YS 160 DZ

[Zoro1024 at aol.com]

Troy,  Do you have any answers for why almost every time I send them  back, 
they need new rings and bearings.  I've been using Magnum DZ blend  30%.  I've 
probably got a couple hundred flights this summer also, but it's  taken three 
engines to do it.
 
 
 
Mike
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