Top Speed Challenge

[KawPow650]

Hey guys/gals, I'm trying to get the most top end speed out of my 1989 Kawasaki 650SX and i'm looking for some expert advice on anything i might be missing but here's what i got:

-Full Coffman Exhaust System
-44mm Keihin Carb w/ v-stack
-Boyesen Power Reeds
-West Coast Intake Man.
-Ported & Polished Exhaust Man.
-Ported & Polished Jug & Crankcase
-West Coast High Comp. Cyl. Head
-Wiseco Domed Pistons
-Jetlyne Stainless Steel Impeller 16 Pitch
-Westcoast Intake Grate
-Westcoast Ext. Ride Plate
-PJS Steering/Pump Nozzle (Polished)
-Polished Jet Pump Housing
-Removed Oil Pump & Installed Block Off Plate
-Removed Crankcase Water Drain & Installed Block Off Plate

I think this covers all mods done so far. If anyone has anything to throw out there, I would love to hear any thoughts or ideas to get a few more h/p & mph out of this thing. My goal is to get 55mph top speed from this ski (w/ wind & water conditions in my favor). I was trying to think of anything i could do with the haul, but no ideas yet. Also, playing with shimming the ride plate for best trim and minimize pump cavitation. I was wondering about the Aquavein, does anybody have any feedback on that? Seems like it would be better for low to midrange hook up (too much drag for high end).

 

[Big Kahuna]

your CDI is going to hold you back with the built in rev limiter. other than that you got a good setup. Dales use to do a mod, or you can find a 1986 CDI, I believe this one has a higher rev limiter setting, I just remember something about the CDI's changing in 1988 or so.

 

[Magnum Mike]

there is some good reading here, especially about "seeking" over 46mph on the SX hull http://groupk.com/k650.htm

 

[TheBuzzard]

86 X2 coil has no rev limiter. dual carbs are going to rev higher than a single. i had a couple 52mph x2s back in the day. both had dual 38 carbs. top loader grate loses you about 1 mph top speed.