guys,

a couple of you are saying that the batteries weigh a ridiculous amount, but I was wondering why don't you just get two 7.4v nicd packs from radio shack, run them in series and carry that. they are not that heavy and you probably could get by with less than that seeing as you are only using it for one start (maybe) two in between charges. I run this setup on my cordless ground starter and it works for 2 weeks of hard use before recharging. you could probably pick up a 1000 mah 11.1 volt lithium battery from apogee and use that as it will be enough to crank you 70 size engine provided it is geared right. This would be very light and get you a lot of starts. it would only take one battery to do the job without the weight of 2 batteries run in series. i can't help with the weight of the starter. my other suggestion would be to use a smaller engine and thus a smaller starter.