What type of carbs are these?

Helloooo Everyone,

I just got my first bike.. an old 77 kz650.
The floats are leaking BAD all over the place. I'm trying to figure out what type of carbs are on the bike, they're def not stock.. check out the pics and tell me what you think.

Thanks!

Mikuni 29mm smoothbores as best I can tell

dont see any drain spigots so im going with mtkawboy on 29mm smoothies. Hard to find parts for those carbs so be careful w/em.

MAv wrote:

Helloooo Everyone,

I just got my first bike.. an old 77 kz650.
The floats are leaking BAD all over the place. I'm trying to figure out what type of carbs are on the bike, they're def not stock.. check out the pics and tell me what you think.

Thanks!

Hello, MAv. Welcome to the site. We're glad you're here!

The larger disconnected black hose at the bottom of the photo is the fuel line. The outlet side of an inline fuel filter should go into the open end shown in the photo. Another length of fuel line should be added between the petcock and the inline filter.

The top two smaller clear (yellowed) hoses are vent lines and should not be connected to anything. They are supposed to be vented to the atmosphere. Could allow them to just hand free, but better to route both of them to up underneath the seat, but some folks route them down around the swing arm to underneath the bike.

Without an overflow system, these carbs may allow fuel into the crankcase. Should be careful about that aspect. Would sniff-test the oil for any gas odor. If contaminated, change both oil and oil filter.

Should also have an air filter, either airbox or pods. Absent any sign of the oem airbox tubes, am guessing these carbs were being used with pods.

Here's a pic of the upper clear vent lines on my Z1.

Good Luck!

Instead of using a filter on the crank case vent, I opted to run a crankcase vent tube down around the swingarm to underneath the bike.

Either system is okay, so long as the oem "S" shaped hose from the crankcase vent to underneath the airbox has been disconnected, which prevents any carb overflow into the airbox from draining down into the crankcase. But remember, fuel overflow can also reach the crankcase by going forward toward the engine.

In this photo, the smaller tube is a drain from bottom of the airbox.

Good Luck!

Duplicate post :S -- Please delete.

The floats are not able to work as there is a vacuum set up in the four float bowls due to the vents being connected. Just take that hose off that joins the vents. That is the problem.