ninjette.org

Go Back   ninjette.org > 1986 - 2007 Ninja 250R > 1986 - 2007 Ninja 250R Tech Talk

Reply
 
Thread Tools
Old February 10th, 2022, 12:30 PM   #1
jjkozul123
ninjette.org newbie
 
Name: Brian
Location: Los Angeles
Join Date: Jan 2022

Motorcycle(s): EX250F 2007

Posts: 3
Idling issue 40 pilot jet

I got the 40 pilot jet kit with 110ís.

When I look at my stock carb, I see my 105ís, and theyíre a long tube with a tube which houses the diaphragm needles, however, the 110ís I ordered donít screw into the housing where the 105 is. Is there a special way to install the 110 or what am I missing out on? I ordered a keihin kit off of eBay, one shim for each needles has been installed. Is it possible they sent me the wrong 110ís or does the piece under the stock 105 need to be unscrewed or something. Thanks
jjkozul123 is offline   Reply With Quote




Old February 10th, 2022, 03:17 PM   #2
ducatiman
ninjette.org certified postwhore
 
ducatiman's Avatar
 
Name: Gordon
Location: new york
Join Date: Sep 2009

Motorcycle(s): '95 DUCATI 900SS/SP '07 DUCATI SS800 '19 HONDA CBR650R

Posts: A lot.
MOTM - Nov '18, Mar '17
nd1.jpg

Main jet (circled in red) simply screws into the long emulsion tube. Mains can be removed in place. Perhaps using an 8mm wrench on the tube (to keep the tube from spinning) will help?
__________________________________________________
gordon@customcarbservices.com
Custom Carb Service
www.customcarbservices.com
ducatiman is offline   Reply With Quote


Old February 10th, 2022, 05:33 PM   #3
jjkozul123
ninjette.org newbie
 
Name: Brian
Location: Los Angeles
Join Date: Jan 2022

Motorcycle(s): EX250F 2007

Posts: 3
https://ibb.co/YtTwBZr

So does that mean that the circled green part is where the jet screws into? Do I have to hold it with one hand and unscrew the old 105 jet with the other? Would the 105 in any way improve my starting issue. The 40 has improved it but not necessarily cured it altogether.
jjkozul123 is offline   Reply With Quote


Old February 10th, 2022, 09:24 PM   #4
DannoXYZ
ninjette.org certified postwhore
 
Name: AKA JacRyann
Location: Mesa, AZ
Join Date: Dec 2011

Motorcycle(s): CB125T EX250F-street Ninja250R-race CBR250R-MC19 CBR250RR-MC22 NSR350R-MC21 VF500F CBR600RR VFR750F

Posts: A lot.
MOTY - 2018, MOTM - Nov '17
Carbs have multiple circuits which supply petrol at different operating zones. Main and pilot jets really don't have much to do with starting. That's mostly choke-circuit. Rather than replacing jets, which represents only small portion of petrol's flow path, you'll want to clean entire path from beginning to end. Starting at tank & petcock.

Here's good photos of all circuits that need thorough scrubbing with brushes and PEA-base fuel system cleaner (also shows where choke-jet is located). http://n4mwd.blogspot.com/2013/10/se...-passages.html

Recent case had choke-jet so clogged, it needed to be drilled out! Then bike would start much easier. Try poking it out with soft copper wire first.

DannoXYZ is offline   Reply With Quote


1 out of 1 members found this post helpful.
Old February 11th, 2022, 05:50 AM   #5
ducatiman
ninjette.org certified postwhore
 
ducatiman's Avatar
 
Name: Gordon
Location: new york
Join Date: Sep 2009

Motorcycle(s): '95 DUCATI 900SS/SP '07 DUCATI SS800 '19 HONDA CBR650R

Posts: A lot.
MOTM - Nov '18, Mar '17
Quote:
Originally Posted by jjkozul123 View Post
https://ibb.co/YtTwBZr
Would the 105 in any way improve my starting issue. The 40 has improved it but not necessarily cured it altogether.
clearly a pilot jet/screw position/pilot jet truly clean/able to flow type issue. Resorting to oversized 40's is masking an underlying problem (partially clogged pilot jet/port). Consider adequate valve clearances are critical to starting as well.
__________________________________________________
gordon@customcarbservices.com
Custom Carb Service
www.customcarbservices.com
ducatiman is offline   Reply With Quote


3 out of 3 members found this post helpful.
Old February 11th, 2022, 07:16 AM   #6
jkv45
Rev Limiter
 
jkv45's Avatar
 
Name: Jay
Location: WI
Join Date: Jul 2013

Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes

Posts: A lot.
MOTM - Jun '18, Oct '16
What modifications have you done to the engine?

They almost never need larger (40) Pilot jets to run right, even with pods. You may end up with the idle mixture screws farther out with the stock 38s, but you should be able to get the proper setting.

110s are plenty rich as well. We ran 108s with pods and a leaky stock exhaust, and it was plenty rich. Probably could have just stayed with the 105s.

Unless you need to make major mixture corrections due to extensive engine mods, going richer isn't going to be any better - and probably worse.
jkv45 is offline   Reply With Quote


1 out of 1 members found this post helpful.
Reply




Similar Threads
Thread Thread Starter Forum Replies Last Post
Pilot jet Ram Jet 1986 - 2007 Ninja 250R Tech Talk 6 May 6th, 2017 02:05 PM
#40 Pilot Jet mrscbw 2008 - 2012 Ninja 250R Tech Talk 1 April 11th, 2011 11:33 AM
Re-questioning #40 Pilot Jet... GiGs 2008 - 2012 Ninja 250R Tech Talk 38 December 24th, 2010 08:30 AM
change pilot jet? drstimpy 1986 - 2007 Ninja 250R Tech Talk 9 July 11th, 2010 12:42 PM
pilot jet drstimpy 1986 - 2007 Ninja 250R Tech Talk 7 April 26th, 2010 08:03 AM


Thread Tools

Posting Rules
You may not post new threads
You may not 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

Forum Jump


Motorcycle Safety Foundation

All times are GMT -7. The time now is 06:57 PM.


Website uptime monitoring Host-tracker.com
Powered by vBulletin®
Copyright ©2000 - 2023, Jelsoft Enterprises Ltd.
User Alert System provided by Advanced User Tagging (Lite) - vBulletin Mods & Addons Copyright © 2023 DragonByte Technologies Ltd.
Except where otherwise noted, all site contents are © Copyright 2022 ninjette.org, All rights reserved.