To start with, it should not be too difficult to fix yourself..

Secondly, many times have we thought the compression "seems ok" when in fact it was not. My advice there is that if there is any doubt, check them both with a guage to be sure they are within correct measurements.

When you seem to loose power, does it still seem like you are running on both cylinders?

Problems like this are usually, like you had said, fuel or fire.

Let me ask, when was the last time the carbs have been cleaned? If has been a while, that would be the first thing that I did, along with the rest of the tune up procedure - i.e. timing, points, cam chain tensioner,etc. All fairly easy, but essential in the troubleshooting procedure. When cleaning the carbs, be sure that the needles to not have grooves in them (where they go into the jet), and that the floats are in good condition and they are the right height.

Once you get all of that done (to be quite honest, even with minimal mechanical ability should take only a couple of hours), you should have better response. If not, then it is time to start looking at other things, like coil, etc.

How do the spark plugs look? Are they gapped correctly?

Do you have a manual? If not, GET one these things are worth 10 times their weight in gold.

Mike