Can a KLR Vapor Lock? - Kawasaki KLR 650 Forum
2008+ KLR650 Wrenching & Mod Questions For repair, maintaining or modifying discussions related to the newly updated 2008 and beyond, Generation 2 KLR650 Motorcycle.

 
LinkBack Thread Tools Display Modes
post #1 of 8 Old 08-31-2014, 10:43 PM Thread Starter
D C
1st Gear
 
Join Date: May 2013
Location: Panhandle of Texas
Posts: 66
Can a KLR Vapor Lock?

I'm old school, whenever I get of the 08 KLR I turn the OEM petcock to off. The bike has sat in the sun for a couple days. It has been hot here in Texas 100 degrees. The metal on the bike was pretty hot when I went out to it. Started ok, but died down the street. Opened the gas cap, no rush of air. Would start with choke. With the choke on, it ran got it running down the road, eased the choke off and it ran fine. Now problems at all now. Just got back from a ride and it ran great. Any ideas? It has always had non ethanol gas, and is ridden at least 5 days a week, usually everyday.

The way it acted reminded my of the old days when the cars had carbs, and would occasionally vapor lock. Is that possible on a KLR? Or is it a dirty carb?
D C is offline  
Sponsored Links
Advertisement
 
post #2 of 8 Old 09-01-2014, 08:02 AM
3rd Gear
 
Toney's Avatar
 
Join Date: Mar 2010
Location: Oliver Springs TN
Posts: 761
It's a gravity feed fuel system. Vapor lock refers to a instance where the fuel in the fuel pump warms up and becomes a gas. Happened when fuel pumps were mounted to the engine block.

Sounds like you had a little dirt in the carb and the bike just digested it and spit it out the exhaust.

“Take the risk of thinking for yourself , much more happiness , truth, beauty, and wisdom will come to you that way.” Hitchens
Toney is offline  
post #3 of 8 Old 09-01-2014, 08:21 AM
Lifetime Member
 
650Stew's Avatar
 
Join Date: Jun 2010
Location: Alberta, Canada
Posts: 2,480
I was going to suggest tossing a little Seafoam in the gas tank in case you had a bit of water in the gas.

650Stew is offline  
 
post #4 of 8 Old 09-01-2014, 12:23 PM Thread Starter
D C
1st Gear
 
Join Date: May 2013
Location: Panhandle of Texas
Posts: 66
Thanks, went out this AM ran like a champ
D C is offline  
post #5 of 8 Old 09-01-2014, 03:27 PM
3rd Gear
 
Toney's Avatar
 
Join Date: Mar 2010
Location: Oliver Springs TN
Posts: 761
Quote:
Originally Posted by D C View Post
Thanks, went out this AM ran like a champ
that's great! Nothing like a bike that fixes itself! Kind of like the movie Christean when the car never dies. Might consider naming the bike that

“Take the risk of thinking for yourself , much more happiness , truth, beauty, and wisdom will come to you that way.” Hitchens
Toney is offline  
post #6 of 8 Old 09-02-2014, 01:53 AM
4th Gear
 
GoMotor's Avatar
 
Join Date: May 2014
Location: Texas
Posts: 1,233
I agree with Toney that the term vapor lock comes from mechanical fuel pumps mounted on the blocks of automobile engines and usually near the exhaust manifold getting so hot that the gasoline in them vaporized and they were unable to pump the vapor.

I have experienced something similar on only three occasions on my KLR. On those occasions the weather was extremely hot and I sat and idled for very long times due to wrecks at rush hour on freeways twice near downtown Houston and once on the Mississippi River bridge at Memphis. I am certain that the gas in the tank was near boiling and this hot gas got even hotter in the float bowl next to the very hot exhaust pipe. The bike still idled fine, but when the traffic cleared and I opened the throttle a little to move on, it sputtered and lost power at over 1/8 throttle. I think the hot gasoline was boiling off as it went from the higher pressure in the float bowl to the lower pressure in the carb venturi and with the needle jet full of bubbles not enough fuel could get through. As I moved on and got some air moving by the float bowl I was able to give it more and more throttle until after about 3/4 mile it would take half throttle.
GoMotor is offline  
post #7 of 8 Old 09-03-2014, 06:01 PM
2nd Gear
 
clogan's Avatar
 
Join Date: Dec 2010
Location: Tennessee
Posts: 323
Every time I drop my KLR it refuses to restart until I wait 5 minutes or so. Don't know why, but it has happened enought time that I now automatically take a rest break after picking the bike back up on the side stand. Probably doesn't answer OP's question, sorry.

"Chet from Chattanooga"
2009 KLR, blue
clogan is offline  
post #8 of 8 Old 09-03-2014, 06:34 PM
4th Gear
 
GoMotor's Avatar
 
Join Date: May 2014
Location: Texas
Posts: 1,233
Quote:
Originally Posted by clogan View Post
Every time I drop my KLR it refuses to restart until I wait 5 minutes or so. Don't know why, but it has happened enought time that I now automatically take a rest break after picking the bike back up on the side stand. Probably doesn't answer OP's question, sorry.
Most likely flooded some gas from the float bowl into the carburetor throat while on its side causing a flooded situation in a hot engine. I pick mine up and open the throttle wide open and crank the engine over to clear out the excess gas. After about five or six turns it fires right up and I release the throttle.
GoMotor 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



Similar Threads
Thread Thread Starter Forum Replies Last Post
"cruise control/throttle lock" for a KLR? Bigbird Gadgets & Gizmos 14 03-19-2016 04:54 PM
Trail tech Vapor stealth speedometer and tach KLR Thumper 2008+ KLR650 Wrenching & Mod Questions 26 01-17-2016 10:12 AM
My klr acts like it's vapor locking Mtgrizzlymn 1987 to 2007 Wrenching & Mods 64 12-30-2014 08:01 PM

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