Have had this bike for 2 years. bought it 9 years old with 10200 miles on it. Ran good and started great. Saw 2 factory authorised repairs listed on a web sight that was supposed to stop a miner backfiring problem. #1 a carb warmer,#2 new exhault valves and stiffer valve springs for all. bike now has 17000 miles on it.Should I have this done or not. Will this help the carbon problem they say the bike has.