Chuck wrote:
: Hi, all,

Hi Chuck!

: All rpm indications were within spec (for static run-up, etc). When on
: the takeoff roll, rpm was about 2100, which seemed low, but there is
: no spec in the POH for rpm for the takeoff roll. The rpm went much
: higher after we were cruising (2300 or so).

: Also, there was a "burbling" sound from the exhaust.

There have been numerous cases of the 172R's fuel injection running
excessively rich, causing poor idle, loss of power, etc. Do ground
witnesses see a trail of black smoke from the exhaust at full power?

You might want to ask a mechanic familiar with the 172R fuel injection
about how it might be tested.

IIRC, the 172S, the 180 HP version, has a much lower incidence of this
issue.

--
Aaron Coolidge (N9376J)