This bike is easy to upgrade. I´ve had mine for 20 yr. and have been able to integrate a Paso ignition, Moto Guzzi alternator, Conti mufflers, 900SS lower end and 10:1 Venolia pop top pistons. I have not changed cams because I prefer the power band in the low and mid-range areas unlike a 900SS which is configured for the top end. This is not a user friendly bike (kick start only) but is a joy to ride the foot hill back roads in Western Washington.