Scooter stalling and cutting out

[sifu]

Well it seems like the local place ripped me off then! He sold me the "item" as shown above and said it would do the same thing as the one pictured below which I showed him:

standard.nexcess.net/media/catalog/product/cache/1/image/5e06319eda06f020e43594a9c230972d/g/y/gy6_vacuumfuelpump.jpg


I've tested both the pump I have now and the new one i bought by connecting a small vacuum pump through it but it doesnt seem to "pump" fuel out?

BTW ILLGotti I can get the scoot running but my problem is that if I leave it for a couple of hours I have to "prime" it again and its damn annoying.

Seems like I may have a leak somewhere causing the fuel to come out of the carb OR vacuum is not strong enough for it to start pulling fuel?

Once started it runs normally so that must mean the current pump I have (im still running the old one, installed the new "pump" but it didnt work so stuck with the old), must be working doesnt it?

[sifu]

Ok guys heres something I observed today while trying to start my bike (again)


Electric/Kick starting the thing wasnt working so I decided to open up the screw on the end of the drain tube to see if there was any fuel in the float area, upon doing so some gas did come out but very little. At a guess I would say the most that did come out was about 5-10ml.

Looking at the fuel filter I could still see gas in it, therefore that should mean that fuel is still flowing into the carb??

Frustrated i took the carb out very carefully and placed it on the ground. I decided to tear it open and see if there was anything usually inside, upon turning it upside and starting to loosen the float bowl and what not, tonnes of fuel started pouring out of the actual carb.

Correct me if im wrong here guys but doesnt that mean that alot of fuel is getting into the carb itself but it doesnt seem like its floating into the carb bowl area? (based on the drain tube details above).

All your feedback will be greatly appreciated! Im really desperate to getting this thing running smoothly again!!

[cruiser66]

The original fuel pump will not pump gas when a steady vacuum is applied because it works with a pulsing vacuum input like you would find at the intake manifold. The only place gas is stored in the carb is in the float bowl so it sounds like gas is getting in there OK. The hard starting problem sounds like the auto enricher is not working. This receives power from the stator when the motor is running. The auto enricher is in the enrichment position by default when the engine is cold. The needle could be stuck in the extended position which is no enrichment or the fuel enrichment channel in the carb could be plugged.

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[sifu]

thanks alot, that would confirm why putting a vacuum source to the pump didnt make it pump anything.

Question know though, if i left the en-richer not connected to the carb will that cause any issues? what will happen if i made up a plate to seal up that hole??

[cruiser66]

The result would be the same as always having the choke on or the enricher in the on position. The scooter would run too rich after it warms up. Some members have removed the enricher and adjusted the carb to compensate for the rich condition. I would think this would make the scoot difficult to start when cold just like you have now.

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[als01seville]

Sifu, If you disconnect or seal up the hole, you will be running rich all the time. Then you will have troubles at throttle positions. Check to see if the enricher is working or not. Take it out from the Carb and cover the hole with your finger or something. Then start it up if it starts and idles up and stays running then its the enricher. You can also check the enricher itself by checking if the needle EXTENDS out as the engine is warming up. If it doesn't extend out then the enricher is bad. It could also be stuck in the extended position so you can try and put a little pressure on the needle with your finger and see if it goes in. If it goes in you can wait a while let it cool off and then start it up again and watch the needle to see if it extneds out. But if it doesn't extend out you need a new enricher, they are not expense around 15.00 bucks or so.
Alleyoop
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[sifu]

Thanks guys, I have a spare enricher laying around so I'll just take it from that and see if the problem still persist. It was of another scooter that I never had any problems with so chances are its 100% working on that one. I will however try out this enricher as well when I have some spare time and see if its a dud or not.

Speaking of the enricher though, I was always under the assumption that the running rich/lean was based on the jets? isnt that why there is different size jets to use???

Btw im on the other side of the world where its dead summer, 30 deg C today! Was under the impression that people only had problems with "cold" starts

[als01seville]

Sifu, Usually the only time you need to change Jet sizes is when you upgrade things like put a UNI Filter or any FREE FLOW Filter which lets a lot of air in. Then you won't have enough fuel delivery. So you would put in a bigger Main Jet and probably one larger Pilot Jet for your idle.
Free Flow Filters let a LOT of air in.

And no it still needs more fuel to start so even in the summer your enricher is working.

But thats great that you have another enricher you can try. But if you have not modied anything what you have in there regarding the jets you are fine.
Alleyoop
Alleyoop

[cruiser66]

The enricher is supposed to work for only about a minute when first starting the scoot until it gets warmed up a bit and can run smoothly. Internal combustion engines need enriching or choking even during the summer in order to start from cold. Once the enricher extends its needle to shut off the enricher circuit in the carb, the jets are the main determining items in the carb which determine mixture.

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