i get them calls every once in a while, think it was last week i got a couple of them on one day, recognise the number and pick up and hung up imidiatly. now they started calling with a different number i usually ask them if they have a cactus nearby to stuff up where the sun don't shine
depends how much amps you blast through, you could use a car battery charger and wait around longer. or use a dc stick welder and blast lots of amps through and wait and hour or two
fastest thing you can do to get more power out of that engine is removing it and put a bigger engine in place instead. offcourse you can rule out the governer and risk over revving it till the build in rev limiter kicks a hole in the engine.