now that twin cams are getting a bit old they really are very reliable with a few specific things to watch out for. post 2007 lifters is number one, cranks are number two for big power builds, and compensators. i changed the inner cam bearings since it was apart. i replace all seals and bearings on any assembly i have to take apart. i changed the compensator because there was one worn part, no way to get a new one, i had to remove the compensator when changing the rear gear ratio. lifters every 20 or so and they last. a friend has a 88. put the 95 kit in new. installed a gear drive cam when the rear cam bearing issue surfaced. has just ridden it since - well over 100,000 miles with no other actual work other than a rear brake cartridge, brake pads, tires, and a couple of batteries. my 07 had a couple of immediate problems .. got the cylinders bored, new pistons and rings at 500 miles from poor seal. and its been trouble free - sidecar since new so its loaded real good and there are no issues "knock on wood"