<VV> Re: bad running spyder

[djtcz at comcast.net]

> 
> Now: First thing, I grabbed up a can of carb cleaner and blew it through 
> the idle mixture screw hole, smooth idle returned. We messed with it a 
> minute or two, seemed like it was OK. Still no effect at all when the 
> idle mixture screw was turned.... Atwood left for home, car ran well until 
> he got within a block of his house and it did it again, had to limp it to 
> the driveway whereupon it quit immediately just like before. I kinda 
> figured that sooner or later the carb was gonna have to come apart 
> again. I suppose it's gonna be sooner. 
> 
> Anybody seen a problem like this in a YH? We popped the top off the carb (which remained on the 
> engine) and inside it was clean as a whistle, blew through the idle mixture 
> passages and air bleeds etc, watched the main jet bubble and spurt etc, all 
> seemed normal. Still no idle circuit operation at all. It's time to 
> dismantle the carb *again*, probably tomorrow. 
> 
> 
> tony.. 
> 
As a precaution I'd check for a fat blue spark and maybe even new plugs. I'd check fuel pressure and volume, and catch a sample of the fuel delivered in a clear glass container with smooth thin walls for good visibility, like a beaker.  I'd add a little isopropyl dry gas to the sample and swirl it around.  If it suddenly goes notieably clearer there is water in the fuel.  There are a few ways to deal with that.

Even if the fuel stays clear I'd add Valvoline Synthetic fuel cleaner at max concentration to 5 or more gallons of fresh new fuel in a clean gas can.  I might use an auxilliary pump to get most of the gas out of the tank, then add the 5 gallons of fresh gas.  I'd probably crank the engine a bit with the fuel line disconnected to clear the line of old gas.