Hey everybody,
Hi and welcome to my forum.Recently purchased NX Express Incognito system #60000 for my track 2011 Ninja 250R. Specs on the bike are:
250cc parallel twin, DOHC 4 valves per cylinder 15k redline
Carburetors :Keihin CVK30 x 2 jetted for sea level although I am running at 6000ft-10000ft
Compression: 11.6 to 1
Horsepower: 34
I guess you haven't seen the posts made by our resident Ninja 250 owner/expert - I think you'll find the following thread worth reading; viewtopic.php?f=12&t=6317My question is about the jetting. The bike is currently jetted for sea level as delivered from japan. When I take the bike down to lower elevations it feels literally twice as fast and will pull fairly hard to about 95 where it tops out(although it has 5000k rpm to the redline with the re gearing).
At high elevation it tops out at 87 and takes a looong time to get from 80 to 87, around a minute at wide open throttle. If I install this kit with the smallest jet(14), fogging the airbox in front of the filter, how much of a richer re-jet would be needed at high elevation?
You would NOT need to re-jet to be richer, you would need to re-jet to be LEANER, as there is already less oxygen at higher altitude, so what you need is either more nitrous or LESS fuel. I can't predict how much adjustment would be needed but I'll be able to guide you safely to determining what's needed very easily and we have a suitable range of jets to be able to deal with that. My goal is to get this bike to do at least 100 so I can keep up with lighter riders on the straights. Thanks for any help you guys can offer, this is my first time running juice
That'll be a breeze.Here's what I'm thinking on the elevation issue: On avg we loose about .5 psi per 1k ft, so 6k-8k ft where i live is a loss of 4 psi; 1 bar - 4 psi is 10.7 psi, so i could run stock jets stock everything and turbo charge it up to 4 psi without changing a thing and it would be like i was at sea level(peak hp), conversly i can nitrous charge it say 15 hp and only be up say 5 hp from a stock one at sea level(estimations).
Turbo wise that's correct but you don't seem to be on the right track with the nitrous, unless I'm misunderstanding you.