Originally Posted by munsonbw
As I have read it the auto caps are really not a great choice due to their relief pressures. If I remember correctly the auto ones have a weaker spring and therefore a lower relief pressure than what our cooling systems were designed for.
Not quite right, caps come in various pressure ratings (i.e. 0.9 bar, 1 bar, 1.1 bar, etc)...The Tiger needs a 1.1 bar (16 psi) cap and there are auto equivalents that are rated for that pressure (am looking for one myself, my local Triumph dealer does not stock the cap of course, even though it is a standard maintenance item