This feels like an old topic but j don't think I've seen a definitive answer. I've got pretty damn good at rejetting, shims, needles, pilots etc, and got the bike running nicely.
I recently acquired a used set of Predators to upgrade from the TORS. The TORS are already more open than stock pipes, and Preds more open still.
The question is, do I have to rejet? Just because the Preds might allow more output, surely the engine won't push more than I give it? Does a mixture become more lean just by putting more open pipes with no other changes? So do I go up from my 120's, bearing in mind 42's, Thrux needles with one shim? (I know, but it's where the bike is happiest... )
I recently acquired a used set of Predators to upgrade from the TORS. The TORS are already more open than stock pipes, and Preds more open still.
The question is, do I have to rejet? Just because the Preds might allow more output, surely the engine won't push more than I give it? Does a mixture become more lean just by putting more open pipes with no other changes? So do I go up from my 120's, bearing in mind 42's, Thrux needles with one shim? (I know, but it's where the bike is happiest... )