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OK, second post in as many hours., but just received an email of dismay. I have a leaking petcock diaphragm. This is an issue as I have the stock Keihin CV carbs and no diaphragm means no vacuum. I've been riding on Prime and turning the petcock to On when parked. Works, but none too...

Having just finished a pretty big rebuild on a '78 KZ400 I've been riding the beastie around working the bugs out and finding all the little problems I didn't catch from before (like a bad petcock diaphragm). One recent observation, is smoke from the valve cover after the bike has been running...

I'm hoping for a little guidence from folks who've ditched their stock airbox. I am ordering pods for the carbs and I've been digging around looking for the cleanest solution to the valve-cover breather on my 78 KZ400. The question is what to do about the valvecover breather hose. There is a...

OK, been messing with this machine since June, and knew I had big plans but didn't want to post here until it qualified as a big-arsed project. Well, I think the time has come. It was a good 50 footer. I actually liked a lot about it as I bought it (for $350). It had some issues however, and...

New to the site and been spending a bunch of time thinking about how to mount rearsets on the machine, (especially as clip ons are on their way from Fast from the Past). Has anyone created mounting brackets for a KZ400? There aren't a a lot of mounting points near in the area where I think...

Hi, Just found the site. Currently in the early stages of building a racer out of a '78 KZ400. The bike was rat racer'ed, and had also been down but the damage is minimal. Picked it up for $350, running, but hardly perfect. Looking to old race bikes as much as old cafe's for inspiration...