>The carb can probably benefit from a good cleaning anyway
There is no question of this, as past operation brought rust flakes and other
filth up into the carb. I don't think any further junk can get to the carb,
as I've added a high-quality inline filter.
> The mixture screw only affects idle mixture, not the mixture
> through the power circuit.
I didn't know that, altho the problem is most noticeable at idle.
> consider the relatively close clearance between a step-up
> piston and cylinder. If the piston gets stuck in a position
> where it is holding the metering rod up, it will allow an
> overly rich mixture under anything but the heaviest load
That sounds like a possibility...
> A leaking or stuck-open float valve can certainly cause an
> overly rich mixture as the bowl fills with fuel and overflows
> through the venting circuit into the throat. On some carbs,
> the higher fuel level may also prevent the air emulsion tube
> from introducing air when it needs to do so.
When I had the top off the carburetor earlier, I had some suspicions about
the free motion of the float valve.
6) A loose jet can create an overly rich mixture.
Does it screw into place, and can work loose with vibration?
>I assume you've checked this, but is your choke opening all
>the way?
Yes -- that's one thing I can be confident about. Choke action is normal.
> Ordering an overhaul kit is a good idea.
> It would help if you have the manual for the carb.
Anyone know where to find the manual on the Carter YS?
> Some tips: Cleanliness is imperative at all stages
> of an overhaul. Don't take apart throttle or choke plate
> assemblies unless you know your stuff.
I won't, as I don't really fall into that latter category. When I think about
the complexities of carburetors I find myself dreaming about designing a way
to do this electronically -- guess what technology I'm more comfortable with!
Thanks for all the good info, Alan.
Steve Johnston
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