ORIGINAL: opjose
Yup I did what John shows in his picture above.... two packs wired in series for more voltage on a Heavy Duty Hobbico starter.
BTW: Some guys take these starters up to 22v w/o problems...
This works great starting 50CC engines and most of my gassers that are of that size or smaller.
It is ESSENTIAL that you also increase the cone size for the larger engines.
A small metal and rubber cone does not exert the leverage needed even with the increased voltage.
A larger cone has a longer lever moment making it possible to turn over the larger engines.
Fortunately Hobbico sells larger cones for their starters.
Yep, I've been using 2 3s 2200 lipos (22v) on my regular torqmaster 90 for awhile now with no ill effects. It can start anything I've got with authority. Granted I only do short bursts, but that's all I need.