In rec.aviation.owning Bob Fry wrote:
: Three years ago when I checked the tachometer, it read a little
: slow--maybe 10-20 rpm at speed, that is it would indicate 2300 and the
: electronically measured rpm would be 2310 or so. Assuming that's
: still true, what would cause the engine to not make minimum rpm?
: Where should I start troubleshooting?

In rough order of liklihood
- Tach
- Mixture (Here at 2100 MSL, often too high DA to get full RPM in the summer)
- Timing
- Air filter
- Muffler blockage
- Compression
- Ignition (plugs)
- Ignition (others... unlikely: mag internal timing (egap), wires)

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* Cory Papenfuss *
* Electrical Engineering candidate Ph.D. graduate student *
* Virginia Polytechnic Institute and State University *
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