Quote:
Originally Posted by IF13
...........But can that explain the pop right at the moment the button's pushed to start the bike?
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Even at the low speeds of cranking up and idle, there are more than 20 explosions per second.
It only takes one of those happening late to produce a loud boom.
I have seen mufflers completely opened by the instantaneous increment in pressure generated by one of those (that is why cylinder's walls and piston's heads must be thick and strong).
I don't believe that any exhaust or intake pop is normal for pre or new gens; they are symptoms of something out of whack and I wouldn't just ignore it.
If the mix is too lean or too rich at start ups, or if the sparks are too weak, then they cannot be optimal at normal operation and high rpms'.
Learn more here:
http://en.wikipedia.org/wiki/Back-fire
