68ragtop
Well-Known Member
Trying to find the source of my hard starting 97 XP. Classic case of starting hard when its warmed up & sitting for 10 minutes. I have had the carbs apart twice & have gone through them thoroughly. They have all oem parts & while I haven't replaced any internal parts, they have passed tests.
What I have found to be a possible culprit is after the engine has been running & I shut it off, both carbs drip fuel from the high speed fuel transfer ports. I have tested the needle/seats. they will hold 10+ PSI with no leaks. no leaks in the fuel system, no pressure in the fuel tank. I also tried bumping up the popoff pressure with no change.
So, is it normal that some fuel can drip out of the port, or should it stop without one single drip the second the engine stops pulling vacuum. Somehow fuel is transferring out of the fuel chamber & into the engine. maybe a small amount is normal & this is not the cause of this skis hard starts, but I am looking at everything very closely right now.
I would think the if the needle & seat do not leak, then the fuel chamber should be sealed & nothing would drip.
If it can drip, it would have to have a leak somewhere? I was thinking maybe the regulator diaphragms, but neither of them drip fuel out of the atmosphere vent holes.
If nothing else, I can pull apart my GSX & see if it drips anything at all. That machine restarts perfectly when its hot.
EDIT: sorry,, I posted this in the wrong section. Trying to figure out how to delete it.... Oooops
What I have found to be a possible culprit is after the engine has been running & I shut it off, both carbs drip fuel from the high speed fuel transfer ports. I have tested the needle/seats. they will hold 10+ PSI with no leaks. no leaks in the fuel system, no pressure in the fuel tank. I also tried bumping up the popoff pressure with no change.
So, is it normal that some fuel can drip out of the port, or should it stop without one single drip the second the engine stops pulling vacuum. Somehow fuel is transferring out of the fuel chamber & into the engine. maybe a small amount is normal & this is not the cause of this skis hard starts, but I am looking at everything very closely right now.
I would think the if the needle & seat do not leak, then the fuel chamber should be sealed & nothing would drip.
If it can drip, it would have to have a leak somewhere? I was thinking maybe the regulator diaphragms, but neither of them drip fuel out of the atmosphere vent holes.
If nothing else, I can pull apart my GSX & see if it drips anything at all. That machine restarts perfectly when its hot.
EDIT: sorry,, I posted this in the wrong section. Trying to figure out how to delete it.... Oooops
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