Quote:
Originally Posted by gtrmaster88
... neither one are very much experienced on carb work,
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After all the talk (e.g. about the
14.7:1 air/fuel stoichiometric relationship), your best source to
KNOW (not just guess) what's going on in that combustion chamber is looking at the spark plug center electrode UNDER LOAD.
Pull the spark plug; the center electrode should be a very light tan color. Darker colors, including black, indicate a rich air:fuel ratio; a white center electrode indicates a lean mixture.
If the engine is allowed to drop to idle speed, that center electrode can/will change color. To see what going on (i.e. what the air:fuel ratio is)
UNDER LOAD, kill the engine
at speed with
OUT rolling off the throttle (remember: the center electrode color you see will reflect
the air:fuel ratio when the ignition was killed; you don't want that to be the air:fuel mixture at idle), de-clutch, stop the bike and pull the plug for a look.
Less oxygen at higher altitudes means less fuel is required to obtain that ideal 14.7:1 air:fuel ratio.
Enjoy ... jetting carburetors is a fun (and rewarding) undertaking ... made even more fun when accompanied by PATIENCE (and perseverance).
