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Most of my factory plugs worked fine after 45 years so I stuck with those. I bought the Amazon Chinese connector kits (3.9mm bullet connector kit, 2.8mm connector kit and a 6.3mm connector kit) to fix the broken plugs and cut off bullet connectors and they have worked well as long as you...

I can't comment on how difficult it will be for you, but this is the course I would take. The stock wire Yamaha put in is very good and if most of it is fine, then this will be better than buying something that most likely will need some of the same work. Learning the wiring diagram and...

It was pretty warm outside, but I bagged a couple more lighthouses. #3 of 13 is East Point Lighthouse in Heislerville, NJ This is the second oldest lighthouse in NJ and is still in active use. #4 of 13 is Cape May Lighthouse in Cape May Point NJ By my thermometer, the temperature driving...

As far as matching tires, the only company that makes a tire model that is in the stock size range for the XS400 with 18" front and 16" rear wheels is IRC. They have two tire models that will work: Durotour RS-310 (90/90-18 front and 120/90-16 rear) GS-11 AW (3.00-18 front and 4.60-16 rear) I...

4T4 is a 1981 XS400SH

I can help on the VIN and model question, maybe. XS400H will have a front drum brake, the SH will have a front disc brake. Your 9 digit short VIN is made up of the model type code followed by the serial number of the bike. Model type codes you might have include 4R4 - US market XS400SH from...

90/90-18 front, 120/90-16 rear. Don't know about wider in front.

First thing to know is that in North America, two models were produced and sold. The XS400E had everything electrically and the other model, the XS400-2E, was similar, but did not have an electric starter nor the self-cancelling turn signals (as far as I remember). It was the same for the 1979...

I don't have any experience with lithium batteries in this application and you would have to read up on it to tell if it is outsmarting the troubleshooting here. What was the battery voltage without the bike running? 12.7 to 13.5 volts sounds low for the regulator to be working, but if it is...

On a stock bike the orange attaches the right-hand coil to the points or TCI and the grey attaches the left-hand coil to the points/TCI.

You are welcome. No issues. You are attempting to bring a dead bike back and that is good enough for me. Please do. This will be important knowledge for the forum. Plenty of people have posted with various regulator issues and there are some tried and true solutions for installing a...

I have the factory electronic ignition, so don't have super great knowledge of the XS points ignition, but this looks like the cam that the points ride on to open and close. My two cents anyway if no one with good knowledge responds.

I will give it a shot. I don't know if the newest reg/rec will work (not a lot of specs and info is given for it), but I can probably help with how to hook it up to try it out. Not having the factory wiring harness might make this more complicated as we could go by exact wire colors if the old...

For anyone looking for a well cared for, turn key vintage ride, these bikes are the deal of the century. Seriously, don't sleep on these. @xschris - sorry to hear news that necessitates the sale. Best wishes going forward.

The part numbers that will work are 256-14997-00-00 or 2A2-14997-00-00 (one might be cheaper than the other from Yamaha even though they are the same). There are two in each carb, so you will need four seals total. When removing the screws on the butterfly it is very important that you use a...

Lighthouse 2 of 13 is the Finn's Point Rear Range light in Pennsville, NJ: Nearby is Fort Mott which along with two other forts in and across the Delaware River guarded the approach to Philadelphia during the American Civil War. Also there is a small national cemetery with the graves of a...

There is a series of rides I have always wanted to do on a bike. There are a number of lighthouses in New Jersey and by my count, 13 can be visited on land. It will take a number of rides, some of them pretty long days using the routes I like to ride. The first window of opportunity presented...

The bike is a 1981 Special II, and the exhaust is from MAC (I don't believe it is produced any longer). This exhaust was installed on the bike when I bought it, so it got refurbished when I put Trusty Rusty back on the road. The seat was reupholstered by me, not a great job, but good enough -...

Sounds like a voltage regulator issue if the bike dies after a while. You should put a volt meter across the battery terminals while the bike is running and it should show the DC voltage just over 14 volts. Reving the throttle should produce an increase in voltage, but it should not go higher...

Reality check - you are really going to have to sort this out yourself. You may end up with +1 or +2 on pilot jets, maybe +1 on the main and also need to shim your needle some. But who knows - only your bike with tell you the answers. The truth is that no one on here will have the exact same...