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Post by 2strokd on Jun 26, 2010 12:32:29 GMT -5
Maybe you dont have the fuel flow pin (not sure the correct name) on the float correctly?
Or the float has a small hole in it? On some carbs the pin that hold the float in place just slides in and the bowl keeps it there. The float could have been accidentally "moved" and the adjustments off? I have done that by accident before...
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Post by redorchestra on Jun 27, 2010 5:51:49 GMT -5
I took it apart again and checked the float. If I blow through the air line and then raise the float with my finger it cuts the air flow when it is parallel to the carb. My only limited success came from picking the bike up and dropping it on it's centre stand. It must be binding on something.
Well time to take it to the expert, or, well... the guy who is close enough to push it to his shop. He over charges me and does shit work, but he's close to my home.
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Post by duosport on Jun 27, 2010 9:40:23 GMT -5
Lets be logical here. You may have a couple of problems at the same time or only one problem. I think the thing to figure out is about fuel level in the carb. Is the fuel level too high? How do you know? If it is then that is likely one of you problems right? So I would take the carb off the scooter do an experiement. I would remove the bowl and set up a fuel tank over the carb with a connecting line. I would fill fuel in a funnel tube assembly and see what happens with the float and needle vavle. If fuel is flowing through the carb and then you push up on the float, does it cut off the fuel supply? If so then maybe your carb is not flooding at all. Or maybe the floatis not lifting up when the bowl fills( though that should show evidence of having gas inside of it).
You need to start crossing off things on a list and see what you are left with.
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Post by duosport on Jun 27, 2010 12:10:57 GMT -5
Also doesn't the choke bypass the normal float valve and supply additional fuel that way through a seperate port? Is it not possible that the fuel is overwhelming the carb in general via a failed choke?
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Post by redorchestra on Jun 28, 2010 3:49:42 GMT -5
Here is what I know! If I leave it as is, it doesn't run. If I open the throttle wide, I can get it run, but poorly. No power to turn the wheel. If I open the drain on the carb bowl to a slow dribble the scoot will run and make power and idle properly. LOGIC dictates that my bowl is overfilling. I can not for the life of me figure out why. There is no hole in the float. Float needle valve is good. The float moves freely without the bowl on. With the bowl on...I can't tell, but my hypothesis is that it doesn't. Why...I don't know.
Wouldn't a failed choke, just be an open choke. I guess it could be the auto enricher. That is what I thought the problem was in the first place. The original "something happened" problem.
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Post by 190mech on Jun 28, 2010 5:33:29 GMT -5
Here is a tip,remove the drain screw,wedge a clear plastic hose in the hole,bend the tube up along side the carb,turn on the fuel,look at the fuel level in the hose,should be slightly below float bowl gasket.Adjust float as needed  |
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Post by redorchestra on Jun 28, 2010 5:41:24 GMT -5
It's a good tip to visually see the level, but I can't change it
There is no adjustment on the float. The float has a plastic arm that cradles the pin. Unless there is an adjustment on the pin!
I know there is a little spring loaded piece right on the back of it. Can that be adjusted?
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Post by 90GTVert on Jun 28, 2010 7:41:59 GMT -5
If the enricher was bad I wouldn't think draining fuel from the bowl as slowly as you describe would have much affect. If you suspect the enricher you can pull it off and plug the hole in there with chewing gum. See if it improves. I really think it's going to be a fuel level issue though. Just look at anything metal and see if it can be bent to affect float height. You may be able to bend the float needle's "hanger".
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Post by 2strokd on Jun 28, 2010 8:16:54 GMT -5
Almost sounds like an air passage is clogged in the carb?
By opening the screw at the bottom of the carb your letting that air in, that in turn will
let the fuel come out of the bowl and into the carb. If the "vents" are plugged in your carb
it wont wanna run, or want stay running long.
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Post by redorchestra on Jun 28, 2010 9:19:57 GMT -5
Almost sounds like an air passage is clogged in the carb? By opening the screw at the bottom of the carb your letting that air in, that in turn will let the fuel come out of the bowl and into the carb. If the "vents" are plugged in your carb it wont wanna run, or want stay running long. This sounds promising. I ran the scoot for I don't how long after the air filter fell off. A clog seems very likely. I cleaned just before this happened but I didn't think to clean it again after the filter fell off. I'm going to be able to take the carb off and open it in my sleep by the time I get this fixed. Sorry Mr. Mechanic. One more try before you get it! |
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Post by duosport on Jun 28, 2010 11:10:00 GMT -5
Is the bowl overfilling? how do you know? The suggestion of using the clear hose to see level is a good one. If the level is roughly OK you can strike many things off your list. I could see that it could be a float level issue or a not sealing completely float needle issue. Both would have similar effect. The fact you can run all out a bit suggests too much fuel that the engine can almost eat up at high speed. You are blowing air through the carb with your mouth but I am not sure you can detect a small leak by. If you set up a fuel line you could see if fuel is leaking by. The ends of those float needle valves are what? Nylon? If they get distorted I could see drip[ing of fuel into the bowl messing things up.
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Post by 190mech on Jun 28, 2010 18:16:45 GMT -5
The float needle is tipped with 'viton' a fuel resistant rubber,next teardown please remove the seat also and inspect underneath, inside the body for any funk that may be lodged in there,the float level can be set by shim washers under the seat.How many miles does this carb have on it?possible that ya just have a worn out needle and seat also..
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Post by redorchestra on Jun 28, 2010 23:52:48 GMT -5
The float needle is tipped with 'viton' a fuel resistant rubber,next teardown please remove the seat also and inspect underneath, inside the body for any funk that may be lodged in there,the float level can be set by shim washers under the seat.How many miles does this carb have on it?possible that ya just have a worn out needle and seat also.. What is "the seat?" It that what the viton tip of the needle fits into to stop the flow? On my carb the seat is not removable. It is just a hole in the carb body. The carb is probably original from the scoot (1998), but I think it was rebuilt last May when I bought it. The carb was spotless when I took it apart last week. The needle is fine and the gaskets are perfect. The shop I bought it from has a great reputation and I know why. This bike would still be working perfect if I didn't keep messing with it. My theory in life, how can you learn about it if you don't break it. I just hope, I don't have to learn about my arm, leg or head, ever! |
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Post by 190mech on Jun 29, 2010 4:33:53 GMT -5
Youve got a non removable seat,Your only option is to replace the needle with a new one and hope that lowers the float level..
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Post by duosport on Jun 29, 2010 6:56:35 GMT -5
Is the fuel level too high in the bowl? How do we know this? What is the evidence of this? This is an assumption we are working on.
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