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Model: 1999 Thunderbird (standard)
Carbs: Keihin CVK
Airbox: K&N in standard filter box w/ 5 x 1.5" holes
Pipes: Stock
Muffler: TORs
Cams: Stock
Ignitor: Stock
Main Jets: #120 Keihin
Needle: 1 0.020" needle under stock needle
Float Height: 17.5mm
Pilot Jets: #40
Mixture Screws: ~ 2.5 turns
Plugs: DPR7EA-9
Butt Dyno Results:
Small throttle operation good. Smooth to 7000 rpm, no bucking or audible misfire.
WOT test:
Starting @ 2000 RPM in 2nd gear-then WOT. It stutters or bogs for an instant until about 2500-3000 RPM, then it takes off....yippee...until I hit the 6500 RPM pipe restriction spot that only slows it down a little. Doesn't appear to make much difference whether it is hot or cold for this test. But today was a cool day here...didn't even get to 60. This is not something I would do in normal riding anyway. I am almost always over 3000 RPM.
Future thoughts and questions:
If I put another shim or two under the stock needle I think it would help the accelleration @ 70MPH in high gear @ 4000 RPM??? If I put Thruxton needles in, would I need to shim them??? What RPM range do the shim affect? What RPM range does the difference in the tapers between the Thruxton needle and the stock needle affect?
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