Good testers
There are of course good quality compression testers and bad quality compression testers, and unless you go pro-level, yours is probably one of the bad ones. Two things stand out in telling the difference. One, if the tester does not include separate, dedicated hoses for each size spark plug hole, you got a bad'n. Testers with screw-on threaded adapters are the bottom of the barrel, the bane of the industry. They're toys. Be reconciled to the fact that more often than not they will read low. The same with those tapered rubber tip jobs. Pedestrian, both. Two, another giveaway of a bad conpression tester is if it has a cheap-looking pressure gauge, especially if it's plastic. Professionals aren't drawn toward immitation tools such as these. You shouldn't be either. Expect to spend at least $200 on a compression tester, not $49. Note that I have said nothing about the tool's hose diameter or length. The subject is steeped in myth and lore. It's a non-issue, ridiculous, juvenile.

Altitude
Honda's compression numbers are relative to sea level. There are charts all over the Internet that will help you determine corrected compression for when your test is conducted at altitudes offering less oxygen. Where I live, elevation 5300 feet, the correction factor (i.e. the expected loss) is 15 percent. You simply must take this into account when testing cylinder compression. And this is not an Internet fallacy. It is real.

Throttle and battery
Most folks know you must hold the throttle wide open while testing cylinder compression. If the carburetors have been removed, that is the same thing. But the battery must have a good charge also. I have found that I have had occasionally to recharge the battery in the middle of testing compression on all the cylinders on a six-cylinder CBX. Of course, we're assuming electric starting. Something else: Forget warming up the engine first. Although promoted by Honda in many of their manuals, it is neither necessary nor beneficial. Every Honda engine I have ever tested, and that has to run into the thousands, has delivered accurate numbers stone cold.

Attitude
Above I said, "altitude". Now I'll add, "attitude". What I mean is the attitude forums advocate of always blaming the other party. "My compression is low, Honda's numbers must be wrong!". It doesn't take very much time spent on forums before you will be affected by this irresponsible ethic. It is shameful and idiotic. It's also patently bad mechanical practice. "Bike's not running right, better rejet the carburetors. Charging system seems weak, gotta modify it. Headlight could be brighter, time to alter the wiring with a relay. Starting and storage are problematic, must be the ethanol". Stop! It is illogical to conclude that modification is a form of maintenance. Yet, this nonsense practically defines user forums. No one thinks any more. The problem with society isn't parenting, politics or pedagogy. It's that we have been trained to no longer think. Rant over.