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Hey man thanks, you've been a huge help here. Those numbers look much more reasonable. I called a local motorcycle shop and they thought it sounded like an issue with the stator, so thats what I'll try and replace next.

Would anyone be willing to measure the current they get on their own bike? I replaced the regulator which has gotten the voltage to behave, but I am still seeing 4-5 amps go into the battery. This would mean putting your meter in series with the battery. If you have a smaller meter with a 10 amp...

It's been a few years now... how did the adjustable regulator work out on the XS400 and of greater interest, where did you buy it? I need a regulator for my '81 XS400.

Mind posting some pics? 25$ sounds like a nice option

Hey that was good advice about cleaning up some of the electrical connectors, now I am getting too much power! Reading upwards of 15V across the battery. Current now coming in between 3-4 amps on the throttle. I guess my regulator isn't so great after all. Seems to occasionally cut in as I will...

Good idea. Looks like someone has done some rewiring prior to me owning this thing. No physical fuse box (just inline fuses). I'll go through and clean up all the important looking connections, make sure everything is snug. Also, did they purposely design that battery tray to be hella annoying...

Hopefully someone with rebuild experience chimes in, but were you able to get any compression or leakdown numbers before the engine teardown? Was the bike previously running? What lead you to the rebuild? Curious to follow this as I would like to look into my top end, but I think from what I...

On the left side of your engine, near where the chain comes in and out, there is a rubber cap. Pry it off and you will see a nut and a screw head. Loosen the nut and turn in the screw till you feel some resistance, then back it out a small bit and tighten up the nut. Lots of videos out there on...

Well I got a bit delayed by the development of horrible pops from the exhaust. Turns out my one spark plug died. With the headlight I am still drawing a steady 5 amps. Is it possible my headlight is too efficient/modern? I am using a 9003 bulb (55W). Would my alternator put out less power...

Thats so obvious I can't believe that didn't occur to me :doh: - especially as I saw the brake light drawing a good 5 amps. Doesn't exactly explain why the first battery died as I had a headlight at that point but oh well. I'll report back tonight.

Hey all, first post here. Have an 81 xs400 heritage special that I have slowly been getting ready for the road. Over the course of tuning the carbs I burnt out my first battery that I had bought for it. Didn't worry too much as the voltage never quite got to 14.5 V and it was a cheap battery...

Is the clutch adjusted correctly? little to no resistance on the kick starter if it is too tight.