[NSRCA-discussion] 120 AC issues

[Stuart Chale]

OK this might cause some of you to think back into your memory banks but 
my son is trying to fly a YS 120 AC powered Dalotel.  It was back from 
the old pattern days and I am not sure who made the kit (FG fuse).  The 
motor appears to be in good condition has good compression and starts 
easily.  It runs great for the first 5 minutes or so and then will not 
throttle up.  It has not died but loses throttle response.  It does not 
appear to be too lean and the tank holds pressure.  The motor is not 
real hot.  The cylinder is touchable after landing.  It seems to happen 
consistently around 5 minutes into the flight.  I figured it was a tank 
problem but could not find any  (changed the inside fuel line anyway).  
The problem does not seem to be reproducible on the ground or at least I 
didn't give it long enough to appear.  After landing and not refilling 
the tank the motor seems to run fine and the plane can be held in any 
attitude.  I assume that it must be something happening after part of it 
heats up enough but I do not remember seeing this in my 120 days.

Thanks,
Stuart Chale