Another Aftermarket Pipe Question... - Kawasaki KLR 650 Forum
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post #1 of 16 Old 05-02-2012, 12:46 PM Thread Starter
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Another Aftermarket Pipe Question...

I have a FMF Q Series slip on that I would like to use. Although I'm pretty much a newb, I have done some research and know there will likely not be any performance gains. I do, however, like the sound and the look.

I would like to run the pipe without any other modifications. My question is can I run the pipe without any carb work? Will this cause a too-lean air/fuel ratio? The bike is completely stock, and for what its worth, I am running mostly at altitudes of 600'-1000'. Most of my riding is on the freeway.

James
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post #2 of 16 Old 05-02-2012, 07:27 PM
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From the factory the bikes run pretty lean so if it was me I'd do a stage1 jet kit


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post #3 of 16 Old 05-03-2012, 01:04 AM
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if you are going to change anything in the carb (ie 22 cent mod or jetting, turning out the idle mixture) then you may as well put in a UNI filer and mod the air box too (6 x 1" holes). you might be fine with just the exhaust, but if i was spending that money, i would go a step or two further.

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post #4 of 16 Old 05-03-2012, 04:43 AM
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A dyno run with air/fuel ratio graph would assure you of optimum jetting, and . . . provide a bragging-rights record of your horsepower.

Only way I know of to get the jetting right without guestimate and assumption involvement; the muffler manufacturer may be competent providing you specific advice without your "re-inventing the wheel" at your dynamometer-equipped speed shop.
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post #5 of 16 Old 05-03-2012, 09:13 AM
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Quote:
Originally Posted by jameslemoore View Post
I have a FMF Q Series slip on that I would like to use. Although I'm pretty much a newb, I have done some research and know there will likely not be any performance gains. I do, however, like the sound and the look.

I would like to run the pipe without any other modifications. My question is can I run the pipe without any carb work? Will this cause a too-lean air/fuel ratio? The bike is completely stock, and for what its worth, I am running mostly at altitudes of 600'-1000'. Most of my riding is on the freeway.

James
Hey James,
I see that you live realativly close to me. I'ld be happy to help you out installing the Q-4 and and justing the carb if you would like to bring it over.
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post #6 of 16 Old 05-03-2012, 10:02 AM
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James,
Here's some dyno test info for jetting & pipe mods.

http://www.pbase.com/image/110004615. The jd jetting site has lots of testing info and the owner is great about answering questions.

PPMC #4
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post #7 of 16 Old 05-03-2012, 12:13 PM
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Originally Posted by KLR-zin View Post
James,
Here's some dyno test info for jetting & pipe mods.

http://www.pbase.com/image/110004615. The jd jetting site has lots of testing info and the owner is great about answering questions.

I say his chart is BS. He plots HP to MPH? WTH? Never seen that it's always HP to RPM. Edit: I'm thinking he just labeled his chart wrong the MPH looks like a RPM curve but still his claims are way optomistic!

Patman spent a lot of time with repeated dyno runs, no way you will get the kind of HP gains that JD is claiming with a jet kit and pipe.

Patman Dyno Page

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

Last edited by Spec; 05-03-2012 at 01:37 PM.
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post #8 of 16 Old 05-05-2012, 02:14 PM Thread Starter
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Thanks for the replies.

SLO, thanks for the invite! I just may hit you up on that. With 800 miles it has started to snap-crackle at certain lower rpm's when off the throttle... so i think it may be excessively lean with the stock exhaust.

So, what should I do... try the $0.22 mod and check results or order a jet kit?
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post #9 of 16 Old 05-05-2012, 03:23 PM
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Quote:
Originally Posted by jameslemoore View Post
Thanks for the replies.

SLO, thanks for the invite! I just may hit you up on that. With 800 miles it has started to snap-crackle at certain lower rpm's when off the throttle... so i think it may be excessively lean with the stock exhaust.

So, what should I do... try the $0.22 mod and check results or order a jet kit?

The stock jetting is lean on the pilot and the needle but rich on the main. The .22 mod mostly corrects the lean condition. If you have to turn the air/fuel screw out more than about 2.5 turns you should change out the pilot. The washers raise the needle to fatten up the mid range. Changing out the needle gives it a different taper don't know if it's noticeable.

I did the .22 mod and was happy with the results, didn't see the need to get a jet kit.

Popping on decel can also be loose connections on the exhaust allowing air to get sucked back in. Check the header to cylinder and header to muffler bolts.

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 #10 of 16 Old 05-05-2012, 04:49 PM
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Quote:
Originally Posted by Spec View Post
I say his chart is BS. He plots HP to MPH? WTH? Never seen that it's always HP to RPM. Edit: I'm thinking he just labeled his chart wrong the MPH looks like a RPM curve but still his claims are way optomistic!

Patman spent a lot of time with repeated dyno runs, no way you will get the kind of HP gains that JD is claiming with a jet kit and pipe.

Patman Dyno Page
Here's the chart w/ rpm to hp ratio
http://www.pbase.com/jdjetting1/image/110004616
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