Just went through the process of building a round fin SP engine with the aim of adding some pep to its step, but not killing its reliability. The gains were modest but worthwhile, and completely transformed the character of the engine! Even the cost of these modest gains was not cheap, I would hate to see the bill of squeezing 100rwhp out of it, and would not have much hope of it lasting too long ;)
The specifics of my engine are
Gilardoni 950 SP1000 piston/barrel kit
Std crank and rods ( new bolts of course)
Std timing chain setup
Std 1000sp heads with heavy duty valve springs,
and intake ports cleaned up to suit larger carbs and manifolds
36mm Dellorto's and straight 36mm alloy intake manifolds
B-10 cam
Ergal 1.5kg alloy flywheel and lightened ringear
Std deep spline twin plate clutch
C-5 optical ignition
Lemans breather
Sump spacer
HTmoto exhaust ( minus Db killers)
This combo when dyno'd while finalizing the jetting falls a long way short of 100rwhp putting out a touch over 60, has a big flat torque curve, and has proven to be very streetable, and performance wise on a par with the earlier lemans spec bikes, it wasn't a cheap exercise even doing it my self and would hate to see the final cost of wringing out another 40hp! Below is the dyno chart, never been able to find the specs for the stock SP engine, but she is a totally different beast these days ;)
This is awesome. Good information. This may ne worth doing some winter... just cause. Thanks!!
