heavy-chevy
Well-known member
hey guys, havent been on in a while. boats been sitting for a while. ever since i sank it all the electrical stuff has been giving me trouble so i let it sit for a long while. anyhow, shes back in business now and i figured it was time for an upgrade so i hoped the old johnson up a bit. i guess this would make it around a 35 hp...
started by making up a manifold to adapt the flange style carb hook up to a clamp on set up. had my buddy tig it up for me at my welding class. - free
mounted her up with a piece of rubber hose i got from the home depot - $3
up sizing the fuel line was easy, they use a reducer off of the fuel pump for the oe carb. i just removed it and hooked up some 5/16" braided an line, just because i had some laying around.
next to deal with is the throttle, you can see the plastic arm that used to hook to a rod which pushes the arm on the old carb to turn the butterfly. i "modified" an old oil dipstick tube by massaging and cutting the mounting tab and bending it to turn it into the throttle cable... odd but it works.
here is where the adjustment is at, i just drilled a hole in a nut. need to get a shorter set screw, this ones just for mock up.
pretty much all finished up
compared to the stock carb, from 28 to 34mm.
i researched it and a certain year 35hp used the exact same engine as what i have but just had a bigger carb, i think its 88 or 89, i checked almost every part number on the two engines to be sure. so i think this power head can handle more revs reliably.
I'l tell you how she runs once i get it on the water, still got to jet it and tune the timing accordingly though.
started by making up a manifold to adapt the flange style carb hook up to a clamp on set up. had my buddy tig it up for me at my welding class. - free
mounted her up with a piece of rubber hose i got from the home depot - $3
up sizing the fuel line was easy, they use a reducer off of the fuel pump for the oe carb. i just removed it and hooked up some 5/16" braided an line, just because i had some laying around.
next to deal with is the throttle, you can see the plastic arm that used to hook to a rod which pushes the arm on the old carb to turn the butterfly. i "modified" an old oil dipstick tube by massaging and cutting the mounting tab and bending it to turn it into the throttle cable... odd but it works.
here is where the adjustment is at, i just drilled a hole in a nut. need to get a shorter set screw, this ones just for mock up.
pretty much all finished up
compared to the stock carb, from 28 to 34mm.
i researched it and a certain year 35hp used the exact same engine as what i have but just had a bigger carb, i think its 88 or 89, i checked almost every part number on the two engines to be sure. so i think this power head can handle more revs reliably.
I'l tell you how she runs once i get it on the water, still got to jet it and tune the timing accordingly though.