The rear tire I mounted last week or so....developed slow leak.
Checked tire for nail/screws=nothing
Changed valve core 2 or 3 times to find one that sealed. Soapy water test, ok now
Then did more soapy water tests at base of special Honda Part number, H rated $11 valve stem----small bubbles around base, let air out of tire, rotated stem a little and wiggled, aired up tire again, checked for bubbles=ok BUT real fix is to remove wheel, break down tire, replace valve stem----Probably $80 job if you pay somebody.....because of mickey mouse involved with rear wheel removal.
Will work on this next week-----maybe can break bead with wheel on bike....and get inside to push new stem thru.
Current stem has been in use less than 6 months. I think older SilverWings may have or are going to have rear valve stem problems as the rubber parts age. i got rid of the original stem at about 40,000 miles and replaced with straight one....making checking pressure/filling tire from left side easier.
Leak developing early is probably just a fluke?