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Popped off the valve cover to see what was up and holy shit... All the bolts for the cam caps for loose as hell, has this happened to anyone? Little lock tight on the bolts, battened her back up, and seems to run perfectly. Thanks for the help though, the valves turned out to be within...

Hey yall. Just rebuilt the engine on a DOHC 1982 xs400 (xj I believe). Honed cylinders, new piston rings, new valves and springs, cleaned everything up and lapped/mated valves. Started her up immediately (after 4 years of sitting) and was super excited. As I started to rev her up though I...

Any advice on timing?

Yeah, that's what I'm thinking. Good advice, thanks.

Still lookin for some help.

Not yet sure if it was valve clearances, but I broke a valve, so it's definitely valve/piston collision.

Awesome, thanks guys.

Hello everyone! So, I rebuilt the top end of my 1982 xs400 Maxim, and have been having some troubles. Pulled her apart and found that my intake valves have been banging on pistons, and the rubber end of my cam chain tensioner has been shredded. I had a lot of trouble on the rebuild getting...

It's got 34k on it so I wouldn't be surprised if the valve clearances were way off.

Dohc, 1982 xs400maxim

Not sure about the oil. I actually didn't know there was 4stroke oil that DIDN'T work with wet clutches. I'm just wondering if it's springs or friction plates or both. Is there a way to tell with out popping it open and measuring the plates?

Like cylinder one side? If so, already have.

Hello again yall, got another question for ya. My clutch is funky. It only engages at eh VERY END of release, and when you really open the throttle up, it slips (engine will rev, bike won't accelerate). It's fine however at lower throttle. The adjustment for the lever does not affect it...

Lean issue is fixed, had to do with the carb boot petcock connection. Still taps like crazy though.

Carbs are all clean and synced, idle screws are 2.5 turns out. Brand new air filter.

Also, are you talking valve clearances?

The bike is also running very lean

Hello everybody, I'm new here and have a couple questions. Purchased a 1982 xs400 for $200, and just finished rebuilding the top end. Among many other fuel air issues I'm hearing a lot of engine noise. THe bike was not running when I first got it (obviously) so I'm not sure what it's...