Originally Posted by Phil18
Hi 2 stroke 7.5hp
This isn't Twitter.
Okay, so it's a Mercury 7.5hp, 2-stroke, circa mid-70s, and it fails to start, but has been serviced apparently?
First things first. The engine has fresh fuel mixed with 2-stroke oil? I'm assuming the engine has separate fuel feed, and isn't an integral tank. The tank needs vented, and check the fuel line connection 'o' ring isn't dislodged. Check the integral fuel filter on the engine if there is one and see the condition of the fuel. In addition, on the carbs, there should be a hex slot bolt under each carb fuel bowl. Undo this and allow fuel to drain, then retighten. The fuel should be clean with no contaminants? Check on the engine there isn't a fuel shut off lever.
When the engine is started, I assume by pull cord, it pulls easily, and the flywheel rotates?
Check the spark-plugs and ensure they are new, clean and dry. Also check the HT leads to the spark plugs are fitting right.
There's a chance the kill-switch is to blame. Check the wiring for this.
Lastly, check the choke operation.
Mods - any chance you can amend the OP's subject typo please... it's driving me nuts!