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I’d suspect the batteries first too. A weak battery can show 48V sitting still but collapse under load like that. Since you tried another pack and got the same result, I’d check each battery individually under load and make sure one isn’t dragging the whole pack down. Also check the battery...

Sounds like the batteries are probably toast. Lead acid batteries really don’t like sitting discharged, especially through a Michigan winter. The 7V reading after charging is a pretty good sign one or more cells have failed. I’d pull the batteries and test them individually. If they’re SLA...

The chart is usually just a starting point; real-world setups can vary with clutch position, pulley alignment, and belt brand. If the belt has no slack at rest, it’s likely too short. I’d double-check the center distance measurement and alignment, then try the next size up.

Going from a 72T to an 80T rear sprocket will help, but it’s not a massive change. Your ratio would increase by about 11%, so you should feel a better launch. If you want a bigger difference, look at reducing tire size or going with a larger rear sprocket, but make sure you don’t overdo it and...

A CDI buzzing like that usually points to a power/ground issue or the CDI not getting the correct voltage. I’d check the battery voltage, grounds, and wiring polarity first. Also make sure the CDI type matches the stator (AC vs DC CDI), as a mismatch can cause strange behavior.