Aftermarket Exhaust - Kawasaki KLR 650 Forum
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post #1 of 22 Old 07-12-2008, 07:46 AM Thread Starter
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Exclamation Aftermarket Exhaust

Hi Guys,

If I change my factory fitted exhaust for an after market one, will I need to re-jet the carb for better performance?

Here is South Africa the after market exhausts come from a company called Air Age. Anyone heard or know about these exhausts?

Do after market exhausts make that much difference to the performance or fuel consumption?

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post #2 of 22 Old 07-12-2008, 08:20 AM
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If you're going to change the exhaust for some power gain, then you should change the main needle, adjust the pilot air scew out to 2 turns and open up the air box. The whole point of an exhaust change is to allow the engine to breathe better. If you don't open up the front end (airbox) then the advantages aren't seen out the back end. As to the fuel economy I haven't seen and real change. My average has been the same with the mods I did. I have the Jardine pipe, Studabaker main needle, holes drilled in the air box, and I run the stock air filter. (it flows better than the K&N). The change in the bike was astounding. In fact when I had the bike at the dealer for some warranty work they asked me what I had done to the engine. They had never been on a KLR that would pull the front wheel off the ground with just some throttle, you should have seen the big eyes when I told the mechanic that I had a 16 tooth counter sprocket on it also. So yes, these mods make a huge differance to the machine.
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post #3 of 22 Old 07-12-2008, 03:57 PM
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Hehehehehe...my local Kaw dealer was the same way. I let him ride it and he just couldn't believe the difference in the bike.. They are now doing exhaust mods for KLR customers at the shop.
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post #4 of 22 Old 07-18-2008, 02:46 AM Thread Starter
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Done the exhaust change to the AirAge after market pipe, haven't done the main needle jet or air screw, but can definitely feel a difference in the low down torque in the bike. Will see to do the rest soon to even better the performance. Will let you guys know about the consumption figures after i have driven a couple of 100 km.
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post #5 of 22 Old 07-18-2008, 08:15 AM
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I think you will really enjoy the bike much more when that stuff is done.
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post #6 of 22 Old 07-18-2008, 09:24 AM
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Congrats Toto, opening up the exhuast really helps the bike a lot. The jetting isn't so much to better the performance altho it does, but is to keep the bike from running too lean and possibly harming the motor. If it is running too lean you run the risk of burning up the rings and or piston.
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post #7 of 22 Old 07-18-2008, 11:03 AM
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I had an '05 w/similar mods. I presume the '08 is the roughly the same economy after the mods, IF you ride tha same. The mileage on most of my bikes hasn't changed significantly w/minor mods, provided the throttle input stays about the same.
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post #8 of 22 Old 09-10-2008, 08:47 PM
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question

I also have stock filter with holes in air box and jardine slip on, but have factory needle and main drilled 2mm over stock. Question is would studabaker main be more effective and the 16 tooth counter you are talking about a front sprocket,pardon the stupidity.
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post #9 of 22 Old 09-10-2008, 08:56 PM
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Yes the studebaker needle with the e-clip on the middle notch. 16 tooth counter sprocket is indeed the front "small" sprocket. The studebaker needle will be an improvement. You are probably running more lean than you should be.
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post #10 of 22 Old 09-27-2008, 04:56 PM
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main jet help

Quote:
Originally Posted by Les View Post
If you're going to change the exhaust for some power gain, then you should change the main needle, adjust the pilot air scew out to 2 turns and open up the air box. The whole point of an exhaust change is to allow the engine to breathe better. If you don't open up the front end (airbox) then the advantages aren't seen out the back end. As to the fuel economy I haven't seen and real change. My average has been the same with the mods I did. I have the Jardine pipe, Studabaker main needle, holes drilled in the air box, and I run the stock air filter. (it flows better than the K&N). The change in the bike was astounding. In fact when I had the bike at the dealer for some warranty work they asked me what I had done to the engine. They had never been on a KLR that would pull the front wheel off the ground with just some throttle, you should have seen the big eyes when I told the mechanic that I had a 16 tooth counter sprocket on it also. So yes, these mods make a huge differance to the machine.

what size main jet did you use? What size main jet is stock. Does a smaller number indicate a small opening in the main jet... I just got the jardine exhaust with jet kit and k&N filter. Also i have question about the jet install. was no problem installing the needel i set to 3rd natch. and directions said to drill the hole in the top left side bigger... i opted not to b/c i know once you remove metal its tricky to put back and i know nothing about this hole it wants me to enlarge. Help...

Last edited by JWP6114; 09-27-2008 at 04:59 PM. Reason: im stupid and unthurough
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