L mod Airbox mod - Page 3 - 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 #21 of 40 Old 03-29-2013, 07:42 PM
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Plus you only need 4 holes not 5. If you see, he drilled across the separating barrier between the filter and the screen, a bad thing.

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post #22 of 40 Old 03-29-2013, 07:44 PM
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Damn it willys, anybody can see there's not 5 holes there!

Sheesh, man, open your eyes!

There's only 4 1/2 holes.

T

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post #23 of 40 Old 03-29-2013, 10:30 PM
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Calculated flow area of 40mm is 1.948sq in (carb bore diameter)
Calculated flow area of 4 -1" holes is 3.14sq in So 4 1/2 holes are not really needed.
Plus the airflow through the snorkle area
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post #24 of 40 Old 03-29-2013, 10:38 PM
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I'm going to try and calculate what the open area of the backfire screen is. I have to get the air box out of the frame.

I don't know how to calculate the open area of the filter unless there is a known percentage for the type of foam used.

The Mikes noted an increase in power during their dyno runs when the door was off. That's a big hole.

I think the general idea is that you want any restrictions in the intake side to get progressively smaller as opposed to going from small to big to small again.

T

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post #25 of 40 Old 03-29-2013, 10:39 PM
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Ah [forehead smack] now I see why it's the "L" mod.
Yes, 4 holes seems like plenty of airflow, like I said - compared to the opening of the carburetor - and this isn't even where the air is supposed to come in the box.

There seems to be a little disagreement whether removing the snorkel is a good thing or a bad thing on the gen 2 bikes, maybe I could do that in a way that's reversable if need be.
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post #26 of 40 Old 03-29-2013, 10:41 PM
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Oh, it's easily reversed. The snorkel is not damaged when you remove it.

T

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post #27 of 40 Old 03-29-2013, 10:42 PM
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The size of the screen is larger than the opening of the filter but you must take into account the amount the surface area is blocked off by the screening. I took my screen out, it was a bitch of a job! I have removed another which almost fell out with a gentle push. Most are epoxied in extremely well and the screen isn't easily cut.

I think if you were going to go with the door off you may as well redisgn the airbox and use the pod filters and rejet accordingly.

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post #28 of 40 Old 03-29-2013, 10:46 PM
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Quote:
Originally Posted by justjeff View Post
...So 4 1/2 holes are not really needed...
Truth be told, I drilled the half a hole first. After a short session of self flagellation, I returned to the scene and fixed it.

Then I drilled the second hole and checked the AFR, drilled the third and checked the AFR, then the fourth and fifth. The AFR did not change with the fifth hole.

I'm glad I have the half a hole, though, because nothing is Beatle-proof.
a virtual beer and cigar to the first to explain the reference.

T

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post #29 of 40 Old 03-30-2013, 07:00 AM
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http://www.klrforum.com/showpost.php...80&postcount=4

Wish I had done a bit of research first before doing mine last December. Mine looked exactly the same. However, I drilled my fifth hole last.

Beatle-proof?.... a reference to the so called "fifth beatle" Pete Best?

Gray-haired riders don’t get that way from pure luck.

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post #30 of 40 Old 03-30-2013, 07:36 AM
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My JD Jetting kit came with instructions to cut a certain size opening in the intake horn.

The mighty 650 is definitely louder on the intake side ... in a nice way...
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