Jim,
Before you pull the head, superglue a small bit of mirror onto a bendable
bit of wire and peek into the sparkplug holes with a deft touch and a
flashlight. Then remove the manifolds and stare into the ports and check
for the smooth raising and lowering of the valves turning the engine over by
hand. I doubt the disc could be hiding somewhere that you wouldn't see it
this way. When the manifold is off, a light shown through the port with an
open valve will illuminate the interior of a cylinder for a plug hole
inspection. You can easily see most of the piston tops and look for nasty
marks, gouges and so forth.
Good luck,
Glen
> Per David Anton's (APT) suggestion ( & per Vizard's book) I had cut off
> the overrun valve on the throttle disc & soldered (obviously not well
> enough) the remaining valve disc (bronze, about 3/8" dia) to plug the
> hole in the throttle disc. THE VALVE DISC IS MISSING after running
> engine for first time yesterday.
>
> The engine only ran for a few seconds several times; it idled extremely
> fast then would stop if let up on choke or throttle. Eliminated all
> causes except the carb - a single HIF6 SU. After removing the SU today
> to tune it, I saw that the plug had come off the throttle disc. I do not
> know if it was sucked into engine, or if it fell out when I moved the SU
> to the work bench. I've checked the floor, but it could have rolled
> anywhere. I pulled the intake manifold & looked & felt in the head. Not
> there.
>
> Could something this size, flat 3/8" dia, go past an intake valve into a
> combustion chamber? If I cannot find the disc I plan on pulling the head
> to check chambers. Is there anywhere else I should check before or while
> I have head off? Engine was professionally built & I assume I will void
> warrantee if I pull head, but I do not see any other solution. Help!
>
> Thanks in Advance.
>
> Jim Rogers
> San Juan Capistrano, CA
> 59 Bugeye
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