air/fuel ratio - Kawasaki Teryx Forums: Kawasaki UTV Teryx Forum
Kawasaki Teryx Performance Discussions Kawasaki Teryx performance discussions.
Engine mods, CDI boxes, exhausts, etc.

User Tag List

Reply
 
LinkBack Thread Tools Display Modes
post #1 of 18 (permalink) Old 04-26-2009, 12:43 PM Thread Starter
Junior Member
 
Join Date: Oct 2008
Location: Catlettsburg, KY
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
Question air/fuel ratio

Alright, so I broke down and bought an air/fuel ratio meter. Installed and took it for a ride. Idle is at 10, and at 1/4 throttle is goes to 10.9 and at half throttle and full throttle is stays at 10.9 and jumps around a little bit up to 11.9. When you let off the throttle it jumps way up to 16. Not sure what I need to do, or if this is alright. Any suggestions would greatly be appreciated.
dustyroads is offline  
Sponsored Links
Advertisement
 
post #2 of 18 (permalink) Old 04-26-2009, 12:59 PM
Senior Member
 
Teee-rible's Avatar
 
Join Date: Apr 2008
Location: Southern Indiana
Posts: 668
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
What other mods do you have...
First I would open up the air jet some on the bottom, how many turns you at?
Right now your too rich, smaller jetting for 1/2 to wide open throttle, do you know what jet size is in there?
If you hitting 16 on decel, need bigger pilot jets....
Teee-rible is offline  
post #3 of 18 (permalink) Old 04-26-2009, 07:48 PM
Senior Member
 
Join Date: May 2008
Posts: 3,999
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
You said jumps up to 16. Does it have another number first then just kick up really quick and short to 16?

Also is it backfiring? If not don't do anything.

Jet backwards.

Start at WOT first, come down about 10 on the mains

Get it right then set your needle at half throttle. Moving the clip up leans it up and moving it down fattens it up.

I would not worry so much about idle unless it runs rough or back fires.

You would turn the screw in to lean it up, it is a idle fuel screw not a air screw. I have not seen a carb with a air screw on it in a while all the UTV's have a screw that controls fuel at idle. The more you turn it in the more fuel it cuts off.



Hunterworks is offline  
 
post #4 of 18 (permalink) Old 04-26-2009, 10:28 PM
Senior Member
 
Teee-rible's Avatar
 
Join Date: Apr 2008
Location: Southern Indiana
Posts: 668
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
I had "assumed" everybody knew, the more you turn it in, the more it leans it (bringing air in thru the venturi...or air jet port hole) that's why "I" call it an air screw, hence the term I used was opening up....probably a poor choice of words......see....this is why you (Todd) should explain it and not me.

I guess I don't understand about the hitting that 16 point, is that something with the meter that I don't know about? If you are hitting 16 on deceleration, then I thought that meant pilot jets are too small, and you need to go with bigger pilot jet to let more fuel thru the pilot jet holes? I am not meaning to argue...I am just dumber than owl shit and need some education, mine sure is running top notch right now though. So....do we need to go thru the tuning procedure....if so...let's do it....so everyone else doesn't have "these" problems....the first step is to have the initiative and patience to do it and NOT rely on somebody elses settings, because my neighbors isn't the same as mine.
Teee-rible is offline  
post #5 of 18 (permalink) Old 04-27-2009, 06:25 AM
Senior Member
 
Join Date: May 2008
Posts: 3,999
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
Tee,

You are right if turning the screw out does not fix the high number then a bigger pilot jet would be in order.

What is funny is the idle number compared to the decel. He is already a little fat at idle and a bigger pilot will make it worse unless he turns the fuel screw in which would make changing it a moot point.

The fact is you never worry about decel numbers unless it is causing you problems like backfiring.



Hunterworks is offline  
post #6 of 18 (permalink) Old 04-27-2009, 08:08 AM
Senior Member
 
Magellan's Avatar
 
Join Date: Jun 2008
Location: Western, NC
Posts: 1,029
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
I get momentary numbers as high as 16 (I think that is as high as the meter reads) going down my steep driveway, as soon as I touch the gas they go back down to 12 or less. I don't change my pilots unless I have to have the screw more than about 2.5 turns out or more because A) they are not as effective at more than about 2.5, and B) the screws can vibrate out which has happened before on an ATV I used to have.

