The latest issue of RCM has an article about upgrading a Kyosho F-16.
They talk about a Kyosho 550 motor and Kress jets installed ball bearings and some different brushes.
They don't give any information how to get ahold of Kress Jets.
Do they have a web site?
It'supposed to triple the power. I have a Kyosho T-33, I think it would be the same motor/fan and would convert the same.

Appreciate any information.