KLX, 22c, or nothing? - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

 5Likes
Reply
 
LinkBack Thread Tools Display Modes
post #1 of 11 Old 12-04-2019, 11:17 AM Thread Starter
1st Gear
 
Join Date: Sep 2019
Posts: 19
KLX, 22c, or nothing?

I have a 2006 with a UNI air filter and a Leo Vince exhaust. I ride between 500 and 3K feet right now. Next summer I will be riding between sea level and 7K.

I have a very slight pop with deceleration, no worse than stock.

I had read that at altitude you want a bike running lean. Should I leave the carb alone since I will be spending more time at altitude than not next spring and summer?
FJCONE is offline  
Sponsored Links
Advertisement
 
post #2 of 11 Old 12-04-2019, 11:25 AM
5th Gear
 
Join Date: Aug 2010
Location: Kelowna, B.C.
Posts: 2,619
Even though your mods are minor, the stock KLR runs overly lean at partial throttle and benefits from jetting changes, any mods that help airflow make the lean condition worse. 22 cent mod works but is a bandaid, KLX kit is much better. The CV carb is largely self adjusting for altitude. You could leave it alone, but if it was my bike, I'd install the KLX kit and pull the snorkle (as recommended by Eaglemike) - it will run better.

Dave
DPelletier is offline  
post #3 of 11 Old 12-04-2019, 11:30 AM
Pretty in Pink, dunno why
 
Tom Schmitz's Avatar
 
Join Date: Feb 2009
Location: Redondo Beach
Posts: 7,921
Garage
If you are happy with the current jetting, leave it be. It sounds like, with just a slight pop, that it is not overly lean with that pipe.

The CV carburetor will do a pretty good job of adjusting for altitude by itself. The slide is dependant on vacuum, and therefore air density, to rise. With a lower air density the slide will rise less, admitting less fuel. You'll be down on power, but your mixture will be right.

At higher altitudes, a direct pull carburetor will admit too much fuel for the air density at any given slide position and will run too rich. CV carbs don't work that way, so it's not an issue.

My riding takes me from sea level to 10K feet and I never change anything in the carburetor.
pdwestman, DPelletier and FJCONE like this.

Tom [email protected]

“I still held his automatic more or less pointed at him, but he swung on me just the same. It caught me flush on the chin. It was meant to be a hard one, but a pansy has no iron in his bones, whatever he looks like.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
Noli Timere Messorem

Last edited by Tom Schmitz; 12-04-2019 at 11:57 AM. Reason: Well, Dave and I are saying the same thing, so I deleted it, then undeleted it, then deleted it again, then undeleted it.
Tom Schmitz is offline  
 
post #4 of 11 Old 12-04-2019, 03:25 PM
5th Gear
 
Join Date: Aug 2010
Location: Kelowna, B.C.
Posts: 2,619
I think we're all in agreement; 1) don't worry about the altitude for the reason Tom eloquently expressed, 2) your mods aren't enough to require a jetting change. That said, I prefer the KLX jetting to stock.


Dave
DPelletier is offline  
post #5 of 11 Old 12-04-2019, 03:51 PM
Pretty in Pink, dunno why
 
Tom Schmitz's Avatar
 
Join Date: Feb 2009
Location: Redondo Beach
Posts: 7,921
Garage
Dave's right about that! KLX even on a completely stock bike is the best option.

Tom [email protected]

“I still held his automatic more or less pointed at him, but he swung on me just the same. It caught me flush on the chin. It was meant to be a hard one, but a pansy has no iron in his bones, whatever he looks like.” -Philip Marlowe

“'Why' and 'How' are words so important they cannot be too often used.” -Napoleon Bonaparte

Sting like a butterfly.
Noli Timere Messorem
Tom Schmitz is offline  
post #6 of 11 Old 12-04-2019, 06:27 PM
1st Gear
 
Join Date: Nov 2019
Location: Phoenix AZ
Posts: 40
All the responses are spot on. I'd like to expand Tom's explanation of CV operation. Simply that your right wrist is NOT directly connected to the carb slide. When you turn the throttle tube, either direction, you are 'requesting' the slide to move. Engine vacuum does the actual movement. There are various operations going on in the carb and all have some adjustability on response time and rate of movement of the slide but thats getting a bit deep. Short example...if you are at say 10K feet and running down the road at 70mph you may have the throttle pinned but the actual slide is probably only about 65% open. Thats the advantage...no real need to adjust jetting for altitude. The slide will not open fast enough or far enough to cause engine stalling. Downside is a carb that responds slow compared to carbs like an FCR or FI in modern bikes. There are CV type carbs with an accelerator pump that greatly improves engine response.

The KLX kit simply rejets the carb the way Kawasaki wanted to jet the KLR but EPA would not allow. KLX650 is not road legal thus didn't have to meet EPA/emission standards of the day.
Chuck B is offline  
post #7 of 11 Old 12-11-2019, 08:40 AM
5th Gear
 
Join Date: Jan 2011
Posts: 4,575
Then, there's this extraordinary new developmental needle; gives additional power and fuel economy, along with smoother idle, and . . . oh, never mind!

Damocles is offline  
post #8 of 11 Old 12-14-2019, 08:28 AM Thread Starter
1st Gear
 
Join Date: Sep 2019
Posts: 19
Quote:
Originally Posted by Damocles View Post
Then, there's this extraordinary new developmental needle; gives additional power and fuel economy, along with smoother idle, and . . . oh, never mind!

Tell me more
FJCONE is offline  
post #9 of 11 Old 12-14-2019, 09:07 AM
5th Gear
 
Join Date: Jan 2011
Posts: 4,575
Quote:
Originally Posted by FJCONE View Post
Tell me more
Sorry, FJCONE; "inside" joke regular forum readers may "get!"

Just for the record, the component mentioned remains legendary, no corroborating evidence of its actual existence as described, not unlike the unicorn.

FJCONE likes this.

“You better put down that gun. You got two ways to go, put it down or use it. Even if you tie me, you’re gonna be dead.” "John Russell" (Paul Newman), Hombre
Damocles is offline  
post #10 of 11 Old 12-14-2019, 10:45 AM
OverDrive
 
Join Date: Nov 2009
Location: Lander, Wyoming
Posts: 6,191
Quote:
Originally Posted by FJCONE View Post
Tell me more
I went looking for that thread, for you. But it appears that the Thread Starter has "Deleted it".

pdwestman
Modify at "YOUR OWN RISK"!

Still riding my 1987 KL650-A1. 85,000+ miles & counting
pdwestman is offline  
Sponsored Links
Advertisement
 
Reply

Quick Reply
Message:
Options

Register Now



In order to be able to post messages on the Kawasaki KLR 650 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