I'm a newbee to the forum. Just bought this bike in June and have brought it back to life. I'm a fan of the old 4 cyl. Used to have a KZ650 years ago but had to sell it for safety reasons. Worked long hours and had a hard time staying awake while driving let alone riding. I've been reading several posts out there in regards to leaking carbs. I have a 1980 KZ 550C LTD been sitting for several years. Prior to having any work done the carbs did not leak fuel thru the drain tubes nor into the engine. Work that has been done. Valves adjusted, carbs rebuilt w/ stage 4 jets (exhaust modified & air box delete), plugs, fuel tank cleaned, rebuilt petcock,, fork seals and several other minor items. Problem I'm having is after having the carbs rebuilt by a certified tech after about 300 miles the #1 carb started dumping fuel out the bottom hose. The bike would run for about 3 minutes then dump the fuel for about 15 seconds. Never missing a beat. The bike runs awesome. I've read that the float level could be wrong. Took back to the tech he's checked and double checked the settings. While off the bike with a temp gas supply on the carb would leak fuel. If the gas is off then it wouldn't leak. Somewhere I read the overflow tube in the bowl could leak. If that is so wouldn't it leak as long as there is fuel in the bowl? Doesn't that tube go down to the drain screw? If the drain screw is closed how can fuel get by? Could it be as simple as the o-ring for the drain? One other note the tech said that #1 stopped leaking but 2 & 4 started. I looked inside the bowl at the overflow tubes and on #4 it appears at the bottom there is a slight crack but not on the others. We poured fuel in the bowl and it just dripped not dumped fuel. Again could this be an oring nit seating properly? Any ideas would be greatly appreciated.
