Engine on full revs will not idle i have clean carb and jets

Sounds to me like your not getting enough fuel change fuel filter and tak gas out of tank and clean it out a few times as the screen in the tank may be clogged also if you have an electronic fuel pump make sure it is working properly

Have the spark plugs been replaced? Have the plug wires been tested?

My money is on a partial blockage of the main jet or the passageway to it. You're having to force it to run through the idle jet by fully choking the incoming air. There's not enough gas coming in with the choke open to allow it to run.

I'm thiniking total carb disassembly, carb cleaner and an air compressor combined with a ton of patience will take care of the issue.

Depending on where exactly you are experiencing hesitation. The pilot jet will control idle and off idle transitions, from there the main jet will be responsible for fuel delivery at anything beyond 1/4 throttle openings.

Without looking at your carbs specifically my guess is that your issue would more likely be stuck slides or damaged diaphragms rather than dirty jets, so be sure to clean those and then check their operation with compressed air.

You haven't installed an aftermarket exhaust or a non-stock air filter have you? these can also cause the kind of problems you're having, and will require you set up the carb properly to be used with them.

my 50cc scooter will idle at first and rev very well but wont idle what can this be

have u checked the float hight on the carburator? also make sure ur choke curcuit i clean and free of dirt

Are you sure there clean? did you dissasemble yourself?
I had similar issue and i 1. removed carbs 2. drained float bowls 3. removed main jets
I soaked main jets in carb cleaner, then blew all passageways with carb spray, then sprayed carb spray through all passageways in the carbs, i checked all rubber diaphragms for cracks especially the float bowl ones, my main problem was old varnished , gel like fuel traces which had built up from bike being idle over winter.

Once i completed this i reassembled and the bike idled steady and also revved cleanly to 15k revs, you might also want to check your fuel filter as it can effect flow rates if clogged with old varnished fuel

The Super B carb is not as forgiving of improper jetting as the Super E model carb due to the lack of an accelerator pump. The only adjustment you have on the carb is the idle mixture screw and idle stop screw. The idle stop screw simply adjusts the idle speed of the engine. The idle mixture screw should be adjusted somewhere between 3/4 and 1 1/4 turn out from the bottom. If it is out of this range, the carb is not jetted correctly.

Through experience over the years I've found that the Super B used on a Big Twin Harley should be jetted 29.5 on the slow jet with a 70 or 72 on the main jet. If used on an Ironhead Sportster, slow jet of 26 with either a 66 or 68 main jet.

The way to tune the carb slow speed circuit is to allow the engine to warm up and adjust the idle mixture screw one turn off the bottom. Then try to rev the engine. If the engine does not rev cleanly, try coming out a half turn on the idle mixture. If it seems to help, continue until it revs cleanly. If this is the case, you slow jetting is too lean, install a richer jet and repeat the above procedure. Once you get it tuned to where the engine revs cleanly with the idle mixture screw at one turn out, you low speed jetting is correct.

The high speed jetting is not quite as simple to set as this has to be done on the road. I usually find a long uphill run to test the jetting to keep top speeds reasonable. At about 55-60 miles per hour, roll the throttle on in high gear. Feel the way the engine pulls. If it pulls good, back off on the throttle about 1/8th turn. If it pulls better, it's just slightly lean. If when you roll the throttle on, the engine starts spitting back through the carb and doesn't run well, you are way lean. Either way move upwards on your jet size one step at the time and retest.

If the bike seems sluggish and blows black smoke when you do the "roll-on", you're too rich. Install leaner jet one step at a time.

Now, most people confuse a "mid range stumble" with a carb problem. All efforts to tune this stumble out done on the carb are futile. The problem is in the exhaust system. Most bikes do not like open drag pipes for street use. They will exhibit this mid range stumble. The remedy is to put a bolt with three nuts on it on the inside of the pipe or any other means to create just a bit of backpressure on the exhaust. This usually cures the problem or at least makes it easier to live with.

Full tuning procedures can be downloaded on the S & S site. Go to "Technical" page, then "Installation instructions" to download the full paperwork that came with your Super B.

I hope this helps and Good Luck.

It would be best if the whole carburetor were soaked in carb cleaner and then blown out with compressed air. You could have a plugged up passageway in the carburetor. If you take this route and use comercially available carburetor cleaner, DO NOT put any rubber or plastic parts from your carb in the carb cleaner as it will ruin them. As for the jets, make sure you can see light through them. I usually take a strand of copper wire (like from stranded automotive electrical wire) and run it through the jets to make sure they are clean.
If this fails to correct the situation, check the engine's compression. Low compression will cause the engine to not run at low RPM. You need to see at least 140PSI of compression (throttle wide open) in order for the engine to idle. If the compression is low, adjust the valve tappet clearances. If this fails to bring the compression to a normal level, then the engine needs internal repairs.

Assuming that you have a good spark plug, and the bike starts and idles well, your problem is the main jet on your carburator clogged up. It's not letting enough gas needed for higher rpms.
You need to remove the carb, or if you take the bottom bowl off you will be able to spray some carb cleaner in there. If you pay attention, you will see the main jet in the middle , on top of the float, and you can spray it.
There's no guarantee that you will solve the problem this way. The right way is to take the carb appart and clean it thoroughly.