Ravivos

You do not have a GT2 buy your description , early when the GT was out on the market Horizon came out with a bulletin stating they had problems with that ignition on 4.8 v and that it needed at least a 6 volt and you could use a 7.4 lipo un-regulated with no problem. Not long after came the GT2 with a newer ignition

How long did this engine run good on 4.8 before it went bad????

you might try a 7.4 lipo on the new one.

I will call Horizon on Monday for you and post the results here, check back.

Dave