New 50cc Chinese Scooter Wont Start ( Is Hissing ) By straightbangin (Read 16,528 times)

[Alleyoop]

Good that the Petcock will be replaced, and hope the starting problem is not a nasty one but maybe the Spark Plug is not on tight and allowing air to escape.
Alleyoop

[straightbangin]

I know its not on tight. I just have to see why I can't get the cap on tighter ( I've tried ) maybe if I still can't get it on tight some electrical tape will help keeping air from escaping. I'll get to that one after I get the tank back together. Wow it would be great to get all these issues solved TODAY. That is the goal

[gatekeeper]

Good going so far! Question; the way the starter is acting in your video, starting and stopping while you continually are holding the start button down, did it act this way before you took the CVT cover off or just since the cover has come off? If it is just happening since the cover came off there may be nothing wrong. There is a lot of torque coming from the starter motor and the cover provides the second anchor point for the bendix. Without that pilot bushing in the cover there is a lot of sideways force being applied to the bendix. It might be enough to cause the gears to bind momentarily.

If the bendix is slightly oily or greasy I'd leave it like that, or clean it with carb cleaner and then apply a little bit of lithium grease.

the bendix appears to function as it should. It doesn't matter that it isn't spinning out to meet the larger gear when you turn it by hand. The faster spin of the starter, centrifugal force is what does it. If you were to take the bendix out and hold it in both hands then turn it, it would probably move out then.

I wipe down the inside of the CVT cover every time I take it off. Over time, built up dust/grease helps hold in heat and you want the CVT to shed as much heat as possible.

Be careful to not let any grease/oil, new or old, get on the belt or the belt drive faces of the front and back pullies.

Lastly, I don't remember if you bought a new battery for this scooter or not. Some of these original equipment batteries start to break down quickly and not hold a good charge for long after being put into service.

[Alleyoop]

No, I am not talking about the Coil Boot Cap that goes on the Spark Plug, I mean the ACTUAL spark plug make sure it is SCREWED on nice and SNUGE don't crank on it but nice and SNUGE. The Boot Cap look inside and make sure the Brass Clips are not broken that grab the Spark Plug. Also the Spark Plug itself SHOULD not have the Screw Cap on it. The Spark Plug END that the COIL BOOT goes on should have the threads so that the Brass Clips Inside the BOOT CAP grab it and stays on.
Alleyoop


You may need a new Plug Cap if the Clips inside the Cap are broken they just screw off the Wire and screw on:

[straightbangin]

thanks gatekeeper. it was doing that before I took the cover off. no i didnt get a new battery. I did for my old scooter a month before i sold it but w this one i charged it full less than 48 hrs ago.

thanks alley I'll check it out.

[straightbangin]

This is what my spark plug looks like



The thing under my finger at the top has threads on it. No cap. Do some sparkplugs come with a cap?

The boot seems to catch everything well. When I push it over the spark plug it clicks on ( like a nail over a comb sound )

I have the gas tank back in and all that stuff back on. I just realized the tank was empty when I took it off, maybe it wouldn't start due to lack of gas. Wow I'd feel dumb. I'm going to inject some gas in the line. Put the cover back on the bendix. If it starts I'm going to the gas station to fill the tank, and put some sea foam. If it doesn't start then I dunno, I'll let you know

[Alleyoop]

Great, was just making sure no cap was on the Plug( your plug is ok) the Cap grabs the threads. And yes you do hear or feel a clip when you snap on the Boot Cap onto the plug that is good.

Fantastic that you got the tank back in and Hopefully it would not start beacause of NO JUICE.
Got my fingers crossed for you that once gas starts to flow up to the carb and fill it up it will run great.
LET US KNOW HOW IT GOES.
Alleyoop

[straightbangin]

The petcock is back in and all the faring is back on it. It still will not start so its not a gas issue. Read what is hopefully my last post in the petcock saga thread:
www.scooterdoc.proboards.com/index.cgi?action=display&board=150cc&thread=4761&page=17

So back to the drawing board on why it will not turn over. It is still making that bad noise in my video.

1 ) I'm wondering if all the injecting of fuel could have caused the spark plug to foul.

2) I'm also wondering if somehow I could have drained the battery in 36 hrs. I know I just charged it up and only started it a handful of times but the full battery does seem to make it start. My trips in the past 36 hrs when it WAS working WERE short. (About a 5-10 min drive each trip, each way) Could that have drained the battery back down in one day? I can't imagine it could because I always take short trips.

