battery

I have a 1981 Yamaha xs400 special 2 and was wondering if I can get some advice on how to test my voltage regulator shown in the attachment. Runs and rides perfectly ONCE started, but as of right now the lights don’t even come on when key is turned. Jumping it does the job and like I said runs...

Hi all, This is my first post and I’m electronically challenged so go easy on me. I recently bought an 81 xs 400 off of Facebook. Bike ran fine when I bought it. Electrical start, lights, dash lights everything worked. The battery died out the first day and wouldn’t charge so I bought a new one...

Hi, I messure 11.4 volts at my coils with the ignition on, and motor off. Battery messures 12.7v Im having troubles with my right cylinder not firing up, and the spark seems very weak when I put the plug against the engine block. i tried cleaning the ignition switch, handlebar killswitch...

Had trouble starting my bike figured "hey I should start with the battery." Lo and behold it started amazing. But I heard some weird tumbling noises, so I hit kill but the starter was still pushing on. Had to unscrew the battery, sparky mess. How'd I mess this up? What is wrong?

Hi gang! Newbie here, first post so go easy on me ;) I'm a metalsmith, not an electrician, and I bought an '81 XS400 Special just a few months back. Just getting familiar with using a multimeter (i.e. check the battery for voltage). Background - It was partially modded to a cafe / rat racer by...

My battery stays at 12.5v for good while when riding and then stops charging randomly leaving me stranded. The stator is good and has new wires. I am using a Rick's reg/rec for lithium-ion batteries and an Antigravity 4 cell. I thought the battery was bad so I bought a new one but it does the...

Hi, I have XS400 Special 1980. I bought a new battery and after 2-3 days of riding, battery dies, the starter doesn't have enough power to spin and after some time it completely stops. I think it is because of the regulator. It is the original one as far as i know. However, shipping from ebay to...

Hey everyone, I'm super new to this forum and super new to the XS400. I recently picked up a 1979 XS400F and the battery is real old, and real dead. I really want to replace it with a maintenance free battery but I can't seem to find one that says it works for the 1979 model. BikeBandit says...

I know i've read threw most of the posts about this, but I just don't understand what is going on. Help me out? The skinny: From engine: Black - field coil ground? Green - field coil 3 whites- ac current I have the r292 VR, the magnet works when energized directly from battery, green receiving...

Heylo. The skinny: I built a cafe racer, eitrd from scratch, burnt out two batteries. I have a combo reg/rec purchased from Ricks. My bike is a 1981 xs400 heritage special. My R.R has 3 white wires, which I ran to the white wires on the R.R, 1 green to the magnet? A brown wire that...

For all the info, please can someone tell me what the stock battery is for the 1979 XS400? I want stock, nothing smaller. Cheers

Okay to start off I just want to let everyone know that I am brand spanking new to motorcycles but I am fairly mechanically savvy. So to start, I bought the motorcycle a couple weeks ago thinking that it ran perfectly, which it did for the 15 minutes they had it running, but after the paperwork...

Hi, I searched for a cable extension thread elsewhere in the forums but couldn't find one so I thought I'd ask everyone. How did you guys manage to move your battery around? I'm trying to place mine under the cowl of my cafe racer seat and it fits fine as far as size, I got an 8cell antigravity...

Brand new battery dies if I don't ride every day?? I can usually get it going after physically kickstarting it. Running the bike will charge the battery for a while it works for a couple of days. Then if I leave it for a while and the battery will have no charge. What should I replace first...

Time for new battery or can I just top 'er up with distilled water? Apparently <1 year old as of PO. All the levels are way different and around 1/2 full or so. Has died 3 times in the last week and a half due due to my cranking over and over while tinkering and not taking her out for a ride...

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Looking for some help. The saga starts two years ago: I was really happy scooting around on my 81 XS400 Special. I rode it for about 6 months... it idled pretty high, but for the most part, it ran just fine. It didn't have an electric starter button, but I rigged one up that worked great. On a...

Does anyone know the size of battery for 1980 XS400? Group number or anything will help! Thanks!

1980Xs400 Special Alright. So original owner swore it ran fine last Summer-October. Get it home, battery seems dead, so just charged it. Let it rest overnight, yada yada. Replaced, and it acts like it wants to start. Go back a few days later using a jump pack and almost the same thing, but it...

Hey Everybody! I was just wondering if it's possible to run a 1981 XS400 without the battery and all other associated components (ignition coil, etc). If my understanding is correct, theoretically, it should be possible to run the blinkers, headlight, and taillight without the battery because...