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Old April 18th, 2012, 10:44 AM   #86
adouglas
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Name: Gort
Location: A secret lair which, being secret, has an undisclosed location
Join Date: May 2009

Motorcycle(s): Aprilia RS660

Posts: A lot.
Blog Entries: 6
MOTM - Jul '18, Nov '16, Aug '14, May '13
update: Now 2 turns out. Tried one turn but it was not running well. Getting a solid pop when I chop the throttle, and some popping on low-throttle deceleration. Would like to get rid of that... but any more out on the screws and I get the symptoms of over-rich.

Quote:
Originally Posted by adouglas View Post
YEAR: 2008

INTAKE MODIFICATIONS: Snorkel removed, K&N panel filter in stock airbox, Kleen Air system removed and holes plugged

EXHAUST MODIFICATIONS: AreaP QuietCore full exhaust

JET KIT OR STOCK? Jet kit

BRAND OF JET KIT? FactoryPro

MAIN JET: Stock (Keihin #98)

NEEDLE AND CLIP POSITION: Per FactoryPro starting point recommendation - clip in third groove from the top, three washers above

MIXTURE SCREW SETTINGS: Initially 2 1/2 turns out, now 2 1/4, going to try 2 flat. The bike runs just fine at all rpms and loads, but when the throttle is blipped at idle the speed drops below the idle set point and returns.

ELEVATION: Sea level to about 150 feet

MISCELLANEOUS INFORMATION ABOUT YOUR BIKE’S JETTING SETUP:

- Pilot jet replaced with the #40 alternate that came in the jet kit
- DynoJet dynamometer results:
- Peak HP 28.91
- Peak torque 14.37

The dyno guy said "You're fine... you don't need to do anything." He also said his dyno is a bit "tight" and the real numbers may be slightly higher.

Air/fuel was dancing around the "ideal" line... maybe just a tiny bit on the rich side of things overall, but not enough to warrant making any changes.

Fuel economy after a week and two tanks of fuel is between 55 and 63 mpg, driveability is excellent, choke is not needed at startup, and the sound is to die for.

A huge THANK YOU to kkim, who recommended this exact setup. Except for the idle mixture screw settings, he enabled me to nail it on the first try!
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