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Old 06-04-2012, 03:53 AM   #141
skyrider
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Thumbs up Re: Is your KLR Backfiring...???

Have been noticing a few pops lately and sure enough my bike had loose header nuts.

easy to get at them too with a long extension.
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Old 07-30-2012, 01:20 AM   #142
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Default Re: Is your KLR Backfiring...???

This thread saved me a ton of time and an end to my weekend ride frustration...

Having just installed a Dynojet Stage 1 and air snorkel removal, my bike started backfiring alot a few hundred clicks later. , but with a different type of 'pop'. First instinct was the carb setup... 142 DJ main, slide drilled 7/64, 2 turns out on the idle mixture, e clip 2nd groove from the top. Usual setup though.

It ran very well for the first full tank. Big difference. Within 2 minutes of the 2nd fill it started popping.

Swallowed my pride and did a little R&R before I pulled the carb and checked the plug.
Sure as heck I was missing the header bolt and the other was maybe 7 lbs tight.
Bad coincidence I guess.

Thanks Wyman!
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Old 10-27-2012, 10:06 PM   #143
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Default Re: Is your KLR Backfiring...???

Thanks Wyman for starting this thread. My '08 has been backfiring for years, and I thought it was the nature of the beast. I came across the forums and this thread a few days ago. I checked my bike, and one of the nuts was missing! I bought a replacement from the dealer today. It's amazing how much better the bike sounds and runs. I went for a 1/2 hour ride this evening and then snugged up both nuts using my torque wrench. Thanks again
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Old 10-28-2012, 09:42 AM   #144
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Default Re: Is your KLR Backfiring...???

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Originally Posted by cyclejohn View Post
Thanks Wyman for starting this thread. My '08 has been backfiring for years, and I thought it was the nature of the beast. I came across the forums and this thread a few days ago. I checked my bike, and one of the nuts was missing! I bought a replacement from the dealer today. It's amazing how much better the bike sounds and runs. I went for a 1/2 hour ride this evening and then snugged up both nuts using my torque wrench. Thanks again
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Old 10-28-2012, 09:47 AM   #145
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Wyman, it is good to see you have your cape on this morning.
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Old 10-28-2012, 09:49 AM   #146
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Wyman, it is good to see you have your cape on this morning.
Sheeeet.....just spit my coffee all over the keyboard....LOL

how ya doin Glenn....????

wy
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Old 10-28-2012, 11:52 AM   #147
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Good, off to church.
How are you doing this morning?
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Old 11-03-2012, 03:53 AM   #148
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Default Re: Is your KLR Backfiring...???

My bike has begun back fireing alot.
It does not do it at idle, when I rev the engine, or on deceleration.
It only back fires under load. I can not start out from a stop without a couple of pops.
If getting on the freeway it popps in 1st, 2nd, and third.
I have both of my nuts but have not confirmed how tight they are yet.
When I moved the muffler the engine moved with it in sync but there appears to be a slight gap.
I am geussing that the header should be flush with the head?
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Old 11-30-2012, 08:34 PM   #149
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Default Re: Is your KLR Backfiring...???

first thing i noticed in my noobness today

Note to self: check yo nutz soon
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Old 05-15-2014, 10:14 PM   #150
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Default Re: Is your KLR Backfiring...???

Lost both of my nuts todayhttps://www.klr650.net/forums/images/smilies/uhoh.gif
noticed backfire's after a downshift on 540. I was a sad panda... well until I got home and fixed the problem.
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Old 05-16-2014, 09:39 AM   #151
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Default Re: Is your KLR Backfiring...???

I've got tight nuts, but still experience the occasional backfire. I have an aftermarket pipe. Could the connection of the after market pipe to the stock header be causing this if not tight? I had to replace this part:
11009:
GASKET,EXHAUST PIPE C

as it was definitely leaking there. Still backfires a bit
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Old 02-08-2015, 04:26 PM   #152
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Default Re: Is your KLR Backfiring...???

I have 2009 klr650<that is backfiring . I read your message, checked my bike, one nut is missing.I wonder now< if I need to replace the gasket, or just put a nut on it and go for it. would not replacing gasket, possibly cause damage ?
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Old 02-08-2015, 05:34 PM   #153
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Default Re: Is your KLR Backfiring...???

just use some high temp locktight and replace the nut for starters.
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Old 08-12-2015, 06:37 PM   #154
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Default Re: Is your KLR Backfiring...???

Yes the Acorn Nuts are tight, but I have movement on the manifold junction. The crush gasket has disintegrated. Also the Way my new Yoshumura Pipe fits into the exhaust pipe, seemed to be missing a clamp. If the Exhaust pipe is moving at the engine, by one pipe being slid into another downstream, without a clamp...I think this may lead to destroying the gasket. Anytime you pull the pipe out of the head, you should probably change that gasket, and mine is taking 2 weeks to order, so think ahead if you're doing pipe mods. I put the Yoshamura pipe on because the original exhaust developed a hole that I was unable to patch with a wide variety of liquid metal products. It did sound better for a couple of months, but I'm thinking sliding one pipe in another is a bad idea as vibration induces movement down on the head end.
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Old 08-13-2015, 05:09 PM   #155
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Default Re: Is your KLR Backfiring...???

Quote:
Originally Posted by skypilot7 View Post
mine is taking 2 weeks to order
Two weeks to get the exhaust gasket?
Man, order from Eagle Mike today and you'll prolly get it Saturday!
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Old 08-19-2015, 05:35 AM   #156
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Default Re: Is your KLR Backfiring...???

Thanks for this thread...my nuts were indeed loose at 300 miles. It makes sense really. The proper procedure seems to involved torqueing them, then re-torqueing them after a heating and cooling cycle. As the head expands and contracts, the nuts will loosen. If you pay it no mind, they will eventually fall off.
It's never a good thing when your nuts fall off, seems my Mom warned me about that years ago

I've only just begun to read this site and have learned much...thanks all.
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Old 09-02-2015, 01:10 PM   #157
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Default Re: Is your KLR Backfiring...???

Mine is fixed. It was all about the gasket as far as backfire. And putting a 1 1/4 inch hose clamp on the other end of the pipe, that the Yosh kit did not supply. There should be no movement on the pipe, front or rear.
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