I am having a problem with my Saito 100 on my UCD3d. I have had this problem with both a bladder tank, and the regular stock tank, so I know that this is not a tank problem.

I have the engine on a cline regulator, about an inch and a half from the carb.

Whenever I pull up sharply, and encounter a large positive g force, I will get a dead stick engine. I have been having to be careful not to do this if I want my flight to run the whole tank out. I have checked to see if there is any kinks in the fuel hose that would close when the tubing is pulled on, like in a high g pull-up, but I do not think that is what is happeneing. The Saito is in the standard UCD3D mount, inverted.


Why is this happeneing? Is the cylinder being flooded momentarily? The engine runs perfect except for this. Great idle, great instant transition, great WOT. Has anyone else seen this problem?

Thanks

I've got the same setup, but not the problem.

The directions to the Cline say max 1" from carb, I believe. I have a hard time believing that an extra 1/2" is your problem though.

Do you have good tank pressure? Does it happen at all throttle positions?

Good luck ...

I've seen something similar happen to another UCD.

The problem was too much pressure and the high end needle was turned in to compensate. This gave a very sensitive mixture, and actually caused a deadstick that led to a crash destroying the plane. His needle valve was only open about 5/8 turn from fully closed.

Another flyer has that engine now and set it up at about 1 1/2 turns open, then back down the pressure until it runs right. No more problems!!

Just something to check for. Hope this helps.