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My 142 does not rev past 4000rpms 140-160

posted by  walrus3 on  Sat Mar 26 14:12 CST 2005
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last visit: Mon Dec 2 14:20 CST 2013
[RELATED]

First thing I would do is check the ignition timing. If you don't have
a timing light, loosen the distributor and turn it a bit, whichever way
makes it run faster. If it gets idling too fast, adjust the idle slower
and then go back to the timing. Where it idles the fastest (still being
set back to a reasonable idling speed with the idle adjust on the carbs)
will be pretty close. If it pings/pinks you can always back it off a bit,
likewise if it kicks back against the starter.

If that doesn't help, pull the valve cover and check the valve lift.
Should be over 3/8" on all valves.

If your manifold has secondary butterflies in it, make sure the carbs have
the arms to open them and that they are working. Otherwise carefully remove
the butterflies but leave the shafts in (unless you got a good way to plug
the holes).
--
George Downs Bartlesville, Heart of the USA!






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