Hi everyone,
I'm hoping that someone with more knowledge than I have could help me with a problem that I'm having. My bike is an 81 kz750 ltd 4 cyl with Keihin cv34 carbs. I bought the bike a few months back and have slowly been restoring it to get it running again, the previous owner had it sitting in a garage for about 10 years or so not running. I finally got the bike running, but my issue is that whenever the bike is started, it goes straight to redlining (although I'm not exactly sure what the RPMs are as he also ripped out the tach, although its way too high without a doubt, as in gas is starting to pour out of the exhaust pipe heads), and I can't figure out why.
A few other details: I have pods on the bike currently (I've jetted to 70/125), I've cleaned out the carbs multiple times now with no help, and, recently today, I tried removing vacuum lines 1 and 4 on the carbs and capped them, and then ran another piece of tubing between the vacuum fittings (I think these are vacuum fittings?) further up the engine near the valve cover. This seemed to have no effect on the problem, as the issue continued whether or not the vacuum lines were on 1 and 4 or not. I still cannot seem to figure out the problem.
One thing I suspect that MIGHT be the problem (which is where if someone could chime in who knows more about these bikes would be awesome) is that the previous owner had broken off part of the choke return spring that's between carbs 2 and 3, and re-wrapped the spring around the spring housing again in order to get some tension behind the spring. As far as I can tell, this isn't a problem as the choke seems to function properly, although I did take a look at the valves that are opened and closed with the choke, and noticed that they seem to move slightly in and out (they're not all the way closed with the bike running), although I assume that this is normal behavior? If this isn't someone please let me know. If I go to close the valves or slow them down (by pressing in on the lever that returns all 4 choke valves) as the bike is running, it stalls out pretty easily. I think that I have put this assembly back correctly as well--I'll include a picture in hopes that that helps.I have seen an instructional forum that someone made about turning that choke lever into a more mechanical lever, and was thinking that that might not be a bad idea to try.
If anyone has any suggestions please let me know, and thank you!!