If the petcock fails raw fuel gets dumped down the vacuum line and into the engine though the #2 cylinder. This excess fuel can gum up the piston rings causing them to loose their seal to the cylinder.
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If the petcock fails raw fuel gets dumped down the vacuum line and into the engine though the #2 cylinder. This excess fuel can gum up the piston rings causing them to loose their seal to the cylinder.
What Ed says, and if the engine is run a lot of miles with the failed petcock diaphragm, the excess fuel can prevent the oil from protecting the cylinder and rings, and the piston itself, they can wear. In this case the compression may take a lot of miles to come back up, or maybe if the wear is bad enough, it won't come up at all. But it can't hurt to try. Riding is good.
A
Assaf
Guest
OK, thanks.
This could indeed have happened b/c the petcock was faulty when I bought the bike. Fuel leaked into the carbs (and out of them) when the engine was off. I immediately replaced the petcock and fuel valves, but who knows how many miles it had been run like that.
This could indeed have happened b/c the petcock was faulty when I bought the bike. Fuel leaked into the carbs (and out of them) when the engine was off. I immediately replaced the petcock and fuel valves, but who knows how many miles it had been run like that.