ORIGINAL: Popriv
I'm running an older hobbyco deluxe 12v starter with a Zippy, 3s, 2650 Lipo.
Worked fine till the weather got colder, now it wont turn over my .40 - .60 glow engines
Have you load tested your battery pack?
It should turn over a .60 just fine.
Remember the torque available is directly proportional to the lever moment...
That means a larger driver cone will grip the outer part of the spinner, imparting more leverage.
I always use the larger driver cones available from Tower, for anything over a .50 size engine.
Also could it be that your ENGINE is the problem?
If it's been sitting cold for a while, the engine may be much harder to start.
ORIGINAL: Popriv
would putting 2 batteries in series burn out the starter? ( 22.2 volts in a 12 volt starter )
would it give the starter more kick?
I've done it and it works fine... however here is a caveat.
The reason it works fine is that there is normally no load on the motor, so the wires never have a chance to heat up.
At the higher voltage heat builds up more quickly, so while you'll get extra "uumph" out of the motor, you must be VERY sure that you use this force very sparingly.
e.g. don't go trying to start a brand new 100cc engine with that, though you should be fine with 50cc engines...
I've also used 14.8v LiPo packs that are past their prime, and this combo works great for engines shy of 50cc.