Quote:
Originally Posted by DannoXYZ
There is ABSOLUTELY ZERO way any mechanic can tune carbs optimally by ear! This has been proven thousands of times after putting their "tuned carbs" bike on dyno and actually measuring power-output and AFR... way, way off.
Sorry I made typo. "Dyno tuning" is running bike on rollers and using exhaust-analyzer to determine AFR-air fuel ratio. Then changing carb adjustments to get AFR into most-power producing range.
https://www.ninjette.org/forums/showthread.php?t=63914
https://www.youtube.com/watch?v=W7G0UWdsrA4
https://www.youtube.com/watch?v=rL4Gmt_r0cA
Typically on new-gens at least, LOTS of power is added with full-exhaust and removing fuel by going to smaller main-jets. I've seen up to +22% more power just from fine-tuning AFR, which is about twice as much as initial gain from just slapping parts on. On my bike, Spears downsized the main-jets twice after reviewing dyno's AFR data. On 300s, about +14% more power can be gained just from leaning out AFR with no parts changed or added. This is done on dyno again, with re-programming ECU instead of mucking with carbs. Part of better response from 300 is due to 3D ignition-maps compared to 250s 2D map.
Factory foam filter works fine. Problem is lots of people over-oil it and cause restriction. A K&N filter is common replacement. Just two light layers of spray-oil per side is all that's needed to sufficiently oil filter. Or you can use spray K&N filter-oil with factory foam filter as well. |
With what has been said above, is it possible for my mechanic to be able to at the very least, JET the 2005 Ninja 250 enough to where it runs without any issues by ear? I ask because I wants to know if the bike will be ride-able as its my main bike for going to work and back. If you say I need to take it to a profesisonal thats fine, I will take it to a dyna tune place.
Anyone know of a place in San Diego and how much they charge?