newprotest.org: BACKFIRE

BACKFIRE

June 23, 2007
by: jovial_cynic
The engine is running, but it's constantly throwing flame out of carbs. I glanced through the wikipedia article on backfire, and this seems to explain it for me:

When starting an engine, timing that is too advanced will fire the spark plug before the intake valve is closed. The flame front will travel back in to the intake manifold, igniting all of that air and fuel as well. The resulting explosion then travels out of the carburetor and air cleaner.

Alternatively, it could also be an issue of running too lean:

Usually, backfiring occurs in carbureted engines that are running lean where the air fuel mixture has insufficient fuel. ("Running lean" is typically a sign of mal-adjusted carburetors or fuel injection where there is not enough fuel for the amount of air).
np category: 510
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