Jet Needle (?) Stuck

[farmhand504]

I have a 2013 50cc. Haven’t drove it in about 2 years so I decided to get it running again. I’m currently rebuilding the carburetor and I cannot remove what looks like a needle under the main jet. I removed both jets (pilot and main) and have new ones ready to replace.
I’ve watched videos where this part comes out after you remove the main jet. Mine’s not budging. I’ve also removed the top cover of the carb and the plate jet isn’t moving as well.

Any advice would be greatly appreciated! Thanks!

[Baizy]

If I'm understanding things correctly you're trying to remove the vacuum diaphragm that also has the needle in it.

To remove it you would remove the top cover plate (as you stated you have) and it should more or less fall right out. If it isn't just falling out take a screwdriver and gently pry up on the diaphragm from the intake (open) side of the carb. That should pop the diaphragm loose. If it feels too tight you can also use a 6mm deep socket down the center of the diaphragm and lightly rotate it CLOCKWISE in an attempt to loosen it. If you rotate it counterclockwise you will remove the needle retainer and potentially cause yourself issues by doing so. Have fun cleaning your carb, and happy riding!

[farmhand504]

Thank you Baizy! I was able to remove and clean both parts! I reinstalled the carb and attempting to get it to start.

I have replaced the battery, spark plug, fuel pump, fuel filter, clean gas tank & gas.

Attempted to start...no luck. I press the starter and the engine does try to turn over. Also the back wheel turns slowly but as soon as I release the starter it dies.

Any advice for my next step? Thought about using some
Quick starter.

Thanks!

[Baizy]

Sept 14, 2020 17:49:39 GMT -5 farmhand504 said:

Thank you Baizy! I was able to remove and clean both parts! I reinstalled the carb and attempting to get it to start.

I have replaced the battery, spark plug, fuel pump, fuel filter, clean gas tank & gas.

Attempted to start...no luck. I press the starter and the engine does try to turn over. Also the back wheel turns slowly but as soon as I release the starter it dies.

Any advice for my next step? Thought about using some
Quick starter.

Thanks!

Hey Farmhand glad you got the carb all taken apart! Here are some ideas that should help you get yourself off to the races

Couple little idiot things I've done before
*check that the fuel drain screw at the bottom of the float bowl is tight! I left it open once and just had all my fuel hit the floor
*It's important to prime the float bowl after an overhaul. You do so by turning the ignition on and off a few times. Listen for that little clickclickclick of the fuel pump and cycle it maybe 5 times before attempting a start. Everything could be fine and dandy, but if the carb isn't full of fuel yet it won't start!

If those 2 things aren't your problem check out this list.

1. Make sure you plugged everything back in -we all forget things on occasion

2. Check for spark -should take all of 5 minutes to do. Ask google if you're not sure how to do it.

3. Check the spark plug gap is right -you'll be wanting 0.030" to 0.035" thousands of an inch, think the thickness of a quarter.

4. Check for fuel -pull the fuel line off your carb and turn the key to on. Fuel SHOULD come out so have a cup or rag handy to catch the spillage!

5. If you haven't found something wrong yet just slap it back together, twist the right grip to full throttle and give it a couple kicks. You might just get lucky!

Hope this sorts you out! Have fun wrenching!

[farmhand504]

So I checked all the above. The engine would start but not stay idle. I could rev the engine but after a minute the battery would die and would not stay idle. I recharged the battery and had the same results. I used the crank start but it would only start for a brief second and die again.

Thoughts??

[Baizy]

Sept 15, 2020 16:15:27 GMT -5 farmhand504 said:

So I checked all the above. The engine would start but not stay idle. I could rev the engine but after a minute the battery would die and would not stay idle. I recharged the battery and had the same results. I used the crank start but it would only start for a brief second and die again.

Thoughts??

At the moment it sounds as if your battery charging circuit isn't working. You can easily check if it is by attaching a multimeter to the battery terminals and watching the voltage. If it goes up, all is well! If it just drops, and keeps dropping... You have a problem.

If it's not a charging issue I'd suggest you raise your idle until it does kinda run and then you could just roll with it. The proper thing to do would be to buy a single wire lawnmower tach and a D-socket for the idle mix screw on the side of the carb so that you can perform a proper idle readjustment. Hope you get some answers this time!

[michaelwoodcoc]

when you get it running rev it up then cover the air filter hole, it'll suck anything that may be clogging the carburetor out. Works good sometimes. Does sound like a charging issue or loose battery terminal though

[farmhand504]

Where is the idle mix screw on the side of the carb? I removed what I thought was the welch plug to look for the screw, but it there wasn't a screw/needle. I'm not sure how to post how to post a pic, seems it would make it easier to explain to y'all. I'll try covering the air intake and see if that helps.

Thank you both!

[vagent]

Try using a finger to block the air intake in the air intake housing. It's just like "in the old days" when you manually choked the carb. It will start, then run rich because of the excess fuel, then remove your finger for a second or two and it will start to falter, so put you finger back. Shortly it will warm up enough to run. If this works, one would think it points to the automatic choke and/or the idle jet. However, I've made sure they are not clogged or maladjusted and the problem still persists. Go figure.