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Old 05-05-2014, 05:01 PM   #1
travis25 OP
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New bike backfires?

I have 425 miles on my new bike and when i accelerate and pull in the clutch to shift it backfires and sometimes when i decelerate as well???
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Old 05-05-2014, 05:16 PM   #2
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check to see if exhaust pipe is loose at the head.

what bike?
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Old 05-05-2014, 05:24 PM   #3
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My question as well , what brand and model of bike ?.
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Old 05-05-2014, 05:44 PM   #4
travis25 OP
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2014 klr 650
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Old 05-05-2014, 06:44 PM   #5
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Did you put an after market exhaust on it??
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Old 05-05-2014, 06:49 PM   #6
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Is it Stock

If it's stock, I'd go to the dealer.
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Old 05-05-2014, 07:20 PM   #7
travis25 OP
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Did you put an after market exhaust on it??

Not yet
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Old 05-05-2014, 08:34 PM   #8
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Lots of things can cause a backfire exhaust leak Vacuum leak carb jetted to lean or semi clogged slow jet (& I am sure more that I dont know about)
That said if you bike is brand new take it back and have them look at it.
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Old 05-05-2014, 09:38 PM   #9
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take it back just in case, but don't be surprised if they say "they all do that".... because it's possibly true. klr's are jetted pretty lean from the factory. also the idle mixture screw is adjusted at the factory to the leanest point where it will still run and then they plug the access. there is a klr modification called the 22 cent mod. there are 3 parts.... drill out the plug & re-set the mixture, shim the main needle with little washers, and drill the slide. do the first 2, forget drilling the slide.
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Old 05-06-2014, 05:35 AM   #10
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take it back just in case, but don't be surprised if they say "they all do that".... because it's possibly true. klr's are jetted pretty lean from the factory. also the idle mixture screw is adjusted at the factory to the leanest point where it will still run and then they plug the access. there is a klr modification called the 22 cent mod. there are 3 parts.... drill out the plug & re-set the mixture, shim the main needle with little washers, and drill the slide. do the first 2, forget drilling the slide.
+1
All new KLRS backfire when running against the motor. Not an issue- more an irritant .

The 22 cent mod is technically 'illegal' as one has to remove a plug and adjust the slow running circuit in the carb and that is agaisnt the EPA regs. We all do it.

I personally would advise the drilling and needle process. I went that route and all it did was use more gas. I returned the carb to stock (except the idle screw) about 55k miles ago and am very happy with the bikes performance.

It could also be a loose header - check the 2 bolts there.
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Old 05-07-2014, 07:14 AM   #11
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Quote:
Originally Posted by travis25 View Post
I have 425 miles on my new bike and when i accelerate and pull in the clutch to shift it backfires and sometimes when i decelerate as well???
New bike - dealer and Kawasaki's problem.

Of course you don't really mean backfire, because that is when the engine pops back through the carb. You mean it is popping out the exhaust, right?

Often caused by lean condition due to meeting the EPA requirements.
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Old 05-07-2014, 09:36 AM   #12
travis25 OP
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New bike - dealer and Kawasaki's problem.

Of course you don't really mean backfire, because that is when the engine pops back through the carb. You mean it is popping out the exhaust, right?

Often caused by lean condition due to meeting the EPA requirements.

Correct its not a loud backfire its a soft pop out of the exhaust.
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Old 05-07-2014, 10:08 AM   #13
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Quote:
Originally Posted by travis25 View Post
Correct its not a loud backfire its a soft pop out of the exhaust.
I'm betting on lean jetting due to EPA... Kaw has been milking that engine for a couple decades, so it has to be lean as heck.

Still, I'd get with a dealer just because it is new, to make sure nothing else is wrong. Then if all is still "normal", find out how the riders are jetting the KLRs to run better.
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