Stroker IS going bigger guys... :-)
I've got a 4 5/8 stroke in my Evo, runs great. I've been thinking about going the stroker route with my current bike when I replace the crank. But most likely will stick with the 4 3/8's stroke and go with bigger bore.
Strokers present several challenges. Fewer piston choices without going custom. Potentially taller engine. Higher piston speeds and shorter engine life. Cases typically need clearancing (at least Evo's do). That said, 4.5 X 4.060 = 117" but to keep this in perspective you can also get 117 with the same 4 1/8 bore and (stock) 4 3/8 stock stroke. The S&S 106" jugs (3 7/8) will require custom pistons to go with a longer stroke or you can sell them.
That said, if you want a 124, you will need a stroker crank and bigger bore. Better to pick up a complete engine in that regard.
You definitely should discuss with your builder, or A builder if you are going to do this yourself. Some combo's just don't work well and you can dump a crap load of money into a stroker build and be unhappy with the result.
Last edited by rageglide; 06-01-2013 at 01:15 PM.