I'm a 87 fan too!
That's a nice looking bike, mine is the blue and white 87.
You mentioned going to a 52 on the rear sprocket. Don't you mean going to a 48 for better top end? If you go to a 52, you will have less top end speed. Honestly, it's hard to beat the 14/50 combo that Yamaha came up with.
Do your research on the rear shock, a little goes a long way when dealing with eye to eye adjustments in the end.
Also, the 87 is unique in it's charging/starting system. It has the lowest output of all the TW's. So again, a little research for the I phone and extra power outlet might be good beforehand.
Enjoy that bike!