Assuming it is a B+S engine, if it starts fine and runs rough and smokey as it gets warm and will not get enough speed, the problem is with the Diaphragm between the carb and fuel tank, it costs about £3 and is easy to fit if you have a 10mm and 13mm spanners and a cross heded screwdriver, ver annoying but relatively cheap and simple fix. Max.
Assuming you have a fairly clean air filter and a good spark plug, my first guess would be the gas. Make sure it's fresh. Also check the gas tank for dirt and/or water, especially if it hasn't been used for a while, and clean and/or drain the tank if you need to. If you've done all this, maybe the carb. needs adjusting.
Water in tank and bowl.....dump ALL GAS from tank and line....then gently loosen bowl screw (1/2 in. small socket) until all gas drains from bowl....gently tighten bowl screw back snugly....put new gas in....give it 2 min. to fill up bowl...prime it 5-6 times ...crank it up....p.s. might need to help it out a little with some starter fluid sprayed into carb. (3 short squirts)
Answers & Comments
Assuming it is a B+S engine, if it starts fine and runs rough and smokey as it gets warm and will not get enough speed, the problem is with the Diaphragm between the carb and fuel tank, it costs about £3 and is easy to fit if you have a 10mm and 13mm spanners and a cross heded screwdriver, ver annoying but relatively cheap and simple fix. Max.
Assuming you have a fairly clean air filter and a good spark plug, my first guess would be the gas. Make sure it's fresh. Also check the gas tank for dirt and/or water, especially if it hasn't been used for a while, and clean and/or drain the tank if you need to. If you've done all this, maybe the carb. needs adjusting.
Water in tank and bowl.....dump ALL GAS from tank and line....then gently loosen bowl screw (1/2 in. small socket) until all gas drains from bowl....gently tighten bowl screw back snugly....put new gas in....give it 2 min. to fill up bowl...prime it 5-6 times ...crank it up....p.s. might need to help it out a little with some starter fluid sprayed into carb. (3 short squirts)