He already is pretty fat in the 10's throughout his throttle range. His readings actually look really good but on the rich side for all but the main and even it could be considered rich to some people. On my machine, I run a leaner mid and idle than 10 to try to get the best performance. I try my best to get the Idle and Mid to be at least 11.5 to 12, and I let the main stay in the 11 or so range to keep the machine cool at high throttle.

He did not say which cylinder these readings come from or if the other one matches these numbers he posted.

I also agree with Tee that everybody I know has different size jets that work for them. I get asked a lot what jets I am running and I tell the people asking just what you are saying Tee. Running the same as somebody else has never worked for me, use and trust a A/F Ratio Meter, I have the Muzzy's WEGO III and the NGK I got from Hunterworks.

2011 Teryx Sport
2011 50" STD RZR LE

Last edited by Magellan; 04-27-2009 at 08:16 AM.
Magellan is offline  
post #7 of 18 (permalink) Old 04-27-2009, 09:04 AM
TeryxHQ.com Staff Member
 
DougS's Avatar
 
Join Date: Apr 2008
Location: Alberta, Canada
Posts: 2,107
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 1 Post(s)
 
I thought Kawi motors run best in the 12.5 to 13.2 range. Rich is safe but there is a little more performace to be had.
DougS is offline  
post #8 of 18 (permalink) Old 04-27-2009, 11:21 AM
Senior Member
 
Magellan's Avatar
 
Join Date: Jun 2008
Location: Western, NC
Posts: 1,029
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
Quote:
Originally Posted by DougS View Post
I thought Kawi motors run best in the 12.5 to 13.2 range. Rich is safe but there is a little more performace to be had.
There is definitely a performance difference between 10 and 12 AFR you are right about that.

I have never run any leaner than about 12.5 on L, M or H. I have no idea how lean you can run, but I get good enough power and feel safe where I am so I am sure I am missing out on some power, just not sure how much.

2011 Teryx Sport
2011 50" STD RZR LE
Magellan is offline  
post #9 of 18 (permalink) Old 04-27-2009, 01:35 PM
Senior Member
 
Teee-rible's Avatar
 
Join Date: Apr 2008
Location: Southern Indiana
Posts: 668
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
Quote:
Originally Posted by Hunterworks View Post
Tee,
The fact is you never worry about decel numbers unless it is causing you problems like backfiring.


Ahh, I see, I had assumed to just put the larger one in, thanks..
Teee-rible is offline  
post #10 of 18 (permalink) Old 04-27-2009, 02:47 PM Thread Starter
Junior Member
 
Join Date: Oct 2008
Location: Catlettsburg, KY
Posts: 11
Mentioned: 0 Post(s)
Tagged: 0 Thread(s)
Quoted: 0 Post(s)
 
I have muzzys exhaust, hw carb kit, dalton clutch kit, and Dynatek programmable CDI box.
Todd, it is backfiring on decel. So let me get this right, I need to take main jets down about 10, then set the needle? This is on the front carb, haven't checked the back one yet. Haven't done much work on this type of machine before, so sorry if I sound stupid.
dustyroads is offline  
Sponsored Links
Advertisement
 
Reply

Bookmarks

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki Teryx Forums: Kawasaki UTV Teryx 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



Similar Threads
Thread Thread Starter Forum Replies Last Post
fuel guage kingforce Kawasaki Teryx General Discussions 20 02-13-2009 07:00 PM
Pics of Fuel/Air Ratio gauge header sensor weld on bungs and plugs Magellan Kawasaki Teryx Performance Discussions 24 12-09-2008 05:48 PM
air/fuel ratio meter dustyroads Kawasaki Teryx General Discussions 11 12-06-2008 04:08 PM
fuel pump? puddle jumper Kawasaki Teryx Performance Discussions 2 09-21-2008 08:16 PM
Fuel Gauge dieselpowered Kawasaki Teryx General Discussions 9 03-05-2008 12:44 AM

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
 


1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89