matthend Posted June 16, 2008 Share Posted June 16, 2008 This problem has now reared its head 4 or 5 times since I replaced my petcock diaphragm (about a month) If I am on the closed private road/freeway and roll into the throttle to anywhere in the triple digits, it will run fine for about 30-60 seconds, then start sputtering and losing power until it eventually dies. I have found that it I give it full choke and start it back up, it will run rough for a minute or two and die if I try to twist the throttle.When the revs rise to 3-4 k I can give it some gas and it will cough its way through the rev range for a few twists, then eventually run fine again. This has never happened on the surface roads as of yet, and has me baffled. I just filled it and dumped a can of seafoam in the tank, anyone have any ideas as to what could be the culprit? Thanks in advance! Quote Link to comment Share on other sites More sharing options...
CxBXR Posted June 16, 2008 Share Posted June 16, 2008 Gas tank vent line pinched ? Was it doing this prior to replacing petcock diaphram ? Quote Link to comment Share on other sites More sharing options...
matthend Posted June 16, 2008 Author Share Posted June 16, 2008 no, it would lose power and die completely previously, the petcock was not allowing any fuel through at all. I cut a hole in the diaphragm and it was feeding fuel via gravity while I waited for the diaphragm to come in at the dealer and running fine. I will check the vent line though, I could have set the gas tank on it or something. Quote Link to comment Share on other sites More sharing options...
matthend Posted June 17, 2008 Author Share Posted June 17, 2008 pulled the tank and all lines looked fine... anyone have any other direction at all here? :icon_wall: Quote Link to comment Share on other sites More sharing options...
CxBXR Posted June 17, 2008 Share Posted June 17, 2008 It is def. fuel related, check the carb's they may need cleaning ? Sounds like you are starving the engine dead. Quote Link to comment Share on other sites More sharing options...
matthend Posted June 17, 2008 Author Share Posted June 17, 2008 so the nothing nipple does not need a line on it? I assumed that was some sort of overflow also. Quote Link to comment Share on other sites More sharing options...
CxBXR Posted June 17, 2008 Share Posted June 17, 2008 so the nothing nipple does not need a line on it? I assumed that was some sort of overflow also. nothing goes there Quote Link to comment Share on other sites More sharing options...
MrBadExxample Posted June 17, 2008 Share Posted June 17, 2008 You're positive the rubber diaphragm is installed properly? It would be easy for the lip of the diaphragm to slip out of position during installation. Quote Link to comment Share on other sites More sharing options...
jon haney Posted June 18, 2008 Share Posted June 18, 2008 You're positive the rubber diaphragm is installed properly? It would be easy for the lip of the diaphragm to slip out of position during installation. +1 You're getting fuel, just not enough. There should be a screen/filter where the fuel flows into the petcock. Check that to make sure it is clean. You might have to remove the petcock assembly to check this. Good luck. Quote Link to comment Share on other sites More sharing options...
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