Hello Jster,

Sounds like your on track to fix your ZXX. Im curious if the clutch liner was ever replaced and properly bonded after it came loose initially. I had a friend at the field who once bonded in his liner without properly taping the clutch and installing the taped clutch inside the bell to hold the liner in place until the JB weld cured. He also ended up with a tight clutch that caused him a great deal of vibration. I'm curious if the clutch problem you had initally did some vibration damage to the receiver? The bell coming loose from the spindle is very suspect to the liner not being bonded uniformly.

I recently had my clutch bell (steel type ZX one piece) crack out around the spindle to bell spot welds. I pulled the engine and did the hub runout check for the heck of it. This heli was an ebay special and I wasnt the one who put the fan hub on. I was astonished to find almost .006 run out on my fan hub. The ZX fan and hub do not screw on, they just slip over the engine shaft and the nut holds the works in place. I used a few wraps of tape to help hold a better center as I bolted the hub/fan back on and was able to get .001 after a few tries. I then dial indicated the clutch itself right at the fixed portion where the two main attach screws go in. I found .003 offset here. Pulled the screws and turned the clutch 180 degrees and the run out went to .000! Needless to say I have a substantially smoother engine and the gyro holds better now that the vibes are under control.

While your waiting for your receiver you might want to replace that whole clutch liner, check clutch bearing, and dial indicate the clutch/hub/ fan runout. The ZXX might have a screw on fan with collets which makes for a much more precise centering.

When things are turning 17,000 rpm, the things that I used to think really didnt matter that much ..........really do matter that much!

Hope you get things up and running Shuttles are alot of fun!

Tony