Dave,
It may be due to a lean condition occuring at that RPM and load.
Take a spark plug wrench with you and when it occurs hold it there for a
minute or two then shut it off and pull over. Take a spark plug out and
check its condition, if its white you are running lean. If its black you
are running rich or misfiring. Another check is to raise the float
height if the RPM at which it occurs changes then your problem is in the
needle profile or possibly a vacuum leak. If there is no change in the
RPM at which it occurs then I would suspect ignition.
Just my thoughts.
Hope this helps.
Peter S.
>From: "Dave" <dgfox@uswest.net>
>To: "Spridgets" <spridgets@autox.team.net>
>Subject: Missing at high RPM only ... REPORT.
>Date: Mon, 1 Mar 1999 21:10:18 -0800
>Reply-To: "Dave" <dgfox@uswest.net>
>
>Sadly, the distributor cap screws were found to be tight. (so much for
the
>easy fix)
>I clipped off the old hole in each wire and made fresh connections just
to
>be sure.
>Still same problem. :-(
>I really don't know what to think at this point.(not that I did before)
>It's only within the range of 4800-5100 sustained rpm's that the
misfires
>occur.
>(Ulix thinks my tach reads a little high) above and below are smooth as
>silk.
>
>Any and All ideas would be greatly appreciated !
>
>Thanks
>Dave
>'67 midget that longs to run well at high rpm's
>
>
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