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Harley
Davidson Sportster |
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CRB-HD08-1.1-ti $69.95
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Factory "Pro Thunder" Carb Recal Kit Easy to install and tune - NO slide drilling! Factory Pro's Carb Recalibration
kit will add more low-end / midrange, if the proper main jet is selected,
more top-end power. Excellent street manners and specifically
designed to improve fuel atomization without resorting to any flim flam
- Some of the aftermarket jet kits actually decrease fuel atomization and that hurts power and mileage. This kit is nothing like a "Thunderslide" dynojet kit - If you have one of those, getting a new stock slide and slide spring and installing the Factory Pro kit will bring back that smoothness, refinement and lowend power back into your $20,000 machine - This kit includes Factory Pro "Ti" needle, 2 pilot jets and a large selection of main jets to cover both models. Used By TECH CV Carb Tuning for Keihin carbureted HD All kit R&D was done on Factory
Pro's EC997 Dyne System Tuning Tech Notes: K&N air filter: |
 TL-float height gauge $44.95 |
- Smooth and responsive! Factory Ti ProKit
Carb Recalibration kits go in and work - consistently from bike to bike. Easy
to dial in. Factory's Pro's extremely intense involvement in professional racing
programs, including
Bartel's David Estok's Road America Track Record-setting
Twinsports 883 Sportster and Shawn Higbee's Pro Thunder Buell gives us the experience
to design carb recal kits that deliver maximum low-end and midrange without
sacrificing ANY top-end power.
Tech
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Float Height:
When trying to lean out the full throttle / low rpm area.
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13mm is too low to use.
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The pilot jet gets exposed to air at high rpm / full throttle at 13mm.
There are other issues, but they are beyond the scope of most readers.
If you have an EC997 dyno, you can see what they are.
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11mm works. 10mm works.
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12mm "might" work - but if you experience misfire at high rpm / full throttle, the fuel level has dropped just a little bit too much and exposed the pilot jet.
Note:
The float bowl does NOT run out of fuel if the float height / fuel level is lowered - When the engine is pulling max fuel, the fuel level in the carb drops, usually, 1mm-2mm and then stabilizes.
If the float bowl were to actually "run out" of fuel - it would mean that ANY float height setting would eventually run out of fuel if you held the throttle on long enough.
The best way to test that is to use an EC997 dyno and do a LONG full throttle / high rpm test for 6-10 seconds (usual is 2-4 seconds) and watch the 4 gas EGA trace and see if it leans out or not.
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True Rear Wheel Horsepower® Factory EC997a Eddy Current Dynamometer
1200 Sportster
Thunderheader exhaust, Hypercharger intake
CRB-HD08-1.1-HYP carb kit
owner: Dave Cotton, Marin county and San Diego, CA
Carb tuned with CRB-HD08-1.1-HYP carb kit (Factory Pro's own)
Tuned to Best Power and Best Smoothness on EC997 Eddy Current dyne system with 4 gas analyzer
04 / 05/ 06 by Raul and Otto Meono
56+ True HPStock: 43 True hp, after pipe, Hypercharger and dyno tuning at a Factory Pro Tuning Center = 56 True hp.
13 True HP gain.
Big Boyz' HD Cam Specs and other HD related online calculators - click here
Big Boyz uses the Factory Pro EC997 dynamometer for highest quality tuning results!
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