Let me answer these in order:
Pistons drop with the classic "click" when they hit bottom.
Original mechanical fuel pump in use.
No restrictions in fuel lines.
Just had the float assemblies apart to check this and floats are fine.
New needle valves and seats.
Bad Karma might be the joker in this deck.
Mike MacLean-60 Sprite
P.S. Balance pipe?
ckotting@core.com wrote:
> Hmmmm. You've probably checked these out already, but:
>
> Piston hanging up in chamber (not dropping all the way)?
> Too high a fuel pump pressure?
> Fuel line betwen the carbs blocked/restricted?
> Bad float?
> Bad float needle valve?
> Bad karma? (I'm runnin' outta ideas here...)
>
> One last thing, don't forget that the two carbs are connected for
> airflow (through the balance pipe), and fuel delivery. You could be
> tweaking the heck out of the back carb to compensate for a problem
> that actually is in the front carb. (BTDT)
>
> Chris K.
>
> > I think I've got the tuning of the multiple S.U. carbs down pretty
> well
> > after rebuilding the jet assemblies twice, replacing the rear carb
> body,
> > shaft and butterfly and replacing all other gaskets in the carbs.
> It
> > amounts to rebuilding these carbs twice. I am stumped by the rear
> > carb. The mixture nut has to be screwed almost all the way up to
> get it
> > to lean out properly and idle will drop below 1500 rpm with the
> > adjustment screws all the way off the stops of both carbs. The
> needles
> > are correct for the S.U. H1 carbs (GG) and the jets are the correct
> .090
> > size and are new. What are some possible reasons for this?
> > Mike MacLean-60 Sprite
|