A wide band oxygen sensor for each carburetor and a data logger.

I will take a wild guess that it is one carburettor per cylinder with IR manifolds.

Slightly cheaper option is one or two oxygen sensors and an exhaust gas temperature sensor on each pipe with a data logger. Move the oxygen sensor around for comparison tests to get a base line for the EGTs.

Of course I have been jetting carbs "by ear" for performance for some 50 odd years now and I can tell you that, even with all that experience, I would still recommend the dyno to set up the carbs on a bike...Trust me, it will be cheaper and faster to get it right the first time and avoid the risk of internal engine damage.  Dyno time for bikes may take a little looking but,  Time to jet a bike is minimal and dyno time is usually negotiable, depending on your bike and personality. I have seen "jetting check" adds for $35/hr. in some mags (I just had a portable dyno set up at my shop and did a break in and jet/power check on a new engine for my Mini at a cost of $125/hr./check valve).

If you still insist on doing it like I did it in the 50's, try the local magazine/book store.  There is enough on this subject to keep you busy for months! Reading plugs correctly is an easy thing to learn but requires LOTS of experience to be 'spot on'.

The dyno should have at least a wideband O2 sensor to sniff exhaust gas during the run.  The carbs should be synced prior to showing up at the dyno.  It should also have a good and properly operating ignition system. If you can be fairly certain your cylinders are all breathing and firing in a similar fashion dyno time will be reduced.  If you are showing up at a dyno tuner to fix your bike rather than tune it you will need more than a single O2 and spend a lot more cash in the process.

Many think of dyno time as expensive yet they spend $500 on a pipe, $150 on a jet kit or $300 on a power commander and throw Shite loads of cash into polishing aluminum and painting body work.  Then they say, $250 dollars to correctly set up a power commander or jet kit is too expensive.

Dyno time is cheap compared to what one spends on hot roddding and personal time testing on the street.

Additional note...your peak power will be found at 12.5 to 13.8 to 1.  Not lean at all.  Lean is mean is an old term and will lead to disaster.  If you tune for peak power you will not be lean at all.

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