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Old 06-28-2008, 07:24 PM   #1
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Need help! I have an 05 Brute 750. Less than 500 miles. Bone stock. Unit had set up for a while. Siphoned as much gas as I could and filled with premium+Lucas. Changed plugs, fluids, etc. Unit back-fired through air box and exhaust. I did the front needle replacement to NFKL and it still back-fires through air box and exhaust. Checked all clamps on intake and bolts on exhaust. All good. I'm not very good at carb adjustments so any help anyone can be would be appreciated. Run valves? Change carbs? Re-jet? What next?
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Old 06-29-2008, 11:15 AM   #2
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backfiring through the intake means it is lean at that rpm range. backfiring through the exhaust means it is rich at that certain rpm range. when is the bike doing each? and what kind of needles did u put in? stock needles are the best for kawie v-twins.
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Old 06-29-2008, 06:26 PM   #3
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I back-fires in air box at low rpm. Through exhaust when I let off of gas. I put in the NFKL needle in the front carb as this was a supposed to fix it per Kawasaki bulletin. It has stock needle in the back carb. Machine has not had any other work done on it to my knowledge. Someone may have messed with carb adjustments.
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Old 06-29-2008, 07:04 PM   #4
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Quote:
I back-fires in air box at low rpm. Through exhaust when I let off of gas. I put in the NFKL needle in the front carb as this was a supposed to fix it per Kawasaki bulletin. It has stock needle in the back carb. Machine has not had any other work done on it to my knowledge. Someone may have messed with carb adjustments.
[/b]
Yea sounds like a lean situation like plugged jets. You really need to drain the gas and make sure your jets are not plugged. I would pull the carb and use a cleaner also. 500 miles is not much on a 05 and the gas is very old even though you tried to dilute it. Make sure the slides move freely . Pull the filter and reach down on the slids and push in. They should go in and come back out with a little resistance.
Also it should have stock needles and jets and not dynojet crap.
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Old 06-29-2008, 07:55 PM   #5
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Didn't know about checking the slides. Front one was good when I put it back in. Will check the back one. All jets are stock. I hate to pull to clean but I may have to. I don't have very good luck with carbs. Can't even get a lawnmower to run right after I mess with one. Guess I can't make it any worse.
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Old 06-29-2008, 08:06 PM   #6
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if you dont want to pull the carbs to clean them oil get your self a can of deep creep made by seafoam.
drain the fuel bowls and remove the fuel line spray the deep creep into the fuel line untill it fills up the float bowls. let sit over night and then drain out again. spray more in put fuel line back and crank it over itmight not start right up untill the gas into the carbs. once it starts dont worry about the smoke thats gona come out. its normal since the deep creep is burning off its removing any carbon in the engine.
the deep creep eats carbon and varnish, plus its a good engine fogger oil.

give that a try. the soaking should clear up the jets. plus running the lucas in the gas will also help over time to keep the jets clean.
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Old 06-29-2008, 08:42 PM   #7
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Will give it a try if I can find the Deep Creep stuff. I've never seen it anywhere here. Thanks!
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Old 07-03-2008, 07:39 PM   #8
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Just checked something else. Front cylinder is running 100 degrees cooler than back cylinder at same point on exhaust. Could problem be with rear cylinder being too lean?
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