I had that happening on my 800; turns out it was a faulty emissions valve. Not sure what we have on the 750s along those lines, but the local shop tested it by blocking off the vacuum supply to the valve (and the bike ran fine).
Turned out to be the battery! load test the battery with a headlight to see how long it stays lit.. then you'll know how good the battery is! if it dies out soon.... time for new battery! If you go looking... it seems Westco is getting a bad name for themselves here!
Would reccomend the Yuasa MF AGM Battery!
Read the above thread and then go out and check yours out again!
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