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Post by kholiday05 on Jan 7, 2007 23:23:44 GMT -5
after a recent watercrossing[nearly sunken]my sons 03 sportsman backfires from carb into the airbox. after basic post water maintinence ofcoarse. 600twin compresson is130psi on both any suggestions greatly appreciated
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Post by Drew RZR 800 on Jan 8, 2007 7:28:38 GMT -5
Water in the tank/carb, Broken/ loose plug wire , is the bike still steaming when running , if so the the Exhaust may still be full of water .
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Post by Administrator on Jan 8, 2007 9:39:26 GMT -5
backfiring thru the carb is most always caused by water or a lean mixture (cold with no choke)
drain your carb's float bowl. Should be a drain screw on the bowl at the bottom of the bowl.
just for safe measure, Count how many times you turn it, incase you have the idle mixture screw by mistake.
also you could add some "dry gas" or gasline Antifreeze... is how the bill it. It's isopropal alcohol. It breaks down the water in the gas and gets rid of it
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Post by kholiday05b on Jan 8, 2007 22:48:48 GMT -5
STILL BACKFIRING! I added some water out changed plugs dielectric in plug boots plug wires [look ] good other wiring connections look ok removed the snorkeled muffler ran it with strait pipe had same results it starts fine pops somewhat constantly wont take throttle unless choked alittle then backfires like crazy intake and exhaust new rt hand plug came out exhaust fouled left side looks norm thanks for the help please keep it coming want to eat up some mud this weekend!
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Post by Administrator on Jan 8, 2007 23:12:06 GMT -5
you may have some water in the carb passages..run it, idleing, get it operating tempreture.. and let it just run awhile...
a tight intake valve can cause the same problem, but it wouldn't come about because of going in water.. but it could be conciendence......
does it idle good?
maybe you need to adjust the throttle needle up one click to richen the mixture. ie move the needle UP.. but the c clip Down on the needle.
also... CHECK THE SPARK PLUG WIRE... LOOSE, POOR CONNECTION, WATER INSIDE... CAN CAUSE IT TO BREAK DOWN UNDER A LOAD..
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Post by kholiday05 on Jan 8, 2007 23:56:31 GMT -5
I cleaned the carb alitle couldnt drained bowl couldnt get the screws on bowl loose blew thru the vent tube sprayed carb cleaner think ill drain tank dont trust water out but tried it anyway plug wires and boot connections seem good how can i proove it havent messed w carb settings yet ill raise idle and let it run awhile tom nite idles ok minor popping can feel it w my finger on the carb to intake hose if i pull the air box cover off i can really hear it
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Post by Drew RZR 800 on Jan 9, 2007 10:36:21 GMT -5
How bad was this thing swamped , was the air box full of water ? was it a clean water swamp or muddy water , did you get water in the oil, if so you are having other problems . If your oil is cloudy , has a foam on suface when cool then there is water in the oil , and more than likely in the front and rear diff, trans and possibly brake system . I have a 600 twin and so far have been really lucky that I have not had this problem . The only time I had a problem like what you are having is when the little foam spacer that holds the engine and belt tube was worn , it will let the carb tube rest on the gas tank and shut off the air , but you mentioned that you are snorkeld , could your snorkel be cloged ? If your bike sat in water for a while you could also have water in the CDI box causing a short . You mentioned using water to clean the carb , use only carb cleaner to clean the carb in the inside , water is the enemy , and you really need to drain that carb before moving on to electornics . Good luck
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Deleted
Deleted Member
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Post by Deleted on Jan 9, 2007 13:37:07 GMT -5
How bad was this thing swamped , was the air box full of water ? was it a clean water swamp or muddy water , did you get water in the oil, if so you are having other problems . If your oil is cloudy , has a foam on suface when cool then there is water in the oil , and more than likely in the front and rear diff, trans and possibly brake system . I have a 600 twin and so far have been really lucky that I have not had this problem . The only time I had a problem like what you are having is when the little foam spacer that holds the engine and belt tube was worn , it will let the carb tube rest on the gas tank and shut off the air , but you mentioned that you are snorkeld , could your snorkel be cloged ? If your bike sat in water for a while you could also have water in the CDI box causing a short . You mentioned using water to clean the carb , use only carb cleaner to clean the carb in the inside , water is the enemy , and you really need to drain that carb before moving on to electornics . Good luck I believe he used a product called water out, not actually water. Its definently lean for some reason, the carb may be blocked up with some dirt or something too if it sucked any muddy water in the carb at all, doesn't take much. You may want to take the carb off and disassemble it and clean it very well.
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Post by Administrator on Jan 9, 2007 18:18:52 GMT -5
If all the items listed fail... take it to Wall to Wall, an ATV Shop in Mt Airy area.
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Post by Matt H (aka Tiger Rag) on Jan 9, 2007 23:32:14 GMT -5
Check all of your electrical connections and put dielectric grease in every plug and connection you can find. May not be the fix in your case but it won't hurt. I've seen this be the cause of a poor idle and backfire before though.
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Deleted
Deleted Member
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Post by Deleted on Jan 30, 2007 1:21:27 GMT -5
An engine will back fire through the intake for two basic reasons. The intake valve is not closed during detonation or its detonating early. Early detonation has several of its own causes including a lean mixture.
I do not remember the setup on the 600 twin carb, but i assume that its one carb feeding both cyls. If thats the case a carb out of adjustment or being a cause of the problem should show you on both spark plugs and not just one.
If you want to test the lean/rich as to if its the problem, do this. While at idle and the air box removed take a propane torch (like plumbers use) and feed the propane gas in the intake of the carb. This will give the engine a nice rich mixture (propane being high octane added to the existing delivery of fuel). The engine rpm will rise some, however if it fixes a lean mixture it may lessen or stop the backfire.
Have you changed your plugs? A plug can run cold or hot, causing a similar issue in a multi cyl engine.
Water in the fuel bowl will cause them to backfire. My first though is to remove the fuel bowl, clean and drain. If you have removed the carb and drained the gas out of the bowl be careful about turning it upside down. Floats have a tendency to stick when this happens.
Does your exhaust reek of gas while its running or backfiring?
Lots more things to go over. Eyeball some of these and post an update.
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joe p
Novice Trail Rider
Posts: 75
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Post by joe p on Feb 8, 2007 10:10:10 GMT -5
The Bowl must be drained us a pair of plires to grab the end of the screw head, careful not to break it of in the carb, after broke loose use a regular screw driver to loosen. Don't over tighten may need to loosen in the future.
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