SOURCE: Ryobi 2800R 28CC Weed Wacker questions
Most likely it does not have a clutch which is common on cheap curved shaft trommers. The only cause for smoke in a 2 cycle engine is the oil you put in the gas.
There are two major differences in 2-cycle engines. There are water cooled and there
are air cooled engines and the oils are entirely different. Water cooled (outboard) engines run at much lower temperatures and at much lower RPM's. It is necessary for outboard oils to burn during the combustion cycle. In this situation the oil turns to smoke so that the oil is not deposited in or on the water. Air cooled engines run at a much higher temperature and must not be used with outboard oils. In an air cooled engine the oil should leave the muffler in liquid form. If the oil turns to smoke it is not able to lubricate the engine and a very undesirable carbon deposit is left behind leading to engine failure or stuck piston rings.
Since a top quality mixing oil will cost $12 or more for a six pack (that comes out to well over $100 a gallon of oil) there is little wonder that so many companies want a piece of that pie. Cheap oils no bargain even if it is free. If the oil says it is for outboards, lawn mowers, string trimmers, and chain saws, they are telling you that they know nothing about 2 cycle engines and only want to take your money.You should choose an oil whose brand is that of an engine manufacturer. Obviously these companies are not in the oil business but they want to make sure that they do not cause warranty claims from an inferior oil. The life of you engine is dependent on choosing a good grade of oil. You should pick an oil that you trust and that you can purchase on a consistent basis. Unlike gasoline, oil does not deteriorate with age. It is better to buy enough to last you a year or two than it is to change brands every time you run out.
The l0ud muffler probably can not be helped unless the muffler is rotted and needs replacing.
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SOURCE: ryobi 2800r gas trimmer how to adjust carb mixture?
The are limiter caps and can be removed. Just pop them off and you'll see screws under them (put a small screwdriver around the bottom of cap and push upward and they'll come off).
SOURCE: Ryobi trimmer not spinning
Either the cintrifugal clutch is not engaging(if that model has one). Or the drive cable is snaped, or the rotary head drive lug is stripped. Pull off the drive head(where the nylon cord goes) & behind it is a flexable cable that transmits drive from the motor to the drive head(bobbin).pull it out and see if its broken.Check The rotary drive head lug,its on the top of the drive head (bobbin) you removed.
hope this helps
Regards Andrew Porrelli
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