kzwolfsr wrote:
...i just plugged those hoses onto these sticking out parts on the carbs, so i just have to get reliable caps for them.
I had a VERY similair problem with my 78 KZ650. On the carb rail are three rubber hose ports. One, which is on the carb for cylinder #3 (I think it's #3) is for the gas petcock. The other two 'vent' the carbs. I had capped these off and had the problem you describe. Not knowing, I tried connecting a hose between the two (which still does not VENT the carbs) and I had the same problem. Trip to the local Kawasaki shop to talk to a knowledgable mechanic. Those two ports are supposed to have a hose hooked to them that is routed up under the tank and then left open. They allow air to vent into the carb chambers. Without them, a slight vacuum will develop that will suck gas through the main jet.
Another thing, With the carb vent ports capped off, when I took off a vacuum cap on one of the intake manifolds to attach a vacuum gauge, a little bit of gas would drip out. After I let them vent, that stopped.
That's my experience. Drove me crazy trying to figure it out. I think I must have disassemblied and cleaned the carbs and rail three times.
Once I corrected this problem, my engine behaved. And, having spotlessly cleaned carbs runs really nicely. Until my coils crashed.... It's always something!
Good Luck.