Me too, and I think everyone else who has tried 42 PSI vs. lower tire pressures.
This usually stirs some kind of strange, Internet argument about the tire carcass having some stiffness but anyway.... tire pressure controls the tire contact area and it also controls, to a large degree (no pun intended) the friction of the tire and how it heats up. The C-14 is a big, heavy bike and by increasing the tire pressure above what is wanted or desired in much lighter sport bikes that use the same tire size, it reduces the contact patch area but also helps keep the tire cooler. For better or worse, a C-14 simply will not keep up with, say, a liter- bike using the same size tires. Sport bike tires and lower pressures work fine on a C-14 but not for long and it wipes out the tires and in the end, will not allow it to behave as a sport bike anyway.
Bringing the tires up to, let us call it 'normal pressure' for this bike, seems to work best overall. There is some 'grippiness' to be had by lowering the tire pressure but it is at the cost of fuel economy, overall handling feel, at least IMO, and certainly tire life. Some people have tried bona fide sport bike rubber on the C-14 with posted results of excellent handling for very few miles and extremely poor tire life.
42 PSI has worked best for me on my C-14. That is cold, and may register up to 44 PSI on the TPS display, after the tire is up to temp. (and the TPS sensors are temp. compensated- go figure).
Brian
Edited to use correct words. Long ago, people were taught to read, write and spell. Then came computers and lots of us (I am pointman on this!) gave up entirely on spelling and just use a spell check to correct spelling. The result is that instead of miss- spelling words, we have the machine simply use the wrong words in place of our perhaps correct but misspelled words.
To me, it seems that a lower pressure would create more friction. For me, I run mine at 43 psi