What Is This? - Kawasaki KLR 650 Forum
1987 to 2007 Wrenching & Mods For maintaining, repair or modifications of Generation 1 KLR's. 2007 and earlier.

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post #1 of 25 Old 05-18-2016, 10:14 AM Thread Starter
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What Is This?

Left side behind the battery and under the frame kinda covers an opening. What is it??



Kinda covers this opening.


'01 KLR 650, '09 Suzuki DL650, '08 Suzuki Bandit 1250, '16 CRF1000L, '09 KLX 250s
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post #2 of 25 Old 05-18-2016, 10:21 AM
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A useless pce of plastic you don't need, toss it. It is to cover the snorkle opening.....people have opined that it is to stop large objects from somehow getting into the airbox though I can't see it having any real value (or need) doing that.

Dave
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post #3 of 25 Old 05-18-2016, 10:22 AM Thread Starter
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Is the snorkel supposed to be open like that?

'01 KLR 650, '09 Suzuki DL650, '08 Suzuki Bandit 1250, '16 CRF1000L, '09 KLX 250s
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post #4 of 25 Old 05-18-2016, 10:37 AM
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I have a 2016 Cali model. One of the hoses from the back of the evaporative canister runs forward, along that bracket and to the air box. The bracket is set up so that it angles the hose away from the left seat bolt. Didn't work; I had to zip tie the hose to those little round holes to keep the hose from interfering with seat removal.

I caught it in a photo when I was doing an air filter cleaning post for my blog.

KamoKLR: Air Filter Cleaning
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post #5 of 25 Old 05-18-2016, 10:52 AM
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Quote:
Originally Posted by frostbitevinnie View Post
Is the snorkel supposed to be open like that?
That bike has been "de-snorkled" Vinn.
JJ

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post #6 of 25 Old 05-18-2016, 11:06 AM
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Originally Posted by frostbitevinnie View Post
Is the snorkel supposed to be open like that?
Only if you want your bike to run better. Read;

A lot of missunderstanding with airbox issues.

First, the screen. Airflow gains are not linear. Removing the screen with an otherwise stock KLR airbox will only gain you 2 cfm. The engine won't know the differance. However, with a heavily modified airbox, the gain from removing the screen is 8 cfm. Depending on what else is done to the engine, you may make more power. I doubt that you'll feel it, but a dyno will show it. Butt-dyno's can detect very small low rpm changes, but don't detect higher rpm changes very well at all. You'll likely not detect it, but that does not mean it's not there.

Comparing screen removal to other models is wrong, particularly with the newer sportbikes. With them, the screen often serves another purpose as well. Air distribution in a 4 cyl sportbike can be a real problem, particularly with "ram air". Removing the screen on them can cause very real losses, depending on the model. That does NOT apply to the KLR.

Same thing with air filters. There is only about 2 cfm differance from the best filter (UNI), to the worst (K&N). With a modified airbox, that differance grows to 9 cfm.

Here is the flow chart:

Completely stock - 64.8cfm
Same - Remove snorkle - 74cfm
Same - With UNI filter - 76.2cfm
Same - Remove screen - 78.6cfm
Same - Small "L" cut - 85.1cfm
Same - Large "L" cut, open snorkle area further - 92.4
Same - Remove door - 103.2

Alternate - UNI filter, No snorkle, With screen, No door, No "L" cut - 95.4

All at 2" of water, tested at 1 1/2" and 3" and averaged to 2"

To answer the larger question, how much air can the KLR really use?
....................
A stock KLR about 70-80cfm. With a good pipe about 75-90cfm. A modified motor about 90-100cfm. Having a bit more capacity than you you need will not hurt anything. The effects are not linear though. Going from 65cfm to 75cfm you will likely notice, but going from 75 to 85 cfm you likely won't.

Part of the confusion might be due to the effects of the carb shimming. Since that mod is for a stock needle, the snorkle removal serves not just to add air, but to lean out the top end. The stock KLR till 07 is rich on the top. ( The 08 has a smaller main jet.) Airbox mods have much more effect on top end mixture, so, with the stock needle it also helps straighten out the fuel curve.

Finally the airbox door. You've got to carefull there. You don't have clean air there. It's flowing past that door when riding. You can easily create a partial low pressure area there, depending on wind direction, and where you place your leg!

Cary




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Dave
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post #7 of 25 Old 05-18-2016, 12:16 PM Thread Starter
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Is there supposed to be some kind of screen no prevent crud and debris from going in the opening? Or to keep critters out?

Looks like it is wide open here.

'01 KLR 650, '09 Suzuki DL650, '08 Suzuki Bandit 1250, '16 CRF1000L, '09 KLX 250s
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post #8 of 25 Old 05-18-2016, 12:41 PM
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Originally Posted by frostbitevinnie View Post
... Or to keep critters out?...
"That's probably the best guess as to it's purpose that I have ever seen", Tom said in a mousy voice.

Tom
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post #9 of 25 Old 05-18-2016, 01:09 PM
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"That's probably the best guess as to it's purpose that I have ever seen", Tom said in a mousy voice.

Tom
....groan.....


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post #10 of 25 Old 05-18-2016, 01:10 PM Thread Starter
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So there is a screen?

'01 KLR 650, '09 Suzuki DL650, '08 Suzuki Bandit 1250, '16 CRF1000L, '09 KLX 250s
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