3) Another thing I am wondering is about the compression. There is a hole in the side of the ... hmmm, thingee? (the thing the carb is mounted to) LOL. In this hole is where the spark plug gets screwed. Now when I press the coil boot cap onto the spark plug all the way ( as far as it will go), it does catch and all that BUT there is still open air that can flow in and out of that hole where the spark plug is screwed in. The coil boot cap has a rubber flat circle thing on it but it does not and will not fit flush against the side of the thingee the carb is mounted to. There is about a 1/3" gap there. It never has fit tight there though so I don't know why this COULD be a problem now. Could this gap be causing an issue with the compression?

4) Would it be worth it to charge up the battery all the way AGAIN AND REPLACE THE SPARK PLUG AGAIN and see if that helps? Or should I try something else?

At least the petcock is replaced, its put back together and it has a full tank of gas with sea foam in it too and at least I feel accomplished for what I did TODAY. Glad I finished putting the whole petcock replacement off. Once you are into something its not that bad, pushing it off and having it hanging over your head that you still have to deal with something seems worse.

[royldoc]

If I understand this right. The thingee you are referring to is a black plastic engine cover, known as a cowl. It is for engine cooling and has nothing to do with compression. Did you Test the new petcock now that you have fuel in the tank? Sometimes even new ones are bad. If it is good You should Make sure the float bowl on carburetor is full. Apply a vacuum to the petcock for a short period to let the bowl fill up.
Check for spark. Hold the plug on the valve cover of engine and crank it over.

Roy

[straightbangin]

Cowl. Thanks.

Ya I forgot to test it. Alley had me suck the vac line and have the fuel line in a cup to see if gas came out of it. I will have to try that tomorrow. By the time I got it all back together it was dark out. The bowl is full, I injected fuel into the line that goes to the bowl before I took it for gas hopeing it would start and get me at least to the gas station 6 blocks away. I've been injecting gas into the line every time I'd get stranded because the petcock would stop working ( it has worked on and off since I got the scooter new 2 mo ago)

I checked for spark recently, but I'll check again tomorrow. Thanks.

[Alleyoop]

Yes, charge up the battery again, 5-10 minute rides will usually not charge up the battery. So it appears that is going to be a continueing problem for you. When starting the engine it takes a lot of juice from the battery. The next battery you get you need to get one with a lot of CCA(COLD CRANKING AMPS). I am sure the battery that is in there has very low CCAs.

No need to worry about the opening where the Spark Plug is. When the motor is running the fan is blowing air under the BLACK PLASTIC covers around the engine to help cool it.

Yes, check for Spark, Ground the plug on the engine and when you screw it back on make sure it is NICE and SNUGE. YOu see the washer on that plug well if it on right that should be squeeshed, if it is not then you are not tightening the plug down enough, that is what seals the hole so no air escapes.
Alleyoop

[straightbangin]

Ok cool, thanks. I'll try those 2 things tomorrow. Does more CCA means larger battery size? I have such a small spot for my battery to fit. I THINK its 12v / 7 ah. I'd love to get something w more juice but usually that means bigger and I can't just extend the cables and have the thing in my trunk because the trunk won't latch shut and someone would just steal the battery out. In my town if you leave a bike locked to something, within 30 min all the parts will be stripped off it in broad day light so I don't leave anything in my trunk. Its crazy that I live in a beautiful and wealthy city but still have scum bags like that all over. When I had the faring off that was attached to the thing w/ the trunk latch. I was really looking it over and making sure it looked centered ( the latch ) and playing with it and I really can't figure out why it wont latch right. Well it does like 10% of the time but its luck when it does. Not a huge deal to me.

[Alleyoop]

Measure the battery, WIDTH, HEIGHT and LENGTH. Also see if a battery say 1/2" TALLER will it fit. Reason I am asking is because Usually the 9A batteries are a little taller but you can usually find one the same size as the 7A EXCEPT for the height.
ALleyoop

[straightbangin]

It would have to be an exact fit I have to press down on the lid to get it to shut as it is I'll have to see what the CCAs are when I charge the battery too. I have no idea what mine has. Thanks.

I'm pretty sure this is the one I have. It doesn't say how many CCAs it has from the ad. Maybe it will say on the battery somewhere. ** edit / delete link from ebay ** (nope thats not the battery I have )

[royldoc]

I have to compliment you on your persistence. After you charge the battery and test for a spark. If you get a good blue spark, replace the plug as per Alley's instructions and try to start. If it does not start. Pull the vacuum hose that goes to the petcock off at the intake near carburetor and squirt about a teaspoon of gas in the intake, replace the vacuum hose and try to start.

Roy