I need some clarification if possible! - 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.

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post #1 of 15 Old 07-02-2016, 08:09 PM Thread Starter
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I need some clarification if possible!

Ive been doing a lot of reading on the deceleration after doing 22 cent mod or on the klr650 in general. Ive adjusted the needle to the best possible spot on my bike. great acceleration and running temps. Its taken a while but Im there. My question is. Is there a difference between deceleration popping and backfire? I get no backfire but usually at lower rpms when down shifting i get a bit of popping sound. My old bike did it all the time and I never cared,but I guess I kinda Got caught up in the subject being its a new klr!
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post #2 of 15 Old 07-03-2016, 07:43 AM
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........ Is there a difference between deceleration popping and backfire? .......
A "popping" sound wakes up the dog where as a "backfire" wakes up the neighborhood.

Are you just taking about a normal deceleration "pop" or is it more of a Harley type explosion where somebody calls the cops reporting gunshots?

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post #3 of 15 Old 07-03-2016, 01:04 PM Thread Starter
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Its just a low popping sound like a rumble. No loud bang.
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post #4 of 15 Old 07-03-2016, 01:14 PM
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Its just a low popping sound like a rumble. No loud bang.
My new 2016 does that with no carb mods.
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post #5 of 15 Old 07-04-2016, 07:23 AM
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Can be pretty normal. The new ducati bikes decel pop out of the box and they are efi.

'01 KLR 650, '09 Suzuki DL650, '08 Suzuki Bandit 1250, '16 CRF1000L, '09 KLX 250s
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post #6 of 15 Old 07-04-2016, 07:35 AM
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Its just a low popping sound like a rumble. No loud bang.
A pop sounds normal. A loud bang is not normal. Sounds like you just own a KLR.
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post #7 of 15 Old 07-04-2016, 08:38 AM
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The newer bikes have an air injection system which injects air into the exhaust to burn any unburned hydrocarbons thus reducing hydrocarbon emissions. That is what you are hearing on deceleration if your AIS hasn't been messed with. It is a normal sound. My AIS has been deleted and I get no decel popping.
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post #8 of 15 Old 07-04-2016, 12:37 PM Thread Starter
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Please correct me if Im wrong. I thought I read somewhere if you remove that system you will have a strong scent of fuel. Also by removing that do you gain anything or just lose some weight off the bike as well as the popping sound?
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post #9 of 15 Old 07-04-2016, 11:10 PM
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Not all that serious,

The AIS needs to be capped/ plugged off so it's not a source of fresh air getting in.
An exhaust gasket at either end of the headpipe'll cause a pop too.
It's not serious, but if it's happening all the time the exhaust or AIS is letting in
some 02 that pops when it hits the hot exhaust gasses. The other is a lean condition
when the throttle closes during non braking decel. At which time the carb is on the
idle circuit and jetting isn't the issue, but a lean idle mixture. Go out two turns for
a baseline start. I'm out 1 2/3 turns. Others get the smoothness around 2 2-1/4 turns
from gently seated.
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post #10 of 15 Old 07-05-2016, 03:05 PM Thread Starter
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I did 22 cent mod and Im about 2 turns out. I will have to check exhaust. Well.... I checked exhaust and the 2 manifold bolts were loose! LOL have to go ride to see if that made any difference,

Last edited by not2serious; 07-05-2016 at 04:53 PM.
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