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Old 02-01-2012, 03:35 PM   #1
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Cool my exuast is glowing cherry red on my 05 brute 750

i was riding today for 30-45mins and i stopped to gas up and i noticed after riding mostly WOT for 30ish mins my exhaust was glowing cherry red. so i turned it off and gave it a 15min cool down and parked it for the night. ive noticed my 05 brute 750 has been running kinda rich recently and i know i need my carb's tuned right but now im wondering is there damage since its been like this for the past 150 miles ive done this winter. any help much appreciated.
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2005 brute force 750 28" mudlites, itp delta, Dynatek CDI, hmf exhaust W/ quiet core, jet kit, K&N w/outer wear, epi maroon primary-almond secondary, full skids.

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Old 02-01-2012, 04:22 PM   #2
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Id like to say there isn't any damage as its still running and not knocking or acting up. I say fix the problem now without riding it anymore and you'll be okay. (99% sure). But fix it now and dont ride it anymore!
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Old 02-01-2012, 04:29 PM   #3
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if it's glowing red after wot ,its not rich its way lean ... up your mains. I would jump two sizes to start... so if 150/155 goto 160/165 ect...
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Old 02-01-2012, 04:40 PM   #4
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You could definitely be lean but I would venture to say that after 30 minutes of wide open throttle, your exhaust may be glowing regardless of jetting. What if any mods do you have done to it?
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Old 02-01-2012, 06:31 PM   #5
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I went from 142F and 145R

to 148F and R

then 1 #4 washer under each needle

clipped springs 1/2"

and dialed air screws out 2.5 turns each.

works great... VFJ and other good guys on here gave me that remody...
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2009 Kawasaki Brute Force 750 I.S.
WARN 2500
UNI FILTER
HEATED GRIPS
FULL SKID PLATES
MSD - From VFJ
FULL MUZZY DUALS - From VFJ
My old 05 Brute 650 SRA...
2" lift, Jetted, Muzzy Pro, Temp Gauge, K&N, Dynatek CDI
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Old 02-01-2012, 08:11 PM   #6
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Looking at the mods in your signature you do not mention Snorkels. Since you changed the exhaust, CDI, and apparently jets you changed the air/fuel mixture and I would say your running rich. Only you can answer the question....Does it smell rich? If so your exhaust will glow. How do I know? Because I also have the same problem and on the other site I'm advised to go with a 3" snorkel instead of the 2" intake snorkel. My exhaust is stock but punched out so yes the flow has been changed on both sides of the engine. I have a kit to change jets but I will modify the snorkel first.
Now according to the other guys I ask they want to know....does it backfire / pop out the exhaust or spit back through the carbs?
Backfire = Rich. (Unburned fuel accumilating in the exhaust and ignites causing Backfire)
Spit and sputter = Lean (Not enough fuel which will ruin an engine quick)
Mine is rich since it never spits back through the carbs, and I also can tell with the rich smell of the exhaust and black smoke after I let off high throttle revs. Not to mention the flame you can see at night blowing out the exhaust tip.
Rich only waste's fuel and causes high heat around the exhaust so running rich is not as big an issue as running lean. My 06 750, bought used from the neighbor, has been running rich since 07 and still going with no engine issue's at all.
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Old 02-01-2012, 08:29 PM   #7
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99% of the time exsaust backfiring is lean not rich....1% of the time its a exsaust leak ...

most of the time it will backfire when you drop throttle and are coasting. Thats not a main jet issue its a idle air fuel issue. twist open the air/fuel screws some on the bottom of the carbs...

Pipes dont glow from being rich. titainium pipes are differant. steel pipes 99% of the time wont glow when jetted correctly. ya might get a little glow at night. but not bright red glow....

If you want to be sure on the mains go wot for a good distance and kill it right away and pull a plug ... white is lean, tan is perfect, black is rich ...
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Old 02-01-2012, 08:50 PM   #8
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Black is rich! CHECK..got that too.
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Old 02-01-2012, 08:55 PM   #9
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just to be clear , be aware you can be lean on idle and get backfiring on decell and still be rich on your mains.. you need to test all three zones....
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Old 02-02-2012, 12:46 PM   #10
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the previous owner had it jetted but i think they screwed up cause in netural if i rev it up flames comes out the exhaust and my exhasut is really black inside. i know my front header is loose previous owner installed a full HMF exhaust. so im just hoping i didnt do motor damage.
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2006 brute force 750-27" mud zillas,itp delta 5" offset,Dynatek CDI,epi clutch kit= 54+56g weights-white primary-red secondary spring,full body skids,HD bumper, warn rt2500 winch.

2005 brute force 750 28" mudlites, itp delta, Dynatek CDI, hmf exhaust W/ quiet core, jet kit, K&N w/outer wear, epi maroon primary-almond secondary, full skids.

if you can read this thank a teacher if its English thank a soldier.
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