Hello, KZR! Last year I purchased a 81 KZ 750LTD for $300 as a project bike. She had 9600 miles (9900 now). Long story short, she had sat for a handful of years and needed some tlc. This is what I did... removed, cleaned and rebuilt all 4 (keihin) carbs, new boots, new petcock, spark plugs, plug wires, battery, rebuilt calipers, oil + filter, etc. And she is running good, but. Here is the issue, and this has been a consistent problem with the previous owner as well. She has a rough cold start. Has 4 carbs, the 2nd one from the left side is iffy, it has problems firing when cold and smokes from the left hand side exhaust pipe (4 carbs, 2 in 1 exhaust so 2 pipes). Originally the 2nd or inside carb from the left hand side would not fire, I could tell by touching the pipe before it merged with the #1 carb's exhaust. When I got her ready this spring she started and ran but at a cold start or even after sitting for a couple hours and cooling down the trouble carb (second in from the left) will not fire until i rev it up a couple times and hold it around 3 or 4 on the tach for 5 seconds or so. Then when you let off the throttle it will hold for 2 or 3 more seconds and rev back down. But after this cycle she idles and runs great all day and I have been using it as a daily driver. Any idea what could be causing this rough cold start?
