate the engine freely in the normal direction.

If you still encounter internal binding issues with the bottom sparkplugs removed, it would be wise to contact Lockwood Aviation and discuss this situation with them. They are not only the sellers of the AirCam but also the Rotax engine, and they can provide valuable insights into your specific situation.

https://lockwood.aero/

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Kevin i have a question...do you use 100LL?  Engines that have run only leaded fuel and without anything like Decalin in the fuel can get lead buildup in the cylinder head.  if you are in a very moist environment this lead deposit can come loose and get trapped in between the piston and head.  Turning it backward got it moved enough that you overcame the lock in the head (if I am correct)  

So, first check the cylinder for an oil lock from sitting as Rotax Owner pointed out.  If you get oil coming out the spark plug hole you need to solve that.  If you get a bunch of small chips of tan/yellowish chips you have lead deposits in the head.  (suggests over rich operation also) 

Let us know.

Cheers

I do not use 100 LL at all.  The eng does not turn freely in the proper direction at all.  Thanks for the ideas.  

I do not use 100 LL at all.  The eng does not turn freely in the proper direction at all.  Thanks for the ideas.  

I do not use 100 LL at all.  The eng does not turn freely in the proper direction at all.  Thanks for the ideas.