Jet kits - Kawasaki Ninja 250R Forum
 
LinkBack Thread Tools Display Modes
post #1 of 10 (permalink) Old 02-12-2013, 02:22 AM Thread Starter
Senior Member
 
Tattooedloser84's Avatar
 
Join Date: Jul 2012
Location: Lancaster pa usa
Posts: 268
Jet kits

I was wondering if anyone on here pieced together your own jet kit? I'd like to get one but don't wanna pay $70+ for it if anyone can recommend the jet sizes I might try that would be great, I've a a set a Yoshimura slip Ons and might do pod filters as well thanx

Droid Bionic
Tattooedloser84 is offline  
Sponsored Links
Advertisement
 
post #2 of 10 (permalink) Old 02-12-2013, 06:05 AM
Senior Member
 
DaBlue1's Avatar
 
Join Date: Jul 2011
Location: NC
Posts: 478
Why do you want to do pod filters?
Have a look at this thread. https://www.250r.net/forum/showthread.php?t=1209
DaBlue1 is offline  
post #3 of 10 (permalink) Old 02-12-2013, 07:14 AM Thread Starter
Senior Member
 
Tattooedloser84's Avatar
 
Join Date: Jul 2012
Location: Lancaster pa usa
Posts: 268
Re: Jet kits

Mostly to make the carb work easier

Droid Bionic
Tattooedloser84 is offline  
Sponsored Links
Advertisement
 
post #4 of 10 (permalink) Old 02-12-2013, 08:41 AM
Senior Member
 
DaBlue1's Avatar
 
Join Date: Jul 2011
Location: NC
Posts: 478
Quote:
Originally Posted by Tattooedloser84 View Post
Mostly to make the carb work easier

How much carb work do you plan on doing? In 4 years I have not had my carbs out once. I know once I pull them out, take off the airbox, change the jets and install pods I may have to take them out a number of times to tune them. For what? To get the same result that I would get if, I left the airbox, carbs and stock jets in, shimmed the needles and installed a full exhaust instead?

You have slip ons, right? Why not shim the needles? Why make maintenance harder by putting on pods? I get that putting on pods and installing bigger jets may get you more HP, but realize that HP comes at the top of the rev range. Who rides around @ 11-12k all day or daily commuting?

If you look at most dyno sheets for Ninja 250s you'll notice that the difference, where that a stock bike and a jetted, full exhaust bike make the same HP, is only about 200-500 rpms up til about 11k rpm.

Racers of the Ninja 250 (especially the new gens) can make close to 30 HP with just a full exhaust on a stock bike. About the same that those who remove the airbox and install pods get. I very seriously doubt they pull the carbs on a regular basis to tune them simply because they've gotten about 99% of the max the carb will put out.

Where do you want the most benefit of HP on your bike? Cruising rpms or WOT?

These were just a few questions and some info for your benefit. Good luck in in jetting quest.

Some good info to read.

How Constant Velocity Carburetors Work
http://www.motorcycleproject.com/mot...bs_work_v3.swf

Motorcycle Carburetor Theory 101
https://docs.google.com/file/d/0B8nS...eDg/edit?pli=1

Pipe Jetting (A Must Read)
http://www.motorcycleproject.com/mot...s-jetting.html

Carburetor Jet Tech
http://www.motorcycleproject.com/mot...et_tech_v3.swf

Last edited by DaBlue1; 02-12-2013 at 09:25 AM.
DaBlue1 is offline  
post #5 of 10 (permalink) Old 02-12-2013, 11:59 AM Thread Starter
Senior Member
 
Tattooedloser84's Avatar
 
Join Date: Jul 2012
Location: Lancaster pa usa
Posts: 268
Re: Jet kits

I did shim the needles and it seems to idle better now. I'll read over the links you posted and think about my decision

Droid Bionic
Tattooedloser84 is offline  
post #6 of 10 (permalink) Old 02-12-2013, 04:37 PM Thread Starter
Senior Member
 
Tattooedloser84's Avatar
 
Join Date: Jul 2012
Location: Lancaster pa usa
Posts: 268
Re: Jet kits

I got a chance to read the pipe jetting link you posted, thanx I think I'll just try and tweak stuff instead of a jet kit and pods

Droid Bionic
Tattooedloser84 is offline  
post #7 of 10 (permalink) Old 02-12-2013, 05:07 PM
Senior Member
 
DaBlue1's Avatar
 
Join Date: Jul 2011
Location: NC
Posts: 478
Some small things that you can do to help enhance what you already have.

Iridium Spark Plugs-uses less energy, better spark (better spark = better combustion= improved engine performance
K&N Air Filter KA-2586-(drop in)
Synthetic oil
87 Octane ethanol free gas- (if you can get it)
More shims- Depending on the size (thickness of your shims) you may what to add one more. (For example 1 Factory Pro washer is about 0.54mm thick. I have two washers that mic @ 1.53 mm.so you can either move the needle up 1 mm with 2 Factory Pro washers or 1.5 mm with another brand 3 mm washer. 1 washer really doesn't do much.)

DaBlue1 is offline  
post #8 of 10 (permalink) Old 02-12-2013, 06:37 PM Thread Starter
Senior Member
 
Tattooedloser84's Avatar
 
Join Date: Jul 2012
Location: Lancaster pa usa
Posts: 268
Re: Jet kits

I've been using synthetic oil, and I do have a new UNI air filter but I'm pretty sure it's a factory replacement bc its the same foam filter. Also shimmed using 2 4mm washers per needle. I'm probably due for new spark plugs ill look into them and the K& N filter as well

Droid Bionic
Tattooedloser84 is offline  
post #9 of 10 (permalink) Old 06-18-2013, 11:30 PM
Junior Member
 
Join Date: Jun 2013
Location: United State
Posts: 2
You should always oil filter maintenance, then your bike performance is best and your bike life for a long time.






plagiarismsoftware.net - avoid plagiarism software

Last edited by Brendon77; 08-06-2013 at 02:37 AM.
Brendon77 is offline  
post #10 of 10 (permalink) Old 01-29-2015, 03:15 PM
Junior Member
 
Join Date: Jan 2015
Location: qwerty
Posts: 13
Interesting plot there. Seems like a really nice read. Good luck with it in the future!
Apple213 is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Tags
jet, kits

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Ninja 250R Forum forums, you must first register.
Please enter your desired user name, your email address and other required details in the form below.

User Name:
Password
Please enter a password for your user account. Note that passwords are case-sensitive.

Password:


Confirm Password:
Email Address
Please enter a valid email address for yourself.

Email Address:
OR

Log-in










Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode



Posting Rules  
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

 
For the best viewing experience please update your browser to Google Chrome