Spark Arrestor and riding without it. - 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 24 Old 07-12-2009, 08:19 PM Thread Starter
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Post Spark Arrestor and riding without it.

Ah forget it

Last edited by MetalBender; 01-06-2010 at 10:19 AM.
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post #2 of 24 Old 07-12-2009, 10:44 PM
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A spark arrestor is supposed to protect the environment. We just had a rather large forest fire which was believed to be caused by quaders with modified exhaust systems.

Hopefully the authorities have more important things to do then check for spark arrestors.

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"It's a friggen motorcycle, it's not supposed to be comfortable, quiet or safe. The wind noise is supposed to hurt your ears, the seat should be hard and riding it should make you shit your pants every now and then. "

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post #3 of 24 Old 07-13-2009, 02:02 AM
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Quote:
Originally Posted by MetalBender View Post
I completely understand why they are on the bikes, just wondering if it has ever been an issue for anyone. None of my bikes have had them left in place and I have not seen a spark come from an exhaust since the early '80's. On the other hand my head pipe will glow red and easily start a fire, so....
me me me me me me me oops a burnt forest me me me me me me

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post #4 of 24 Old 07-13-2009, 02:31 PM
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Originally Posted by MetalBender View Post
Ok, great. Thanks! Glad to see someone had the answer to the question I posed. How about some ideas as to how to stop the head pipe from glowing red there tomatocity. And just to be clear, I have never been to ANY forest with the bikes. Just asking if it would be an issue. Not off-road but on-road through the parks.
If the head pipe is glowing red hen you are way too lean and you need to richen the air fuel mixture. Lean can be caused by not enough back pressure or too much flow. Reinstall the spark arrestor and see if that helps.

Tim

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2015 Yamaha Super Tenere ES, 5/23/2015
2012 Yamaha Super Tenere; Purchased 7/30/2011; Sold 5/23/2015
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post #5 of 24 Old 11-08-2009, 10:48 AM
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Yeah if you modified the stock exhaust and removed the baffle, the spark arrester screen is farther inside than that.
FYI I have had my muffler checked for a spark arrester by a ranger before. I've also seen some significant flame come from other bikes that did not have an arrester.
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post #6 of 24 Old 11-08-2009, 11:54 AM
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"FYI I have had my muffler checked for a spark arrester by a ranger before."

What was the outcome?

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2012 Yamaha Super Tenere; Purchased 7/30/2011; Sold 5/23/2015
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post #7 of 24 Old 11-08-2009, 07:59 PM
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Originally Posted by MetalBender View Post
Turned the screw out 3 turns and can smell the unburnt fuel yet the head pipe still glows red at the bend in the front. Floods very easy too. I have also done the .22 mod and drilled the air box. Could it be living between 5-7k rpm causing this? And if so what other options have I got to keep the head pipe from glowing?
If it was lean enough to glow the head pipe before you made the changes:
Turning the screw out 3 turns will help off idle and on deceleration to stop the lean condition popping.
Not sure how much you raised the needle but that helps more on early throttle and not as much at WOT.
Drilling the airbox will only cause lean in all throttle positions.

If it was me I would...
...tape up the airbox and see if that helps.
...adjust the idlejet between 1.75-2.25 turns.
...make sure the head pipe was seated correctly and not leaking. If it leaks it usually is on the bottom and you should be able to see exhaust marks.
...if you are consistantly running between 5000-7000 RPMs you might need to increase the main jet. If so you might consider changing to a KLX (OEM) or Dynojet (aftermarket) needle and jet.

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post #8 of 24 Old 11-08-2009, 09:22 PM
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MetalBender

Is your bike a +08? Reason I ask is the headers are different than the older models. If so, '08 in stock trim glowed the pipe red. No change after the 22 cent mod either. On other KLR forums this is considered normal. Not saying it's right, just is.

Gray-haired riders donít get that way from pure luck.

Unknown
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post #9 of 24 Old 11-08-2009, 09:29 PM
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'08s also have an air pump which can cause more of a lean condition.

Make sure every exhaust connection is tight.

Tim

2005 KLR 685
2015 Yamaha Super Tenere ES, 5/23/2015
2012 Yamaha Super Tenere; Purchased 7/30/2011; Sold 5/23/2015
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post #10 of 24 Old 11-08-2009, 10:02 PM
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Quote:
Originally Posted by tomatocity View Post
'08s also have an air pump which can cause more of a lean condition.

Make sure every exhaust connection is tight.
Right, fresh air is introduced into the exhaust to reduce NOX emissions. Most single wall headers will glow in low light conditions even if the AFR is correct.
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