I would recommend that you go to a store -- with a digital camera and notepad -- that sells this product and has a display of it fully assembled, and take pictures and note on the throttle assembly.
As to the gentleman who did not receive a response on his rating -- I'd like you to know that I certainly appreciate your expertise and time taken to help others out. People like you inspire people like me to try to help others. A lot of people go through life never leaving behind anything of good or value to others -- but you can know that you have. Personally I feel a reward in that.
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Could be one of two common problems. Fuel hose in tank is old, broken, or leaking air. The other is debris in port on carb. Sometimes carb cleaner gets it but really should get a carb rebuild kit, very cheap, an replace tank hose too. Easy job just remember where you took each part from an in a clean place an dont use paper towels, lent.
What you will need to be taking apart is the carburetor. Old, dried up fuel ruins the delicate diaphragms inside these 2 stroke carbs. Ethanol is no help to their condition either. You will need to remove it, disassemble it, and clean it. Use NO harsh carb cleaner sprays, or high pressure air on it (except the exterior to maybe clean oil and grease off). You will see a manufacturer name on one of the metal plates screwed onto the carb body. They make and sell rebuild kits and gasket and diaphragm kits so you can restore the functionality to the carb. Only clean it with a lubricant like WD-40. Harsh cleaners can swell the delicate check valves in the carburetor. I will send you this link to study what they are all about. Any questions, come back...a gasket and diaphragm kit is very easy to install...you don't have to take the thing completely apart and for about 5 to 8 dollars you can maybe get it running again. Never let old fuel set in these machines, burn it all up before storing...Never use fuel older than 30 days in them..always add Stabil or Startron additives to your 2 stroke fuel mix. Post back, we are always will to help. I would have told you the G & D kit you need, but I need the manufacturer (probably Zama) and model number off of the carburetor. If you do decide to remove the carb, be careful as there are gaskets between it and the engine. You can get those too if you damage the old one's when removing the carb.
I suggest change your filter in the tank if you haven't already then make sure you have a good spark plug , then try it again, try running w/choke part way on and see if it helps , if it does you need to clean your carb and don'tnt forget to check all fuel lines for cracks or broken,while you have carb apart don't forgrt to pull fuel inlet screen and back flush it and put it back in and also pull the needle and seat out and clean the orfice where needle goes and put back together, then if you still have the same problrm I would make sure your exhaust port is clean then you can adj your carb...there is only 1 setting on that carb, you have to pick the plastic(white) out and then the screw is under that just above where carb & diaphram split. Good Luck!!!
Your carb probably has 3 screws that can be adjusted. The one against the throttle shaft plate is the IDLE speed screw, probably Philips head. Turning it in opens the throttle settings, backing it out, does the opposite. No real concern here. But, the other 2 screws are: the L and H mixture screws. Typically, the heads of these 2 screws are of an unconventional design to prohibit tampering by the end-user (you). I use a small, plastic automotive wire connector tapped down onto the heads of these screws to get ahold of them to turn. Try it. In the case of your machine dying out upon acceleration, providing it is back together properly and adjusted correctly (see link included for tuning), you will need to try turning the L mixture screw counterclockwise about 1/8 to 1/4 of a turn, because at WOT (wide open throttle) the carb utilizes the fuel in the L (idle) circuit of the carb alongwith the fuel being provide by the H (High Speed) fuel circuit. http://www.zamacarb.com/tipspage.html
The diaphragm is in the carburetor of the unit.Drain the fuel, remove the filter cover and then the screws that hold the other half of the filter housing this should separate the housing from the carb. disconnect the throttle linkage and fuel lines.(make notes on how the linkage is connected) turn the carb over and there will be a plate with a hole in it.This is where the diaphragm is housed,remove the four screws and carefully remove cover.Install new diaphragm and assemble in reverse order.
if your unit has an air vane governer this may be stuck or damaged. If you have this type of governer it will be above the fly wheel.Requires removing front cover. Also check the linkage between governer and carb. make sure it moves freely.