L Mod created hesitation ?? - 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 11 Old 05-28-2012, 09:49 PM Thread Starter
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L Mod created hesitation ??

So I did the .22 cent mod a while back and it worked great! I just did the L Mod a few days ago and now I have alot of hesitation at low RPMs. As soon as it get around 3500 it's good but if you left the clutch out and givver at low RPMs it sorta bucks a bit then starts to haul. I also have a new end cap in the mail to do the exhaust mod, will that make a difference with all the new found air? I'm doing a 1500km ride on June first through the Canadian Rockies and want to make sure it's nothing major wrong before I go. Or should I tape up the L mod ??



'Life's Journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways,totally worn out, shouting, 'Holy shit .... What a Ride!
Cheers, Nick
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post #2 of 11 Old 05-29-2012, 09:29 AM
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My 2 cents. The L airbox mod is only good if you have done other mods (klx needle, pipe..) It is just too much air for a stock KLR (even with 22 mod).
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post #3 of 11 Old 05-29-2012, 10:49 AM
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Originally Posted by KLR Thumper View Post
So I did the .22 cent mod a while back and it worked great! I just did the L Mod a few days ago and now I have alot of hesitation at low RPMs. As soon as it get around 3500 it's good but if you left the clutch out and givver at low RPMs it sorta bucks a bit then starts to haul. I also have a new end cap in the mail to do the exhaust mod, will that make a difference with all the new found air? I'm doing a 1500km ride on June first through the Canadian Rockies and want to make sure it's nothing major wrong before I go. Or should I tape up the L mod ??



'Life's Journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways,totally worn out, shouting, 'Holy shit .... What a Ride!
Cheers, Nick

Have you tried adjusting the air screw? More air coming in = leaner. Try adjusting while the bike is running and see if you can dial out the off idle bog.

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #4 of 11 Old 05-29-2012, 05:50 PM Thread Starter
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Hmmm. I have not tried that yet, you mean the screw ya back out for the .22 cent mod? That would be hard without twistin the carb



'Life's Journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways,totally worn out, shouting, 'Holy shit .... What a Ride!
Cheers, Nick
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post #5 of 11 Old 05-29-2012, 06:50 PM
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Talking Doing it without twisting the carb

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Hmmm. I have not tried that yet, you mean the screw ya back out for the .22 cent mod? That would be hard without twistin the carb
Cheers, Nick
There is a way to do it without twisting the carb. I used a Dremel to remove the air screw plug material and then used a bent tool to turn the air needle.
Just be careful and don't "screw the pup"!
"your results may vary"!
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post #6 of 11 Old 05-29-2012, 06:50 PM
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Hmmm. I have not tried that yet, you mean the screw ya back out for the .22 cent mod? That would be hard without twistin the carb



'Life's Journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways,totally worn out, shouting, 'Holy shit .... What a Ride!
Cheers, Nick

There are extended fuel screws like these:





I remember seeing someone making a tool like a right angle screwdriver to adjust the screw. It's easier to adjust it for throttle response while it's running short of that turn the carb and adjust 1/2 turn and try it.

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #7 of 11 Old 05-29-2012, 07:22 PM
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No hijack intended, but . . . thinking about the "L mod," doesn't this mod defeat the purpose of the crankcase vent to the air box, at least under some rpm conditions?

I mean, what's the difference between venting the crankcase to the atmosphere and venting it to an open air box?

What am I missing here?

EDIT: Clarified by Spec in Post # 8 below.

===========

Oh, yes; Spec. Some call an idle mixture adjustment screw on the engine side of the carburetor a "fuel screw" (no matter what Kawasaki's parts list calls it), and one on the air intake side, an "air screw." Machts nichts with a CVK40 carburetor, the screw-in-question meters an air/fuel mixture into the venturi, if I'm not mistaken.

Last edited by LoneRider; 05-30-2012 at 04:17 AM.
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post #8 of 11 Old 05-29-2012, 08:23 PM
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Originally Posted by LoneRider View Post
No hijack intended, but . . . thinking about the "L mod," doesn't this mod defeat the purpose of the crankcase vent to the air box, at least under some rpm conditions?

I mean, what's the difference between venting the crankcase to the atmosphere and venting it to an open air box?

What am I missing here?

===========

Oh, yes; Spec. Some call an idle mixture adjustment screw on the engine side of the carburetor a "fuel screw" (no matter what Kawasaki's parts list calls it), and one on the air intake side, an "air screw." Machts nichts with a CVK40 carburetor, the screw-in-question meters an air/fuel mixture into the venturi, if I'm not mistaken.


The crankcase vents enters between the air filter and the carb. It doesn't go into the airbox. Emmisions won't allow venting to atmosphere. The airbox is vented stock, the L mod just opens it up more.

Yea it's a fuel screw when it's on the cylinder side and an air screw on the air intake side. So yea it would be an air screw on the KLR. Same difference adjusts the pilot circuit mixture.

No eye has seen, no ear has heard, no mind has conceived what God has prepared for those who love him. 1 Cor 2:9
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post #9 of 11 Old 05-29-2012, 10:35 PM
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The crankcase vents enters between the air filter and the carb. It doesn't go into the airbox. Emmisions won't allow venting to atmosphere. The airbox is vented stock, the L mod just opens it up more.
Thanks for the clarification, Spec!
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post #10 of 11 Old 05-30-2012, 10:48 PM Thread Starter
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Well I took the easy way out and put my new UNI filter in and covered over the L mod air holes and the bike works perfect again so I think to keep it simple I will just leave er alone. After I do the exhaust mod maybe I'll open er up then. My old [email protected] filter only had 500 street km on it so I doubt it was a dirty filter making it run pour. But eitherway. It's runs good again!



'Life's Journey is not to arrive at the grave safely in a well preserved body, but rather to skid in sideways,totally worn out, shouting, 'Holy shit .... What a Ride!
Cheers, Nick
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