--I may have just posted this whole thing twice - not quite sure....
I resurrected a '73 CB350F and am still tweaking the motor setup. I have a parts bike, which had the only thing close to a useable exhaust setup. (There's a picture of it below)
Originally, the bike had uni air filters, and it ran a little unsteadily, so I think I got smart and got my hands on a stock airbox, filter, etc., and put it back to stock, with stock jetting. Hell yeah! Works nicely, and that REALLY WEIRD looking muffler on the 4 into 1 seems to work pretty well. Once you get up into the 6 & 7000 RPM range, that little sucker goes nuts! (in the GOOD sense.) It feels like it was really born for the high revs...
I recently came across a somewhat beaten-up set of stock (4 into 4) pipes, and swapped them out to see what they would do. They sound pretty cool, but it seems to me that they really don't let the motor "go nuts" in the higher RPMs quite like the 4 into 1 does.
So I am wondering if I run the 4 into 1 setup again, since it seems that it runs noticeably faster than with the stock pipes, I probably should upjet by 1 size on the mains to a 37 (I think 35 is stock). Everything else is stock. I don't want to run the motor too lean, especially in the higher RPM range. I imagine that a plug chop would be the best way to really see if its necessary, right? I heard somewhere that discoloration of the headers indicates that the exhaust is running hotter than it should, also indicating that I might be running a little lean...
ALSO, I was thinking of getting a chrome muffler in a more "super-sport" style, and replacing the strange one on the end of the 4 into 1. It would have to fit a 2 1/2" OD pipe though, which seems pretty big to me. Any ideas on that, or where to find one?
Thanks for all the good tips so far, by the way! (Somebody posted their method of adjusting the tension on the cam chain with an allen-head screw, which works GREAT even when the other methods of "helping out the tensioner" failed!)
