Is the 912 zero balanced?

Smooth running engines come from balanced props, proper gearbox maintenance, carb sync and replacement of rubber engine isolators during the 5 year rubber change and making sure the isolator bolts have enough and proper torque. These engines have been running worldwide for decades with a proven record for longevity PROVIDED people do the correct and timely maintenance and don't think they know more than Rotax and alter things. This is where the huge majority of problems come from. This has also been an issue with the aircraft Mfg's that think they can re-engineer the engine and its parameters. 

Brian FitzGerald wrote:

Well Joe, if that is the case, it looks to me like you answered your own question. Right?

I know for a fact that the 503 isn't but I heard online on some other forum that the 912 isn't as well and that cuts into reliability (I know they are very reliable already) but it's not something I know for a fact which is why I asked.

My .02 cents:

The 912 is a very solid and reliable engine.

912 reliability is normally determined by owner and or mechanic maintenance. That includes aircraft Mfg's that try and modify engine installs. There have been several aircraft Mfg's that have caused their own problems. There are many examples of aircraft Mfg's making big mistakes over the years. In anything Mfg'd by humans you can have a failure along the way. That's in anything made by man. We've all had things go bad in our lifetime. The big but here is that I have seen owners and have friends with 3k - 4k hours on their engines. Why because they maintain their engine according to Rotax. They don't try and think they know more than Rotax and make modifications and they do the prescribed Rotax maintenance. Like I tell people if you don't know how it works or goes together put it back the way you found it. 

Owners are either the biggest reason engines last a long time or the reason they have issues before their time. Unfortunately there are thousands of examples of this over the decades.

p.s.

These aren't old technology Lycoming and Continental engines so they should not be treated as such.