ORIGINAL: aeroparts
This is a known problem , we have had the same problem.
We had the problem already during running in.
The lower bearing is broken.
MVVS change the design to stronger one.
We got outstanding support with the problem with our engine from Pe and MVVS.
Here is some video of the engine performance.
http://www.junkshop.nu/flyg/imac_20080712/imac5_big.wmv
Lennart SWEDEN
Thank you for the information. I'm hoping that Pe' can give us some advice on how to accomplish the repairs.