We have pulled all the connectors apart and cleaned them, they didn't look bad at all just a little green dust build up.. we are still chasing it today.. checked vacuum lines, found 1 broken, fixed it, no change.. tho today I felt overdrive take over at 80 km per hr.. foot on the gas with a low idle.. then minutes later it's back to no overdrive, high rpms at 80km per hr.. I am going to add some Lucas trans stop slip in the morning and drive to my Grandmother's celebration of life.. some chance I may see a change for the better..

It took an automotive electrician5 days to find mine. I have the exact same bus as yours and discovered this issue is common. You might also check all the wires around the engine as I have read of others having the issue and discovering an issue with wiring on the engine. My bus had a new transmission so it was ruled out. You have the exact same issue I and others described.

The intermittent running well followed by the overdrive issue making it feel like the transmission is slipping. The first thing I did was have a transmission specialist look at it and he confirmed there was no issue with the trans. After the electrician fixed the wiring I've had no more issues with that.

@@themightydonallan Keep another fuel pump with you as the pump in the tank has a tendency to go out/have issues which causes vapor locking. Which is another common issue with this bus.

@reggieh1372 right you are!! I literally spend 5 weeks battling fuel pump and sending unit in the spring of 2023 driving across Canada and back.. changed both out when we got to medicine hat alberta.. fingers crossed that I am not gonna have to deal with that nightmare again for a while.

Thanks for stopping by! Cheers!

Thanks for watching! Just learning as I go!

10-12 mpg.. I have overdrive trans and I put a new engine in it 6 years ago.. top speed of 100kmh=65mph..

​@@themightydonallan10-12 leiter per kilometers or U.S. gallons per mile ? A 460 is usually 5-6 Gallons per mile.

@MacGyver2154 I have calculated 10 -12 mpg in the past. You really gotta be light footed hanging out jist under the speed limit on the hwy.. as soon as you get a little aggressive, your fuel mileage goes out the window.. I am currently battling with the transmission as I have lost my overdrive gear.. drove from BC to Ontario in 3rd gear over 2 days. I didn't calculate my mpg's this time, but it cost an extra $300 in fuel!!

@MacGyver2154 I have calculated 10 -12 mpg in the past. You really gotta be light footed hanging out jist under the speed limit on the hwy.. as soon as you get a little aggressive, your fuel mileage goes out the window.. I am currently battling with the transmission as I have lost my overdrive gear.. drove from BC to Ontario in 3rd gear over 2 days. I didn't calculate my mpg's this time, but it cost an extra $300 in fuel!!

Thanks so much for hosting us! It was a fantastic alternative to canceling the night! I'd love to come back and party til the cops come again!

It was a highlight for sure!

Thanks for watching!!

Thank you Mother!

Almost wrecked into the bus!!

Hell yeah Brother!

Tough to find anything about xs400 on youtube.. thats why i posted vids of myself fumbling through this project! Good luck in your search Sir!

Thanks for helping with this comment b.s., sending replies out now!

This is my first street bike and i have had it for about 2 years now! I love it for around the city but want something bigger to keep up with all my buddies that do highway rides.. looking at a Yam vstar 950 for next spring! Thanks for the comment, i just figured out how to turn them on!

Thanks for the comment! I just figured out how to turn them on.. This build (xs400) is going slow, waiting for a welder to repair the twisted frame (papered) that came with the box of parts.. hopefully soon, so i can assemble over this winter!

Thanks for the comment! I just found out how to find them and turn them on!! Yes, this was my first time setting valve clearance and found it to be fairly straight forward.. just waiting for a welder buddy to get my bent frame straigtened out so i can assemble over the winter. Have you tried setting your valves yet?