How do you turn a 6hp boat motor to a 8hp motor on a Johnson 1993

On the under side of the tiller arm there is a tension screw ... make sure it isn't too tight. It is simply a screw that threads through the casing of the tiller arm and friction rubs against the inside shaft. Corrosion or an incorrect adjustment may case it to be hard to turn. I always back mine off.... If I fall off the boat I don't want the bug ger coming bk looking for me at full throttle. Next would be to give the disassembled arm a good cleaning and greasing. It is very simple consisting of meshing sprockets hooked to a long rod.

1993 Johnson J150GLETG 150hp Outboard Motor

Find 1993 Johnson J150GLETG 150hp Outboard Motor Parts by Engine Section

outboard motor manufacturers supply a long shaft leg for just this problem
Talk with your Johnson dealer and check used outboards on e bay
Lowering the whole motor may affect the boat and floatation aspects besides making it harder to steer and start

Some models charged through a Magneto, but see if you can find the 1979 Year Manual. I have a 1979 engine myself in a 15Hp which is a Manual start(no battery) and I have a Sailhorse Johnson 8HP which has an electric port and is Manual start. I believe the 8HP would charge a battery as on a Sailboat the running lights needed power. The 8HP could power the lights directly.

Johnson offered options for electric start in lower HP units and options in charging systems to contain costs. You might get a better answer from someone by listing the HP of your motor. I was the original owner of the 15HP and remember the 9.9HP and others in the same Sales brochure. The Sales brochure may advertise more about the charging systems.

I Sujest You Clean The Carbs Again ,Standing For One Year Often
Leaves The Carbs Dry And Full Of Deposits
Cheers
Gordon

Here is where you can get a service manual, they have a lot of info you might need...

Johnson Evinrude Manuals 1917 2007

look at a manuel i think it is automatic in the switch no manuei adjustment get it timming through the cd like some of the mercks

go to an auto parts store and get a can of gasoline additive called seafoam. Read the label so you know how much to add to your 6 gallon tank. This stuff works wonders on outboard motors.