i have a 92 suzuki rm80 w/ mikuni carb. when i turn the gas on it keeps flowing til it overflows the carb. it just wont stop. what do i do. or do you know a site.
2007-05-09 16:34:30 · 11 answers · asked by seaandjae 1 in Cars & Transportation ➔ Motorcycles
this just happened to me!! this is how i fixed it. shut off the fuel going to the carbs. remove the drain screw at the bottom of the carb. be prepared with something to catch the gas that will come out of it. (about a cups worth). then i took some carb cleaner and slipped the nozzle into the carburetor drain hole and gave it a couple of shots of cleaner. leave the drain screw out and turn the fuel back on. again be prepared to catch the fuel coming out of the drain hole. i shut the fuel off to the carburetor after about 10 seconds or so. letting the fuel drain out as it is entering the carb will help flush away rust and gunk inside the carb. during the flushing i got some red fuel, indicating there was rust that kept the needle and seat and float from working correctly. after flushing put the drain screw back into the bottom of the carb. my carb leaked out so much fuel that it came into the air box, so check that as well. i also put new spark plugs in because they were ruined from the engine running so rich. you should also change the oil and filter because some raw gas probably got past the piston rings and this will contaminate the oil and could effect clutch operation. if this flushing doesn't work, then you may have to overhaul the carburetors. pay particular attention to the needle and seat, and to the float.
2007-05-10 14:25:45 · answer #1 · answered by Anonymous · 0⤊ 0⤋
As you've probably noticed, everybody says it is the float/needle and seat. They are correct. The other factor you need to think about now is how long has the bike been sitting, and does it have than just the needle and seat issue to be taken care of? When you take the float bowl off to repair/replace the needle and seat, check the jets to see if they are clogged as well. Your bike is two-stroke, unless I am mistaken, and the gas-oil mix can gum up your carb pretty quickly. Next time you park the bike for a week or more, run it with the petcock shut off until the carburetor is empty, or close the petcock, turn of the bike, and drain the bowl (There is a screw near the bottom drain hose or a bolt under the bowl.) You'll have less trouble after that. If you do decide to clean the jets out, use carburetor cleaner and compressed air, if you have it available. People sometimes use wire and that may work but you could also damage the jets. If the jets are dirty, and you have compressed air, spray some carb cleaner into the holes where you removed the jets and follow it with some more compressed air, to clean out the passages. Wear eye protection, carb cleaner or old gas in your eyes sucks. Good luck!.
2007-05-10 01:11:42 · answer #2 · answered by Sospelotudo 1 · 0⤊ 1⤋
The most common cause for this is stuck floats. Carburetors are kind of sensitive and if you do not know what you are doing you may do more harm than good.
The float bowl needs to be removed ,the floats inspected for damage or leaks, cleaned and the settings checked.
As long as the carb is open might as well clean the jets as well.
You would be wise to have someone with experience help you.
2007-05-10 00:24:26 · answer #3 · answered by Anonymous · 0⤊ 1⤋
sounds like your float is not floating!
it could be sticking because of dirt, or it could have a hole in it so it cant float, or some other floating problem. the float is what shuts the gas flow off until you need more. the valve that the float attaches to, could have dirt in it too, keeping it from sealing shut. I could fix it for you, if I was wherever you are, but Im not, so you will have to do it. Its easy to do, just dont loose any parts. and make sure you look at it before you disassemble it, so you can put it back together correctly.
2007-05-09 23:41:00 · answer #4 · answered by Big hands Big feet 7 · 2⤊ 0⤋
Either the float is stuck down, or the needle and seat that the float operates is worn out or dirty - this is the most likely, unless you've been playing with your float chamber lately. This will let fuel keep trickling past the needle and seat, and fill the float bowl. Generally, it isn't adjustable, meaning that the needle and seat will need replacing, but a new needle and seat is pretty cheap, and easy to install.
2007-05-10 00:41:20 · answer #5 · answered by Me 6 · 0⤊ 1⤋
Honestly, it's probably just your float in the bowl of the carb. When the float bowl fills with fuel and the float rises, causing the valve to close and not allow any more gas in. Similar to a toilet
2007-05-09 23:39:58 · answer #6 · answered by adam_f_1984 2 · 0⤊ 2⤋
sounds like the float is stuck (down) just like the float in a toilet; you know when the float is held or stuck down wah-wah keeps coming in. but I think greg is on the right track w/the needle & seat (the valve that the little tab in the center of the float rides against (up & down) up: float bowl full of gas w/little needle closing off fuel to bowl. down: little tab/float away from needle letting fuel enter the bowl. hope this helps....
2007-05-10 02:17:41 · answer #7 · answered by HUZZLER 2 · 0⤊ 1⤋
your needle and seat is worn or has some dirt trapped in it.give the side of the carb a couple of gentle tap's with th handle of a screwdriver to see if you can free it up. if not you will have to remove the carb take the float bowl off and change the needle and seat.
2007-05-09 23:47:36 · answer #8 · answered by greg e 4 · 4⤊ 1⤋
The float in the bottom has a peace of dirt keeping the float down and flowing the carb.
Remove the bottom, and remove the needle and the dirt under the float.
2007-05-09 23:56:23 · answer #9 · answered by goldwing127959 6 · 1⤊ 2⤋
Either the float is sticking, or the needle isn't seating, maybe some gunk stuck in between the needle and seat.
2007-05-10 01:28:53 · answer #10 · answered by strech 7 · 0⤊ 1⤋