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I put in 132.5 main jets and it was running very lean according to the plugs - see the pic above. That was with trying the needle in both rich/lean configurations. Another note is that when I had the 132.5 mains in, the top end lost power and stuttered at full throttle. One thing that I am...

So I've re-jetted and the following runs decently well; I've used GTIDave's Carb risers to space out the UNI filters, and the bike came with a MAC 2-1 Exhaust Mains: 142.5 Mikuni Brand Pilots 45 Pilot screw 1-3/4 turns out from bottom Plug chops at full throttle, and 1/2 yeild caramel...

So - I've done a bunch of work since I last posted. Here's where I'm at right now. currently running 145 Mains, which seem too rich, (I had to drop the needle to the leanest setting to get it to run well b/w 1/8 and 3/4 throttle). Under full throttle it still bogs down a bit. I put in 132.5...

So I flushed the engine with a bunch of thin motor oil, about 5-6 times. Hoping that will have done it. Rebuilt the head and replaced all the gaskets, new rings, new valves, new valve guides, 2 new valve seats. Now I need to order some shims at the moment - anyone have a good Canadian...

hey folks, appreciate the feedback and help. I have one more question before I get to some engine work. I'm new to this whole thing and I made a rookie mistake a while back. When I was pulling the engine apart to look at valves, rings, etc. I didn't clean the engine well enough. There was...

I'm pretty bummed about the spare engine, but I suppose now I'll just have to use it for parts. I ended up trying to seat my valves myself by lapping, but discovered that they were bent. So I decided to have the engine looked at by a local machine shop, they did a great looking job and...

Mild sad news about replacement engine, I was a bit duped as I was told the engine ran.... Clearly a lie as the compression measured 30PSI dry and 60 wet. On the bright side, at least the cost of the engine was about the same price as a new set of valves, which I managed to get out of the deal...

Got the washer out. Kinda messy under there. I think I'll probably end up making a bushing with threads that the swingarm pivot bolt will secure into, though I'd prefer to have some kind of mechanism to prevent the bolt from being able to un-do itself. My pivot bolt had a castle nut on it, but...

OK. Here are some details on the swingarm status. See the images included. Looks like the previous owner for some reason decided to weld on washers onto the frame to reinforce the pivot bolt mount. They however did not take into account that this extra thickness would space the bolt out...

Found the valves from a spare engine. thx for looking!

Thanks for the info on that Dave, good to know. I'm hoping that the cups that the pivot sit in on the frame are aligned, and I'll use them to guide the new material to alignment.

Updates: 1. Found a spare engine (XS400 Seca with 6spd) in apparently running condition (not on a bike, no carbs..) so that's cool. I'll be performing a leakdown and compression test on it to see if it's in better shape than the head that I just dropped off at a machine shop last week :(...

Note that 1J7-12121-00-00 is apparently a compatible part, according to Yamaha.

Hey Folks, Just stumbled across this site, they are in PA. http://store.speedandsportinc.com/ Seems like they have a bunch of things in stock (new) for XS400s. -Robbie

FOUND: XS400 DOHC Exhaust Valve (12R-12121-00-00) Found what Im looking for, thanks for looking.

Does anyone know if there is any validity to replacement valves from an alternate bike, I found this website: http://xs1100.com/partinfo.php?myid=708 It seems to imply a number of models share the same exhaust valve. Anyways, having a devil of a time finding replacement exhaust valves. Mine...

Hey Folks, I'm back from a hiatus. Less one girlfriend, moved a few times. Ready to start on this project again. I've acquired some shop space, and started stripping down the engine. I'm sad to say I'm not pleased with what I've found. Definitely in need of some guidance and mentoring...

Re did the compression test; About 110PSI for each cylinder, engine cold, throttle wide open, no plug in either chamber. If 125 was low, then this is a problem... Hone + new cylinder rings?

What is a leak down test? After I rebuilt the carbs, I sprayed the external housing with carb cleaner, then air to see if the idle changed. It didn't, so I'm hoping that means my Airbox-Carb-Engine interface is sealed properly. Also, I had taken the cam shaft cover off, and the seal was...

That thing is huge, Chris. I'll re-update with the compression when cold, and check the timing as well.