78 Johnson Outboard Adjustments question

First time poster alert! just so you know,

I have a 1978 85hp Johnson Outboard. I am looking for info on how to adjust or tighten the warm up lever on the control box and if the knob just above the key is an idle adjustment?

Also wondering if anyone has any ideas on a back spray problem while at full throttle, I have it mounted on a 16' 1972 Starcraft fiberglass closed hull. this was not the original motor it had a blown 85 merc that I removed. I had the marina mount the Johnson with a CMC Poweer Tilt and trim unit a 6" set back. At full throttle the spray comming up around both sides of the motor is crazy. I have read that it's due to the motor being mounted to low and the cav plate is not aligned with the bottom of the hull.

If I try and have it raised it will require another set of holes in the transom. That would make 3 sets of mounting holes and my concern is it will weaken it to much. I also cant afford a jack plate... am I screwed or does anyone know any tricks? sorry for such a long post any help or advice would be great. Thanks

Re: 78 Johnson Outboard Adjustments question

Those holes are supposed to be epoxy filled, or you'll be re-doing the transom.

Did you buy the wrong length motor ?

Post some pics if you can.

to play with the motor , I would just get the factory service book, forget the aftermkt selocs etc.
www.outboardbooks.com

Re: 78 Johnson Outboard Adjustments question

Thanks for your response, I be heading up to work on it this weekend so will post some pics soon.

Cheers