I put one on my Coroplast LA Biplane and had two dead stick landings. I replaced it with a DLE-35ra which was easier for me to adjust.

I still have two of them. One needs new bearings which are available and easy to replace, but I'm lazy and don't need another engine right now. Both have the upgraded muffler. I would have sent them in to have them checked out and if needed reworked, but Todd seems to have gone AWOL. Todd was busy trying to get a government contract for his engines. That would have been where the big money was. I never found out what happened there.

I know that Red Rider was taking over repairs, but after putting the DLE on my plane I lost interest in the Syssa engines since I didn't need them anymore.

I gave Todd the fix to the muffler problem. I modified my first engine and never had a problem after that. He got the mod into production pretty fast.

I had six of them and wore out four them engines. I was getting two to four hundred hours on them before the bearings failed. When I say wore out, I ran the engines to destruction per Todd's instructions. He would send me another engine, or repair mine at no charge. The failures were always due to a bearing. I also went through several ignition modules, all under warranty. The oil I used made a slight difference, Stihl Ultra HP gave me the best life.

The key shearing problem was caused by a vendor who supplied the wrong material. I think all of the engines that had the bad keys were fixed. There were not that many in production at that time.

I've toyed with the idea of trying the A02 ignition module on one of them to see if it would make it less sensitive to quitting in the air. I'm a little worried about the radical timing curve on the A02 though. The A01 ignition modules may be hard to get before too long.