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Originally Posted by Easy Rider
Hmmmm......uuuuuu.... I don't think so. :whistle:
GZ's (and modern bikes in general) tend to run LEAN, not rich.
A lean condition gives a POP, usually on deceleration. A real after-fire is a loud BANG, along with fire from the pipe; that is caused by a really rich mixture.
Valve clearance is measured in THOUSANDTHS of an inch and is seldom out of adjustment more than .001-.005 inch. You can sometimes HEAR a difference but the affect on performance is TINY, if any at all. Impossible, no, but highly unlikely.
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I think I have heard the POP, on my Strat. Tends to backfire a bit if you make poor shifting decisions. The sound I got in the rain yesterday was more BANG like, firecracker bang like, and it did sound like it was coming from the tail pipe. I didn't notice any fire as I was focused on getting out of traffic, on account of being stalled and the light being green and everything. Only happened the once. I think I smelled some gas too. The cranking was characteristic of what we called "flooded" when we couldn't start a lawn mower.