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Jetting questions

spackinator

absolute newbie
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Smithfield, Ut, USA
Hey guys. I have a k4 sohc that I have been working on for most of the winter. This is my first road bike and incidentally my first four cylinder as well.

My question is what do I do with my jetting. It has drag pipes on it for now and a stock airbox and it seems like it doesn't like it much. I live at about 4600 ft I am running 110 mains. Are these right for my set up? What should I be running in it? I have no idea where to even go with it. Thanks guys.
 
Drag pipes are actually terrible for performance for stock motor. They take a lot more fuel to get it to run right because they are inefficient in scavenging. You will just have to try different jets and see what it wants. Check the plugs and see how its burning. Try a bigger main jet and go from there. Drag pipes may look cool but they are the worst exhaust for the 750.
 
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