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It was running just a couple of weeks ago, but I was not present when it was running. So I don't know exactly how well it was running.

Probably 60. I'm still hearing from other people "kick it until it stops rising" which puts them both at 145.

Hey guys. I'm back. Quick question about compression tests on these kick only bikes... For a kick start only bike, how many times should you kick it over for a compression test? 1) First article I read said that you should only have to kick it 3 - 5 times to reach maximum compression...

Any advice on removing that oil seal? The one on the KZ400 was impossible to remove without splitting the case. Hopefully this one is easier? Couldn't find it in the manual and haven't seen any instructions online. Hoping that it's as simple as a circlip...

Oh yeah good point. I'll look into that. I can always have spacers machined if it's wider.

It's me again. So the bike I'm working on, as mentioned before is a 1979 XS400. I'm considering a front end swap for a single disk 17" spoke wheel to match the spokes that are already on it. It looks like the forks on the XS400 and the KZ400 are both 33mm. In my mind, all that this swap...

Cool thanks.

Looks like it's #15 here? http://www.yamahapartshouse.com/oemparts/a/yam/50041ceaf8700209bc786280/clutch

Awesome. That was my assumption. Where did you order the new seal from?

Okay, so the 1979 XS400 that I'm working on has been leaking some oil. I checked it out and it looked like it was coming from inside the sprocket cover on the left side. I removed the cover and it looks like an oil bomb exploded in there. So I think I'm on the right track. I had a 1979 KZ400...

Need to track down and fix an oil leak, which I'll start a new thread for, then I'll get it running and dig into the carbs if it's still having issues.

Adjusted the left exhaust valve and the compression is up to 145. So I have 145 on both cylinders. Guess a rebuild isn't in my future after all.

Wet test and leak down are both on my to-do list. Definitely not jumping to any conclusions yet.

Yes, full throttle on the compression test. I looked them up and have read through them, don't worry :) However none of them specifically mention the oil/draining the oil which I thought was interesting. However with a center stand I can see how it wouldn't be an issue.

Yeah I hear ya. Guess that makes sense.

Really?? You're talking about turning the motor over with little to no lubrication... sounds risky to me.

That was sort of my assumption. Unfortunately the center stand was removed from the bike (great)... but I'll just put some boards under the side stand to bring it close to level. I'll end up changing the oil anyway, so I'm not too worried about losing oil. Just don't want to lose it all, then...

Hello group. I've introduced myself, but this is my first question thread. As mentioned in my into, the bike I am working on reportedly had low compression, but ran. Here are my initial compression test results: Left: 110 Right: 145 NOTE: It took about 20 kicks to get the compression to...

Hi there, I have been building bikes in my garage for over 4 years now including a KZ400 (x2), XS850 (x2), CX500, XS1100, and some random work on a handful of other vintage and modern bikes. I am getting ready to get started on a 1979 XS400 for a local guy here so I figured I'd join the group...