Maybe the "CT: Pirelli Snowsport 210 ROF 195/55/16" has something to do with it.
Honda is aware of "unusually high loads" on the drive line caused by the use of car tires. They suggest sidewall inflexibility due to contact patch of car tires load the rear arm to an extent that could cause damage to the drive line components.
I bet your eyes are brown too?
Unless you Work in Honda.Then I say you're full of something.

4:
A tires traction has no bearing on the quality of the parts up the drive line.Unless the OP was doing constant burnouts??
Is this the same mother Honda that looks for any excuse to not cover problems under warranty?:shrug::shrug::shrug: Just asking.:lol::lol::lol:
I beg to differ here!
I have had ten-yes ten warranty repairs without as much as a whimper from honda when my bike was in warranty.
The major things were the 3 engine pulls.
1-ACG replaced.
2-two tranny rebuilds.
The last they installed a Complete new engine.
All on the same bike.A little over $17,000 on Honda's dime..not bad for a ex-warranty huh.
So much for your statement huh..LOL
Nope! The noise and backlash was evident long before the CT was installed.Thanks anyway.
You would feel a very slight backlash if you were in high RPM's and suddenly rolled off the throttle.But you Shouldn't feel any backlash to cause a concern unless there is something wrong in the drive or drive shaft.
A trike take off is the way to go.When you have the drive off,you can then inspect the front u-joint for wear.If it's loose (there shouldn't be any play) then their is the issue.
If it's tight (no play) then you had a bearing in the drive going out causing the noise/lash.
Not uncommon for a drive to go out.mileage is normally around 100K before that happens,but has happened for what ever reason of earlier mileage bikes too.
No one rebuilds them to know which bearing took a dump because a take off drive is way cheaper and faster to get the bike going again.