QuestionHi, I have a problem with the fuel petcock/gas tank. The problem is when I turn the fuel petcock to the on position, gas only comes out of 1 of the nozzles instead of it coming out of both. I took the tank and petcock off and cleaned both. The tank had some varnish in it, but I cleaned it out with a chain and shook it the best I could, and there isnt really any varnish left. I blew compressed air through the fuel petcock and the air came out of both nozzles, but gas will only come out of 1 of the nozzles...I dont know why. The motorcycle runs only on 1 of the cylinders, which is the one that has the gas coming out of it. If you could help, that would be great, thanks.
AnswerSean, this has been noticed in the past by other owners of Honda twins. There is an odd pressure balance issue going on internally and probably two things can help alleviate it.
I understand that you blew air through the petcock passages, but sometimes that is not sufficient for equal fuel flow through both of them. Remove the petcock, take off the outer plate, spring, lever and 4-hole gasket, plus the fuel bowl and screen. Find a small diameter drill bit that will fit into the holes in the side of the petcock where the 4-hole gasket sits and carefully insert and turn the drill bit BY HAND, a little at a time until you clear the passages out. You should be able to see the end of the drill bit come into the other ends of the passageways. Be sure that the reserve hole in the base of the petcock, next to the brass tube is clear, as well.
Another thing to try it to pinch off the tube that is flowing gas and remove the one that isn't from the carburetor. If the gas still doesn't come out, try a little compressed air back into that line.. gently! Too much air will probably blow the line off the fittings.
Lastly, check the gas cap vent hole next to the edge of the gasket for blockage. If the hole is plugged, it will create a vacuum inside the fuel tank, reducing fuel flow.
Bill Silver
