Its been a long time
Doesn't know nothing.
Making progress with the 77 XS650D I have acquired. Latest foray is into the alternator. Good news is there's no visible oil leaks from the crank seal, clutch pushrod seal or sprocket seal. Quite surprised at that. Front sprocket, nut and tab look fairly recent as does the chain and rear sprocket. However, alternator checks -
I haven't put a battery near the bike yet. I want to be pretty certain the wiring doesn't burst into flames or something before I put a fully charged battery near the bike. I'm not at all confident with electrical items so I've started by checking the alternator out first. The alternator rotor looks recent and the brushes are in very good condition, about 4mm worn. I believe the rotor to have been changed long enough to wear the brushes by the 4mm. The resistance across the copper brush tracks is 5 to 6 ohms falling, no short circuits. I have polished the brush tracks and have new brushes to install.
The alternator stator, looks original 47 years old. It's obviously mucky but not oily or corroded. I put a meter across the three white wires in the outlet harness plug and there's no shorts to earth. There's about 1 ohm between each pair of the three white wires. I don't really know what I'm doing here but with no shorts and consistent readings between the three white wires, it's good to go? I'm not going to attempt to clean the stator windings but might use a paint brush to brush off the worst of the dirt.
I think I'm OK to go to the next step of checking out the rectifier and regulator on the bike now. They are clearly 47 years old. I haven't done this before, so I'm off to see what I can find here about rectifier and regulator checks before I do anything more.
Pictures attached.
I haven't put a battery near the bike yet. I want to be pretty certain the wiring doesn't burst into flames or something before I put a fully charged battery near the bike. I'm not at all confident with electrical items so I've started by checking the alternator out first. The alternator rotor looks recent and the brushes are in very good condition, about 4mm worn. I believe the rotor to have been changed long enough to wear the brushes by the 4mm. The resistance across the copper brush tracks is 5 to 6 ohms falling, no short circuits. I have polished the brush tracks and have new brushes to install.
The alternator stator, looks original 47 years old. It's obviously mucky but not oily or corroded. I put a meter across the three white wires in the outlet harness plug and there's no shorts to earth. There's about 1 ohm between each pair of the three white wires. I don't really know what I'm doing here but with no shorts and consistent readings between the three white wires, it's good to go? I'm not going to attempt to clean the stator windings but might use a paint brush to brush off the worst of the dirt.
I think I'm OK to go to the next step of checking out the rectifier and regulator on the bike now. They are clearly 47 years old. I haven't done this before, so I'm off to see what I can find here about rectifier and regulator checks before I do anything more.
Pictures attached.