Am riding an '04 with 37,000 miles. Only about 7k are mine. I bought the bike from original owner who serviced at the local dealer. I checked at the dealer and as far as I can tell maintenance was restricted to fluids only. I have replaced the thrust bearing (in pieces) and done oil and gear oil. I expect that valve settings might affect mileage and possibly heat output. Short of actually going in and measuring are there 'performance characteristics' that would indicate adjustments are necessary? Has anyone noticed changes/improvement to performance (acceleration, exhaust note etc) after following the adjustment protocol?