Two General questions '86 400 WR

I've got two questions I've been contemplating, and I'm pretty sure some guys on here would know.

1) '86 WR 400. Standard WR fuel tank, no auxiliary tank. What's the fuel range on a single tank?
2) Same bike, 3rd gear is starting to slip out, so I'm assuming the dogs are worn on primary shaft 3rd gear. Do you replace just the 3rd gear, or do you do the 3rd and the double, and what about the gear on the other side of the double that also dogs into it? Seems like most of the time, when you replace one piece of worn metal the 'conventional wisdom' is to replace what it interfaces with as well, but by that logic, it doesn't take long to convince yourself to replace the entire gear-set.

On my 86 400 basket case 1,2 and 3rd gears were bad. Plus bent shifting forks. So be prepared to replace more than what you are thinking.
Sorry for the bad news Eric. Good news is you might be able to find transmission parts on e-bay. I got a perfect tranny for cheap. I bid $ 20
and got one. I love looking for deals so I will help you find one if I can.

all that should be needed is both 3rd gears. inspecting the others is a judgement call. its common for 2nd and 3rd to wear out.

I've had the bike for years, granted I picked it up as a kid and wasn't the best on maintenance or gentle use, I did maintain (not the best was not none) for the most part and haven't had any major 'events', for now I will remain hopeful, I've got a spare bike and some projects in the hopper so don't hold your breath waiting to hear an outcome on this thread.

Anyone have any ideas on the other question? Fuel range on the 400 with WR tank?

For the record, spare bike is to ride, not for parts...

As for fuel range, I've seen an '86 WR400 go well over 100 miles on the stock tank in the desert. I actually ran the same bike out riding hard at about 80 miles.

My fuel range on my 86 was very similar to yellobronco's comments.
Tony.

In the woods, I can only get about 45 miles out of the stock tank on my 1986 400.

80 - 100 kms is about normal (50 - 60 miles) but very susceptible to riding conditions slower woods style uses way more than open desert as you tend to be on the needle in the desert in higher gears while in the woods your wfo ( main jetting) in the lower gears a lot more.

If it is popping out of third a better double gear it pegs to would be in order. My experience has been some of those third gears have bad tooth faces, so. Use double one out of that. The wide ratio was still mostly same parts for another 10 years Approx.