Hi folks,
I've got a 1979 KZ750B-4 that I purchased as a non running project, last September. I've just gotten to the point where I've been able to start the bike.
The previous owner had the stock 45 pilot jet, 125 main jet, and needle jet setting at the 3rd position, with a 2 into 1 exhaust. The spark plugs I removed from the bike from the last time he rode it looked really good, with a nice, milk chocolate brown color.
I've removed the 2 into 1 exhaust, and installed a MAC 2 into 2 setup with no crossover, and have kept stock jetting (45 pilot, 125 main, 3 clip position on the needle jet).
I am using the stock airbox with a clean and oiled K&N filter. There are no air/vacuum leaks.
Upon first start, (no riding, yet), it appears that the bike is running a bit lean. Air/fuel idle adjust screw doesn't do anything within a full turn in or out from the 1 1/2 turn setting as listed in the manual. I only see a difference if I turn it all the way in. That points me in the direction pilot jet is too small.
Also, the spark plugs are white after running.
I'm wondering if there is anyone riding the same bike with the same setup in the Albuquerque or Colorado area. We are a mile up and that will affect jetting. I'm looking for some recommendations as to jet sizes.
Thank you.
Current bike: 1979 KZ750B-4
Past bikes: 1976 KZ900A-4 (I sure do miss this one)/ 1975 Z1 900 motor in an AmEn Savior frame (I sure do miss this one, too!)/ KZ440 with belt drive (I don't remember the year)/KZ650 (I also don't remember the year for this one).