Got a quick question for anyone who would have an idea about this!
I have a 2003 z-400 and it runs great doesn't burn any oil doesn't miss runs good! But ever since i bought it about 4 months ago it has popped and back fired any time you let off the gas. I thought it might have been the rusted through muffler on it so I bought a DG racing pipe from a guy off Craigslist that looks like its brand new and it seems to do it even worse now. I am running a 160 main jet cause it be popping and back firing because its running to lean or rich? Every where I've read they say I should be running a 175 but I havent had to time mess with it yet.
Doesn't have an exhaust leak anywhere? Any thoughts or ideas of how to fix it cause its about to drive me nuts!