It simply isn't possible the but *just* varnish from fuel or loads of us would
suffer from it, but it could be a combination of that with other factors like
insufficient clearance which is down to him. You could try running the engine
with the rocker cover off and clipping an adjustable timing light to various
plug leads and pointing it at the suspect valve or valves, on the appropriate
lead by turning the adjuster on the light you should be able to freeze the
valve in any position from fully up to fully down and watch for any
erraticality.
A high idle shows fuel is getting past the butterfly. Whilst worn bushings
and shafts *can* cause this, I doubt they could be so bad as to make it idle
at 2500rpm. I've had a similar effect from the poppet valves in the
butterflies, although that was during warm-up from below freezing. I soldered
them shut. Other than that something must be causing one or other of the
butterflies to stick, try pressing each closed in turn and if that does
something does it have the return springs on each butterfly (to the heat
shield as well as around the spindle)? Is there some free play in the
throttle cable? Failing that it could be the butterfly binding in the throat.
Removing the air cleaners and using a listening tube or balancer should tell
you which carb is sticking open or whether both are.
PaulH.
----- Original Message -----
... He said it was more likely that " varnish" in my
gas was causing the valves to stick.
...I should add that I am also getting erratic
idling. It will gradually climb to 1200 to 1500 rpm after driving for
20 minutes or so and sometimes goes to 2000 to 2500!
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