70HP JOHNSON OUTBOARD doesn't want to run with cowl on.

You need to take off the carborator clean take apart clean with carb cleaner and put it back together good to go make sure the fuel line has no hole

Check the ignition system, check for spark at the plug, if it has no spark check your points, ignition coil, etc. If it has spark you need to check the fuel system so that's gonna boil down to an obstructed fuel line, a clogged fuel filler, or something in the carburetor(s). That should lead you to figuring it out my friend, best of luck. It's always either air, fuel, or spark! If one or more of the 3 are missing it'll never run(not right if it does), those basics always apply to an internal combustion engine of any age or size, whether carbureted or fuel injected. Thanks and Best of Luck

Douglas, Outboard appears to be 1988, 70 HP. Check the attached links,instruction and guides, Good luck
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Find 1988 Evinrude E70TLCCA 70hp Outboard Motor Parts by Engine Section
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Can't find any free ones but there is one for sale on e-bay right now. Repair manual for 3 Cyl 1988 70Hp Johnson outboard

check fuel filter, an for vacuum leaks at carb

Generally on most two stroke outboard engines you have to choke the engine every time you start it. Also let it warm up for awhile before heading out. Johnson/ Evinrude are known for this.

Little Johnson outboards are famous for being very easy to start, So- first pump up the gas, then set the throttle open to the neutral stop -pull thru once -then set the choke to fully closed (look down the carb and see if it is) and pull thru 2 more times- open the choke. try again --If it is not running by now you have a bad ignition, or the engine has no compression. - very likely if you are running the wrong spark plugs. You may have some shattered reed valves.

See if the spark plugs are getting wet with fuel.

Take the cowling off. Also drop the foot. There wil be a stainless linkage rod that runs the length of the motor that you will have undo to drop the foot. The water impeller will be inside a stainless casing that you will have to disassemble.

u have no spark in #2 cyl check for spark with plug if its week regap it