i have an "05" sporty 1200 custom. it had the vac assist on the fuel valve, i replaced it with an aftermarket valve when the diaphram went bad and havnt had any problems since, till today. i started to take off after getting fuel and all of a sudden it sputtered and died, it kept this up for about nine miles till i finally got it home.  i checked plug wires, fuel lines, vac lines, fuel valve, everything seemed ok so i let it sit there while i thought about it, a couple hours later i fired it right up, took off on it and had no problem, anybody have any ideas what would cause this

 

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possibly something flaked loose and partially plugged the fuel line? Or perhaps the petcock was "between" settings?

YUP. Denny hit on it, the only explanation I could  figure. I use the following rule as well....if ya see the fuel truck dumping into a gas station, do NOT fill up there, unless you're desperate ! Because that influx of liquids into the big tanks will churn up settiments there and then you buy them !!!



Denny Fosburg said:
possibly something flaked loose and partially plugged the fuel line? Or perhaps the petcock was "between" settings?
yes,most likely some debrie got caught in the petcock or needle,change the fuelfilter & make sure to use ethenol  treatment cause the fuel will eat the seals in the petcock & needle.

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