The intake is the same to all intents & purposes as the earlier Exup-Rs but the 'O' rings between the intake rubbers & the cylinder head are the same that can & do split, allowing excess air to weaken the air/fuel ratio leading to uneven running.
I fitted Barnett heavier clutch springs to my Exup-R not long after buying it back in '93. I also bought OEM friction plates, soaked them in engine oil & awaited the time when I would need to install them....& that was 55k miles ago.
I was going to insure & tax the R1, but with the cost of fuel & VED having jumped up again. together with a hike in insurance, i'm going to stick with just the Exup-R & the KTM enduro on the roads/tracks
I too have large stacks of motorcycle mags going back over many years, mainly sport bike mags but also BIKE mag from #1 to about 1985 when they stopped OGRI from appearing.
With the 'Performance Bike' mags I cut out the interesting pages & file them in folders. There's so much advertising that I ...
I fitted some 155 dogbones as an experiment as at the time the 165s meant I was using up too much ground clearance. I also tried some other lengths, but the size I settled on were the 160s, allowing me to adjust the fork heights to get the best 'feel'.
I've been using a ZXR750R clutch master for many years now but only recently changed to a radial front brake master from a Triumph, using the same small reservoirs as in the pic. I don't see the point in carrying so much spare hydraulic fluid, hence the smallest I could find.
A friend down here in Kent had his Exup-RU repainted in those same Yamaha Endurance colours after he had an argument with a car. He rode it down to the Bol at Paul Ricard after fitting an Ohlins shock but the spring was way too hard for his weight, so it affected his ride down through froglandia ...