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I recently installed Thruxton NBZT needles in the CVK carbs on my 07SM, & in a word, WOW! I'm impressed. The motor is bone stock except for minor intake & exhaust changes.
Here is the current setup:
Long TORS (slashcut, straight-through)
B-C ABEK with K&N pods
Kawasaki vacuum springs (lighter rate & shorter than stock)
Thrux NBZT needles w/ one .46mm stainless steel shim
Aftermarket AB-marked 152.5 main jets
45 pilot jets
Stock float height
Air screws less than a half-turn out
It idles great & pulls like a freight train to redline with no hesitation or flat spots. Throttle response is "right now".
I plan to get it back to the dyno again eventually, but if that doesn't happen, it really doesn't matter, as the bike is happy & so am I.
As of this writing I've taken the stock carbs about as far as I reasonably can, short of having them bored out.
Until I go for a stroker motor some day I'm going to enjoy this combo.
Here is the current setup:
Long TORS (slashcut, straight-through)
B-C ABEK with K&N pods
Kawasaki vacuum springs (lighter rate & shorter than stock)
Thrux NBZT needles w/ one .46mm stainless steel shim
Aftermarket AB-marked 152.5 main jets
45 pilot jets
Stock float height
Air screws less than a half-turn out
It idles great & pulls like a freight train to redline with no hesitation or flat spots. Throttle response is "right now".
I plan to get it back to the dyno again eventually, but if that doesn't happen, it really doesn't matter, as the bike is happy & so am I.
As of this writing I've taken the stock carbs about as far as I reasonably can, short of having them bored out.
Until I go for a stroker motor some day I'm going to enjoy this combo.
