Fist off, let me say that I do not work for RK Tek, or SLP. I bought my wife an 08 M8, and after riding it a couple times - figured it needed a little more. I put a call into Kelsey @ RK Tek and after discussing my elevation and fuel I wanted to run, he built me a head and set of domes, as well as a torsional secondary kit with a 38/34 progressive helix. Also provided me with spring recommendations as a starting point. Good turn around too - I ordered it in the silly season (November). Anyway, I installed the head first and went riding - cleaned up the mid and top end, runs cooler, better throttle response. Added the clutch kit - much better upshift and backshift, clutches are cooler (used cat gold in primary with stock weights). I decided to add an SLP single with y-pipe and can next, along with high flow intake and my own version of additional air inlets to the plenum (6 bullseyes), and a boondocker box to tune with. Also added a Koso EGT guage to keep an eye on temps. After a little tuning, all I can say is WOW! I pretty much had to add fuel across the board to keep EGT's, plug color and wash in line, but the machine pulled 600 rpm more then stock (added weight to the primary to bring down to 8100). I settled on a running rpm of 7950-8000 - this is where the sled pulls the best. Both products are very good in terms of fit and finish, and you would think they were designed to work as a package - it works that well. When it was stock, it stood no chance against my friend's 08 800XP in a 154 -(it was regeared, has some light goodies, head and can). Now the only place he can beat me is on the trail. Sorry guys - the rev suspension is wayyy better in the bumps. I've not dyno'd it - but it works better than my M1 did in stock form, and I can come close to the marks left by the M1 now (it is modded with SLP set, RKT head and clutch, 156 x 2.5", lightweight rotor, VE tunnel, etc, etc.
Oh ya - both sleds have boss seats and risers, aftermarket skis, and additional venting.
So, thanks to Kelsey and SLP! The industry needs more people like you, instead of those that claim one thing and provide another. Thanks again.
Oh ya - both sleds have boss seats and risers, aftermarket skis, and additional venting.
So, thanks to Kelsey and SLP! The industry needs more people like you, instead of those that claim one thing and provide another. Thanks again.
