I got the bike as breaking but with the help of my dad i wired it up and got it running but seem to have the same probloem while it is running it drains the battery and cannot charge itself now i was told it might be the regulator or rectifier but when i look online to buy one of any of these it shows either a black box or silver box which i already have on the bike please help
If not charging then it can only be either the stator windings or the regulator/rectifier. The silver "box" with fins on it is your rectifier. Good chance that's the problem...Try another rectifier and put a multimeter on battery terminals. Check voltage when not running then check with bike running. Fully charged battery should show approx 12.4 volts. With bike running it should show approx 13 plus volts which will tell you that it's charging. Usually it will be the rectifier rather than the stator windings that stops it charging.
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