Shetland 535 Fishing/day Boat. Main Engine Not Working.

This is a modified Shetland 535. Adapted to make a nice fishing boat with lots of space.I have owned it for 10 years and modified it 7 years ago. The cabin has been removed and made into a cuddy and a deck added. Anti-slip surface on main deck and top of hull.The main engine a Johnson 65hp (DOES NOT RUN). I have replaced the power pack coils leads plugs.
(Please don’t ask what’s wrong. If I knew that I would fix it.)The auxiliary is an Evinrude 5Hp 2 stroke starts and runs well.The boat has a 110amp leisure battery and a separate 12v battery to start the engine. A solar panel keeps them both topped up. Recently replaced switch panel, nav lights and interior lights. IncludesGarmin 500C fish finderGarmin 60CS hand held GPS marine maps loaded.west Marine dsc vhf radio.Small anchor and rope, boat hook and fuel tanksTrailer good condition, new tyres and wheels 2 years ago, bearings greased last year, ( not braked) I am getting a bigger boat so selling my Shetland as is.
I have tried to show all I can in the photos. It was on the water until last month. I have cleaned the bottom so the hull can be inspected.