On 15-Aug-2003, Tim Bengtson wrote:

I have had the same symptoms for two different problems. One, as has
been suggested, was a blocked muffer. Bang the thing around a little
bit and see if anything rattles in there.


Some other possibilities that are easy to check it static RPM is low:

1. Verify that the throttle linkage allows the throttle to be fully opened
with the control full forward.

2. Verify that the carb heat shuts off completely.

3. Check to see if leaning the mixture increases static RPM. Of course, it
will if the test is done at a relatively high density altitude, but if RPMs
increase with leaning at or near sea level the full rich setting is probably
too rich, or else there is an obstruction in the induction air system (e.g.
a clogged air filter).

Let us know what you find out.

-Elliott Drucker