Hi!

I have a xt660x without any mods, I used to have pciii, but now the bike is almost stock.

Tps is on stock position and the co is at +10 from the stock reading.

The problem is that sparkplug nose gets black and dies every 3-4 months. In winter is worse the bike does not start in the morning if the spark plug is not new, but the bike starts eg in the noon.

My mechanic said propably I have to change the tps with a new one but I am not sure. Any ideas?

Also another question, if I change the speedometer with a new one or second hand, will I lose the ODOMETER reading?