Scooter dies when give it gas

[ctrottier]

Long story short, Bought a scooter brand new and it didn't run. Had a neighbor kid look at it and he got it running and deregulated it in the process. The scooter ran for about a week and I needed to spray 50% either started fluid every time and kick start it. On the last ride it started to strugle when I tried to accelerate, when I released the throtle it would return to normal Idol and then again try to die when I wanted to accelerate and now the scooter wont start at all.

Any suggestions? I don't have any more money to give the neighbor kid to come fix it

[D-cat]

Okay, it sounds like fuel starvation. This can be caused by a faulty petcock (or vacuum leak), bad hoses, clogged fuel filter, stuck float, any of which could also be exasperated by low quality gas.

You said you bought the scooter new. Have you (or the neighbor kid) done a full PDI on it? I'd suggest you start there, as there may be other gremlins waiting to hatch that you could exterminate while you're at it. If when you're done with that it still doesn't want to run right, take a run through Carb Cleaning 101.

[ctrottier]

New hoses, new spark plug, new fuel filter, 92 octaine in the tank, I can't remember what else he/I did

[keetarider]

What Dcat said. PDI, Carb 101.

And i don't care if its new or ran or didn't. After checking my valves and finding them screwed down tight right out of the box, check the valve gap. .004 intake .005 exhaust, works well for mine.

A piece of a pop can will be close enough, if you don't have the cash for a feeler gauge.

Good luck and keep the Dawgs updated!

[ctrottier]

Just watched the carb video, I think I'll be enlisting the help of my uncle the first time I attempt that.

[D-cat]

Oay. Let's check the petcock. Take the fuel line off the intake of the carb and place it in a catch container (a clean and dry bottle works). Then take the vacuum hose off the manifold and suck on it. Fuel should come out of the supply line in a steady flow. If it doesn't, replace the petcock (I suggest going manual for reliability, but that's your call). If it does..., just had a thought...

Make sure the air filter is also clean and there's no kinks or obstructions on any of the hoses. I am also assuming the stock air filter box is still hooked up (the big black sort of rectangular box over the CVT cover with hoses on it). If it's not, please let me know now.

Okay, after that proved not to be a problem, proceed to the Carb Cleaning 101 video. While in there, take note of your current main jet size.

Also, I never asked, is this a 2 or 4 stroke engine?

[als01seville]

Well since it was new, they usually send them to the U.S running really Lean to pass emissions. In most causes the scoots will run on the settings that the factory set. But depending where your at they may not run or run like crap. Most of the problems with the scoots is with the carbs and or leaking hoses due to not being on tight as well as the intake and clamp on the intake holding the carb.

Also spraying ether 50% of the time to get it started is not good. That indicates it is not getting gas when cold. If your carb has a Enricher(choke) it may not be connected or not working. It also may be the Air/Fuel Mixture is not set right and is TO LEAN which will give you hard starting. It also can be your IDLE SPEED screw is set to Low.

I don't know what CARB is on your scoot but does it look like this:
Alleyoop
Here is the Left Side Of The Carb:


Here is the Right Side Of The Carb:

[D-cat]

I suspect it's very lean (why I asked about the jet size). I'm also tinkering with the possibility that the diaphragm is defective, causing the carb to not even give any useful amount of gas when the throttle opens up. Whatever it is, I'm hoping it's discovered in the cleaning processes. Any problems in the carb with something this new would be manufacturer defect, but that might be little solace.

ctrottier, just curious, what's the brand and where did you purchase it?

[als01seville]

Ok, here is a very important part of the Carb for it to Start and Idle. The Intake has little tiney holes by the Butterfly that the Pilot Jet sends fuel through for Idleing and low speeds.
I tried to take a picture of the tiny holes but couldn't get a good focus of them But I pointed to them. When the butterfly is CLOSED you can see TWO Holes about 1/4 away from the Butterfly one is a tiny outlet on the bottom and the other is in the center of the intake to the right. Now behind the Butterfly there are FOUR tiney outlets they are in a Triangle shape. So as the Butterfly is say cracked open about 1/16 The 1st tiny outlet is exposed then crack it say another 1/16 then the TWO more tiny Outlets are exposed and finally if you open it yet say another 1 1/16 the Last of the tiny outlets is exposed. At that point all the fuel outlets are exposed. Thats what the IDLE SPEED SCREW is Doing for you when you Turn it Clockwise to bring your Idle Up.. Its exposing more of the tiny fuel outlets as well as more air just as if you held the Throttle a little open NO DIFFERENCE.

So its important to set the IDLE right otherwise you will have a hard time starting and keeping it from dieing out.
Here is a picture hope it explains where the holes are in RED DOTS, I have the Butterfly open to show the hidden 4 tiney gas outlets:
Alleyoop

[ctrottier]

Got the carb cleanen by neighbor kid and it works again and for now it's starting without starter fluid, The carb was very dirty on the bottom he said. I am guessing thats because there was no air filter and no gas filter put on in his attempts to get it running.

I have now added a piece of nylon at my air filter, anything thicker was making it kill. and I am going to buy a fuel filter cause it doesn't look like one is there.

I should have assumed he didn't put everything back together, tweakers always forget to button things back up once they get it started. Same thing happened with my car a few years back with a different tweaker, I just can't bring myself to pay a professional 4 times the money when a crack head will get the job 85% done for 1/4 the money

[sweden]

This sounds a bit like the problems I am having with mine and after watching the carb cleaning video, I don't think my float was springing like the one in the video, could this be my problem and make the scooter bog at full throttle and then be fine after decreasing the throttle, until back at full throttle?

Sorry for jumping in on your thread!