I have 2016 Model (Bought in March 2016) and have done quite a few upgrades from KLX kit , Exhaust, MC Mod, Petcock, 22 cent, L mod to many other and I am really happy how the motorcycles runs but there is one constant issue which I am not able to resolve yet and clueless about it so far.
After I ride 70 plus miles or so continuously, I notice that exhaust sounds too loud all of sudden ..to the extent that sound hurt my ears and motorcycle power drops considerably(pulling beyorn 65 mph becomes a struggle).
But if I stop the engine and restart, it's back to normal sound and power. Now, it doesn't happen always so I am not sure whats going on. I thought it might be a vapor lock issue or vacuum issue (as another friend suggested). I replaced the petcock with what eagle mike provided by passing vaccum, I also replaced the fuel line with new braided one, removed those two pink valves from inside the gas cap and blew some WD40 through vacuum vent.
Yesterday it was too hot here in new york (112 F ) and I took it for a ride to upstate new york and this issue resurfaced again. Loud (too much treble) exhaust and lost power then I stopped for a sec to check maps and when i restarted it ran great like nothing happened!
I love and am happy with how motorcycle is running in general but this issue is killing me.
Anyone has any clue about this? I've done 7k miles on it so far with valve adjustments.