Originally Posted by
MattTLS
Using a wide range lambda meter and a data logger is probably the best way to tune in real-world conditions. The simplest accurate setup to tune a fuel injected system would have to record the speed, rpm, throttle-position, and air/fuel ratio. Obviously, if no further changes are made to the setup of the engine, this would only have to be done once on a fuel injected engine, but the same isn't true on a carburated engine.
And that bung welded in the exhaust is where the lambda sensor would be hooked up.
It's not cheap, but the professional wide range lambda meter from Motec is $1000, and the four-channel data logger from Czech-Mate Tach-Mate is about $450.
If you want some info on this stuff, I know someone in Wyoming with this equipment. He will also travel anywhere to do the tuning himself so long as there are at least five bikes to tune at a cost of $300 each.
Matthew