ninjette.org - View Single Post - K&N #KA-2586 Air Filter

DannoXYZ · November 6th, 2021, 12:52 PM

We need to look at specific models and their factory configurations. Ninja 250 is super-rich in OEM trim. Nowhere is it leaner than 11.8 and mostly in 10-11.0 range under WOT. Ignore beginning of this chart as it's recording delay of slides when throttle is 1st opened. This bike actually has snorkel removed and K&N filter for more air-flow and it'll still way too rich.

It's so rich, that brand-new plugs look like this on stock street bike after 20-min session on track. Not many people use constant WOT very often, other than starting from red-light or getting on freeway. You're missing out on A LOT of power with that much fuel. Both these bikes were on track within same hour.

Compared to my track 250 with full Tyga exhaust and free-flow filter (right). It's got 22% more flow than stock and +22% more power AND it has 2-sizes smaller main-jets than stock. Not to mention the DynoJet needles are thicker at tip than stock to reduce high-end fuel even more. So my track bike is effectively running 3-sizes smaller jets along with all of the higher flow upgrades compared to street bike.

SportRider - Racing on the Cheap - scroll down to "The Nuts and Bolts" section on dyno-tuning. With Area-P full-exhaust, they flowed 18% more air and made +18% more power than stock AND went from factory 98 main-jets down to 95. Area-P exhaust makes about 1-hp less than Tyga.

November 6th, 2021, 12:52 PM	#6
DannoXYZ ninjette.org certified postwhore Name: AKA JacRyann Location: Mesa, AZ Join Date: Dec 2011 Motorcycle(s): CB125T CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR SFV650 VFR750F R1M ST1300PA Valkyrie-F6C Posts: A lot. MOTY - 2018, MOTM - Nov '17	We need to look at specific models and their factory configurations. Ninja 250 is super-rich in OEM trim. Nowhere is it leaner than 11.8 and mostly in 10-11.0 range under WOT. Ignore beginning of this chart as it's recording delay of slides when throttle is 1st opened. This bike actually has snorkel removed and K&N filter for more air-flow and it'll still way too rich. It's so rich, that brand-new plugs look like this on stock street bike after 20-min session on track. Not many people use constant WOT very often, other than starting from red-light or getting on freeway. You're missing out on A LOT of power with that much fuel. Both these bikes were on track within same hour. Compared to my track 250 with full Tyga exhaust and free-flow filter (right). It's got 22% more flow than stock and +22% more power AND it has 2-sizes smaller main-jets than stock. Not to mention the DynoJet needles are thicker at tip than stock to reduce high-end fuel even more. So my track bike is effectively running 3-sizes smaller jets along with all of the higher flow upgrades compared to street bike. SportRider - Racing on the Cheap - scroll down to "The Nuts and Bolts" section on dyno-tuning. With Area-P full-exhaust, they flowed 18% more air and made +18% more power than stock AND went from factory 98 main-jets down to 95. Area-P exhaust makes about 1-hp less than Tyga. Last futzed with by DannoXYZ; November 6th, 2021 at 02:57 PM.