I brought Home my '77 KZ650 *VIDEO AND PICS*

RonKZ650 wrote: 1977 had the manual petcock, but to use the vacuum one hooking to any of the 4 vaccum sync ports on the intake rubbers works just fine. Your bike is closely related to my 650 in the avatar it seems. Even the same wheels.

Yeah ive decided im going to leave it as is. Who wants the headache of having left a petcock on and flooding the engine?!

And yep your bike looks exactly like mine.

650ed wrote: The original 1977 petcocks turn up on eBay sometimes, but not very often, so it may take a while before you find one. Pingel sells manual petcocks, but you need to make sure the holes for fastening it and the direction of the outlet are correct for your bike. Also, you may need to use an adapter plate. Ed

Ive decided to leave the setup as is.

650ed wrote: Your carbs appear to be the original Mikuni VM24SS units supplied with the bike. They do not appear to have the vacuum nipple – this is normal for the 1977 KZ650 carbs.

The brass nipples that are located on the top of carbs #2 and #4 are vents. They allow air to escape from the carb bowls as the bowls fill with fuel. They should have hoses on them, and the other ends of the hoses should be routed toward the air box and not be plugged or attached to anything. They need to let the carb bowls breathe to the atmosphere.

It looks like you have a vacuum operated petcock; as kevski pointed out that is not stock. Assuming that is true, the vacuum line from it must be connected to a source of vacuum when the engine is running; otherwise a correctly functioning vacuum operated petcock will not deliver fuel if it is set to the RUN position. If you wish, you can attach it to a vacuum nipple on a carb holder as is shown in kevski’s photo. Personally, I would just buy a non-vacuum petcock similar to that which the bike came with – but that’s just the way I am. Ed

Ed it is attached to a vacuum nipple/stub as i indicated in earlier post picture that i downloaded edited then re-uploaded, and you slated the method

650ed wrote: Pingel sells manual petcocks, but you need to make sure the holes for fastening it and the direction of the outlet are correct for your bike. Also, you may need to use an adapter plate. Ed

One note about the Pingel replacements. You need to drill out the tank in order to mount them. They have a round screen tube that is wider than the narrow slot in the tank. I bought one and then decided I didn't want to drill my tank so I never mounted it. Otherwise they seem nice.