I'm kind of on the same page as Cowpuc on the compression issue. Having owned an '83, 88, 89, two 99's and an '05, I have NEVER had a compression issue on these bikes. Can it happen? Sure it can. If you are having some major issues then of course it would be worth checking. Everybody knows that compression is very important but it's such a rare problem on these bikes that it is certainly not the first thing I would recommend checking. Like Put, I have always checked my carb sync a couple times a year. Usually doesn't need much tweaking if any but it literally takes about 10 minutes to check them.