My MegaSquirted Racebike

Or

How I Actually Impressed a Dyno Operator

Well, here it is…one Suzuki SV650 with a little bit of work.

Chassis:

• Started out with an SV that I picked up as a wreck at an insurance auction. Used the frame, motor, and swingarm from that pile
• Had an R1 fork set laying around, so put that on
• Got a great deal on some High-Point (now Carrozzeria) R1 wheels, so I --just had-- to do the back end as well
• R1 brakes front and rear.
• Shock is a Penske
• Both ends were setup by the folks at GP Suspension
• Vortex subframe and fairing stay
• Motobits (of course) rearsets

Motor work is pretty minimal:

• Zlock pistons that are 1mm over, and machined for higher compression
• Carrillo rods
• 1mm larger intake valves, both intake && exhaust uprated to stainless
• Head flow work to match my new intake manifold
• Yoshimura cams
• Arrow exhaust full system
• Lightened rotor to decrease torsion loading on crank

A new intake manifold was cut so that I could match the throttle bodies I built to the port, which was built for a much smaller CV carb. The whole intake tract was then ported to a nice blended taper down to the valves from the 46mm throttle bodies.

Used the stock ignition system. The TPS for the ignition is on my TB, with the MS piggybacked off of the TPS and triggered by the ignition.

There is actually quite a bit of room for the installation. Even for the very large K&N air filtres, once I removed the radiator overflow tank and replaced with something more reasonable.

Throttle bodies are pretty simple. Main body has a bunch of mount points and the spindle with the plate on it. Front is a bolt on velocity stack, and back is a bolt on flange. There is a riser to help locate the injectors, which are mounted in bungs installed in the filter top.

Each TB is mounted to it’s manifold using a couple of hose clamps around some NAPA fuel filler line. Throttle cable is split to actuate each TB independently, rather than engineer a linkage.

I used the fuel level sensor hole in the tank, and made a connector that gravity feeds thru a prefiltre to the pump down below the right side of the engine, just in front of the clutch housing. After going thru the main filter, the fuel hits the regulator that I set to 3bar via the clamp method. Excess goes back to the tank, and there is a feed to the injectors for a sortof returnless system.

The actual controller is mounted in the nose, just below/behind the instruments. I put some foam padding behind, and it is held in place with a bungie cord setup.

FINAL RESULTS:

The stock carbs are CV, at 39mm. The bike was jetted with these on the stock manifolds and airbox for the dyno run. The only difference between this run and the Squirted run is from the manifolds out.

A stock curve is also here, for comparison:

Stock makes 67.8hp@9800rpm, 43.2lb-ft@7700rpm

Modified makes 86hp@10000rpm, 50.8lb-ft@7500rpm

Squirted makes 93.6hp@11000rpm, 52.3lb-ft@8700rpm

I still need to do a bit of midrange tuning. I noticed at the track that at 30-60% throttle I have some lean spots. Once I get above that tho, this thing goes a helluva lot better than me!