Your generator might have an unregulated DC output. As for the 48 volt measurement, that would be unusual for a GOOD battery. I suspect your battery is bad.
If you look up the part for the rectifier, is it described as a "rectifier" or a "regulator/rectifier"? If it's the former, most likely it's unregulated. If it does use a rectifier/regulator, note that most small engines use a "shunting" regulator. A shunting regulator shorts out the alternator output each time it exceeds the regulated voltage. Typically the alternator has a three-phase output, so this happens three times per engine revolution (maybe six times per rev, depending on the design). It takes a finite length of time for the solid state switches in the regulator to turn on, which would explain the spikes visible on your friend's scopemeter. You would not see them if the battery was good and you had a good connection to the battery.
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Today's Featured Article - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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