L mod Airbox mod - 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 40 Old 08-04-2009, 10:44 PM Thread Starter
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L mod Airbox mod

Tomorrow i am installing a Vance Hines muffler and dyno jet kit. My 2007 has no mods at all right now. Should I do an airbox mod prior to these upgrades? The airbox on my sons KLR looks like swiss cheese it has so many holes in it and it runs much better than mine. Should I do an L mod or just cut holes? How do you do and L mod. I know you cut an L shape in the box but I don't know how big or where exactly.
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post #2 of 40 Old 08-04-2009, 11:23 PM
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Don't do the L-mod until you have a larger main jet to install or you will have a major lean condition. You can do the mod how ever you like, drill cut, just make sure you don't cut into the filtered side of the airbox.
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post #3 of 40 Old 08-05-2009, 12:53 AM Thread Starter
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Thanks for the info. Should I do a stage one or two jet? I presume the both have larger main jets. They are rejetting it tomorrow at the kawasaki dealership
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post #4 of 40 Old 08-05-2009, 02:37 PM
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Dwell -

What SLO-KLR said. +1.

I'm a believer in not doing irreversible mods, so I recommend poking 1" holes that you can pop plastic plugs into if you don't like the results, or if you put a really loud muffler on and find that later on you want the stocker back on and have to rebalance the airflow. Ask me how I know about that...

photo deleted


Notice how that forward hole is only half a hole? Be careful where you cut - I miscalculated and got half the hole on the carb side of the baffle and had to patch it. Oooops. Fortunately it is made of ABS, so making a patch and cementing it in was easy. The plugs for the holes are available in those bins/drawers of miscellaneous hardware at Home Depot, Lowes, ACE, etc..

Are you also going to pull the snorkel out? It's usually done with the L-Mod.

Tom

Last edited by Tom Schmitz; 04-19-2017 at 07:49 PM.
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post #5 of 40 Old 08-05-2009, 03:56 PM Thread Starter
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Good information. Thanks. What is the snorkel? I am relatively new to motorcycles. I used to ride as a teenager and took a 30 year hiatus to raise kids.
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post #6 of 40 Old 08-05-2009, 06:26 PM
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There is a baffle (snorkle) in the intake of the airbox. It is very restrictive.
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post #7 of 40 Old 08-05-2009, 10:20 PM Thread Starter
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Found the snorkel and removed it. The bike runs awesome. Thanks
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post #8 of 40 Old 03-29-2013, 11:01 AM
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Tom what's that right angle piece left of your +ve battery post?

Have you tried the "MC" mod yet (advancing exhaust Cam one tooth. It works great on my 09).
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post #9 of 40 Old 03-29-2013, 12:04 PM
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salty_monk,

That is the fitting where the hose from the canister of the vapor recovery system goes. When I removed all of that I capped it off by simply inserting a vacuum cap (backwards) into the fitting.

Removing the fitting would have been more difficult and irreversible.

Interestingly, if you were install the IMS 10 gallon tank you would need that fitting to be intact. The vent for the tank goes there.

I haven't done the MC mod yet. I will, but probably not until I do a valve clearance check.

T

Tom [email protected]

ďThe kid poured him another straight rye and I think he doctored it with water down behind the bar because when he came up with it he looked as guilty as if he'd kicked his grandmother.Ē -Philip Marlowe

ď'Why' and 'How' are words so important they cannot be too often used.Ē -Napoleon Bonaparte

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post #10 of 40 Old 03-29-2013, 02:09 PM
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Ahhh mine is a Chicago bike, explains why I don't have it.
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