Stihl MS660 big bore conversion.
I've just been given a 66 cc Stihl big bore engine, still in the saw. The saw is a MS660, if that helps with engine identification.
I am in the process of stripping all the saw parts off it and plan to convert it for aero application. I plan to build a tug plane for towing thermal gliders. I will probably open a separate thread about the design and build of the plane.
I've searched this thread and could not find a thread describing a conversion of this model engine. Has anyone done one of these?
If not, any tips about similar conversions will be most welcome.
This engine has the magneto mounted on the plastic saw body, so a conversion to CD ignition with a machined prop drive shaft is indicated. It will also result in less weight, another advantage for a plane motor.
I have read a cautionary note about cutting the alloy on these saws as they are (allegedly), magnesium alloy and it may be dangerous to do so. Can someone validate or dismiss this and clarify with all precautionary details please?
Jim.
Last edited by w8ye; 01-02-2016 at 07:17 PM.