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Old 11-09-2010, 08:23 PM
Join Date: Nov 2010
Posts: 2
Unhappy hard starting and backfires

I'm a newbee and would like to say hi to everone.
I have an 09 klr. After a couple of days sitting in the garage my bike will not start until it backfires. After that ir runs fine. Does anybody have an idea as to what my be causing this.
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Old 11-09-2010, 09:32 PM
Extrooper's Avatar
Flight Officer
Join Date: Nov 2009
Posts: 68

Welcome T-bone, normally hard starting is associated with tight valves. You don't state the mileage but if it is beyond 7,500 it could be valve adjustment time. The backfiring is unburned fuel in the exhaust system, again it could be the valves are out of adjustment. I am assuming the carb has not been modified etc.


Last edited by Extrooper; 11-09-2010 at 09:36 PM.
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Old 11-09-2010, 09:38 PM
SLO-KLR's Avatar
Join Date: Sep 2006
Location: Paso Robles, CA.
Posts: 1,333

Adjusting the idle mixture screw to about 2 full turns out from lightly seated should make cold starts much easier. As Extrooper said it might be a good idea to check the valves as well.
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Old 11-09-2010, 09:56 PM
Join Date: Nov 2010
Posts: 2

I have 2989 miles on it. It doesn't do it everytime I start it. Just when it sit for a couple of days.
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Old 11-10-2010, 04:08 AM
Join Date: Sep 2006
Posts: 4,699

Not that any of the other info is incorrect, but the first thing I'd do is go spend $2.50 for a new spark plug.
Just go to the dealer and get a regular factory replacement plug. Nothing fancy.. Talk nicely to them, and they might even give it to you..

I know it sounds silly, but plugs can and will go bad on 4 strokes.. My Honda Recon 4 wheeler was the same way.. Hard to start, backfired..
New spark plug and it starts instantly and runs perfectly..

It's cheap and somewhat simple. If that doesn't work, then start making changes..
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Old 11-10-2010, 05:44 PM
Buildit's Avatar
Join Date: Oct 2006
Location: London, Ohio
Posts: 1,123

Do you turn the fuel off when the bike is sitting overnight?
*** KLR650, Tweeting long before your kids thought it was cool.

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Old 03-30-2012, 12:41 PM
Flight Officer
Join Date: Mar 2012
Location: Washington state ( west side of cascades)
Posts: 34

I too get backfires on my new 2011(just got it 03 03 2012). I am thinking its my fault as I may not have the choke high enough and I also should wait longer ( 5 seconds too short) before trying to restart. My bike fires 90% of the mornings no problem, so I m thinking human error. For example I may touch the trottle and thats bad on start up, then flood the bike then try a restart before gas in pipes disapates then KABOOM. So I just thought I would add this as a posibility.
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Old 04-12-2012, 07:01 AM
Flight Officer
Join Date: Apr 2012
Location: Lower Alabama
Posts: 60

I agree with the new spark plug & shutting the fuel off when parked.......AND maybe a 22 cent mod is in your future. From all my reading on here it sounds like you might have the KLR "Lean" condition.....and the 22 cent mod should clear all that up for you.
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Old 04-12-2012, 08:58 AM
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Join Date: Feb 2012
Location: Sheffield Lake, Ohio
Posts: 96

My 09 does it too. I have 6200 miles on it.
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Old 04-12-2012, 09:24 AM
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Join Date: Jul 2011
Location: Jackson, Michigan
Posts: 182
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My 09 started doing it at 6000 miles at which point I adjusted the valves and did the .22 mod. The problem went away but I don't know which repair fixed it. I now have just over 20,000 miles on the bike and no complaints!

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