Have anyone figured out what the new firing sequence does for the inline-4?
[will smith voice]oh hell yes...!!![/will smith voice] LOL
in short, it's an I4 masquerading as a 90 degree V4. think the racier 1000cc VFR that honda has failed to give us in spite of their LONG history with multis.
the only thing yamaha did was cut a V8 LENGTHWISE down the crank (what is a V8 'cept two banks of inline fours?). and instead of machining a 180 degree crank? they asked, what if we RETAIN the basic V8 crank's configuration, but just shorten it? this affords a serious packaging, cost of manufacture, and weight benefit over building a traditional 90 degree V4.
to appreciate how this is nothing short of GENIUS thinking, one has to understand how heretofore we have only thought to cut V8's in half PERPINDICULAR to the crank (ie. V4's) so props goes to yamaha. the rear wheel cares not and knows not how the pistons or throws are arranged around the crank. on paper, the resultant firing order for 720 degrees of rotation (2 spins for a 4-stroke cycle) is the SAME as a VFR. also, by shortening the stroke even further from what the last generation R1 (already shorter than everybody else) used gives them a tuning variable for managing torque input to the crank (and thus traction). this, better than what switching to having a piston fire every 90 degrees would really allow in practice. more kudos to yamaha. the other benefit of a short stroke...? simultaneously good top end. omg, that's having your cake and eating it too.
for example, if they were to use the "daddy long stroke" of say the '01-'08 generation gsxr1000...? it would be difficult (albeit not impossible) to make this work. what THAT would be is a highside machine from hell. while all the rest they claim is true, their claims of "uneven firing order" is marketing hype. it's a misnomer. on the contrary, it's VERY even. when you're putting a piston at TDC every 90 degrees... and firing it... in my book, it can't be anything BUT even. this label of "uneven" can only be truly claimed by the D16 and the new RSV4. as you see i've maybe thought about this a lil' bit. LOL