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Post by winger61 on Aug 7, 2024 10:35:43 GMT -5
2018 Icebear 50cc 4 stroke trike leaks fuel from hose on bottom of carb while cranking. I removed the carb and float cover. It all appears to be ok. The float and needle moves freely. No reason for the needle and or seat to be damaged when it has had no indication of trouble prior to this issue. Reassembled, same issue, leaks fuel and no start. I pinched off that hose and stopped the fuel from running out, but still no start. I verified there is good spark to the plug. Why would the fuel be coming from the hose in the bottom of the carb? I found a $23 carb on Amazon. Should I start there?
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Post by FrankenMech on Aug 7, 2024 13:36:28 GMT -5
You may have an open or missing bowl drain valve. One is found in the bottom of the bowl and the other type is found in the end of that hose. Find out which it is and fix it. Use some starting fluid and see if the scoot starts. It takes time to fill the float bowl with fuel when empty.
The new carb will take time and effort to tune to your engine and intake system.
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Post by winger61 on Aug 7, 2024 14:38:27 GMT -5
 I found it. It has a screw in the bottom and was backed off a bit. Fuel was running right through it. I was able to get it started, but it lacks power and is slow/hard to start. A burst of starting fluid will get it running, but it lacks power. |
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Post by FrankenMech on Aug 7, 2024 15:16:10 GMT -5
Excellent work! Get out that service manual you downloaded and study the troubleshooting charts. Follow the steps exactly. A fuel leak should not cause a loss of power now, -unless you damaged something inside the carb or it had been running lean. You should have noticed a lack of power before the fuel leak was noticed if it was running lean.
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Post by winger61 on Aug 7, 2024 15:32:27 GMT -5
Excellent work! Get out that service manual you downloaded and study the troubleshooting charts. Follow the steps exactly. A fuel leak should not cause a loss of power now, -unless you damaged something inside the carb or it had been running lean. You should have noticed a lack of power before the fuel leak was noticed if it was running lean. Thanks for your input. It’s not mine. I’m not sure how well it was running before I got it. I kind of got stuck with this to help a lady out. She is not a very good source for performance history as she didn’t even know the wet spot under the scoot was gas. I do need to work the throttle back and forth a bit to find a “sweet spot” where power improves. Almost seems like it might be a bit lean. It definitely doesn’t smell rich in my shop. I don’t think there is any real adjustments on the carb. Thanks for your input. |
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Post by FrankenMech on Aug 7, 2024 17:47:27 GMT -5
LOL, a 50cc will always lack power unless the rider weighs less than 5 pounds. That 50cc 4T engine is just very small and the scoot itself is heavy. There is not much you can do about it unless you can repeal the laws of physics. Those trouble charts may help find some problem just remember not to be the 'last person to touch the scoot' and therefore you are then responsible for every future problem.
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Post by winger61 on Aug 8, 2024 7:20:59 GMT -5
LOL, a 50cc will always lack power unless the rider weighs less than 5 pounds. That 50cc 4T engine is just very small and the scoot itself is heavy. There is not much you can do about it unless you can repeal the laws of physics. Those trouble charts may help find some problem just remember not to be the 'last person to touch the scoot' and therefore you are then responsible for every future problem. Yes, for sure. I understand what it is to “own” a vehicle after 26 years in the car business! It’s running now and that’s better than it was when I started. Thanks again, you were very helpful! |
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Post by GrumpyUnk on Aug 8, 2024 10:59:10 GMT -5
Read on site about using a spark plug(new or VERY WELL cleaned) to indicate if the fuel mixture is prope, lean or rich. They call it a 'plug chop' where you ride so far, cut off the ignition, coast to a stop and pull the plug.
It is one way to check your mixture.
Have you checked the normal 'power' things: air filter, tire pressure, fuel flow, and ease of pushing by hand? The last should indicate dragging brakes or bearings that are not the best.
tom
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