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petcock vacume check valve 82 gs850glz

  • Thread starter Thread starter Anonymous
  • Start date Start date
A

Anonymous

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in the fuel petcock, in the vacume diaphram area, there is a small disc with 4 holes in it that vacume draws thru . on the other side of this disc there is a rubber flap acting as a check valve only allowing airflow (vacume) to flow in one direction. i melted the rubber disc with carb cleaner and it is gone now. after cleaning rubber out of that area i tested the petcock fuel flow and it works as usual. i created vacume by sucking on the hose. my bike is apart so i havn't run it yet. my question: when the engine backfires or if it sends a burst of air backwards through the vacume line into the diaphram, being that that burst is now unrestricted without the rubber check valve, am i going to have problems? thanks for help
 
It sounds like you will have problems. with a bad diaphram the engine will suck fuel excess fuel into the #2 cylinder and you have no way for the fuel to be turned off.
ONE of the basics of repair is to HAVE A PROPERLY WORKING FUEL VALVE it will effect other aspects of the bike and can make it dificult to get the bike to run properly
 
petcock diaphram

petcock diaphram

my diaphram is fine, and the petcock works fine. the problem is with the rubber check-valve that is attached to the small disc with the 4 holes in it (to the right of the diaphram itself, housed in the right cover). . without the rubber check valve, which will now allow reverse pressure(if there will be any??) to push the diaphram in the opposite direction(the direction of the spring pressure), i want to know if that opposite direction pressure(which may come from backfiring,etc..), hitting the diaphram will hurt it. a backfire(which these bikes do) will be a strong blast going directly to the diaphram(i believe) now that the rubber check-valve is missing. to best understand this dilemma, the disc & rubber check-valve(not the diaphram itself) must be understood.thanks
 
Re: petcock diaphram

Re: petcock diaphram

fr555 said:
my diaphram is fine, and the petcock works fine. the problem is with the rubber check-valve that is attached to the small disc with the 4 holes in it (to the right of the diaphram itself, housed in the right cover). . without the rubber check valve, which will now allow reverse pressure(if there will be any??) to push the diaphram in the opposite direction(the direction of the spring pressure), i want to know if that opposite direction pressure(which may come from backfiring,etc..), hitting the diaphram will hurt it. a backfire(which these bikes do) will be a strong blast going directly to the diaphram(i believe) now that the rubber check-valve is missing. to best understand this dilemma, the disc & rubber check-valve(not the diaphram itself) must be understood.thanks
Click to expand...

I sent you a PM before I read this last post, but now I'm confused. :?
 
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