Is the new Tank specified for your engine?
The System on the 1985 may have been different.
So you have access to Yamaha's Installation Instructions for the Engine?
Primer Bulbs are designed to allow Flow through them in One Direction, and they were Initially Designed for the Higher Flow Rates...
I suspect the Manual Choke Lever was removed by a previous Owner, Why? who knows
It would have contacted the Roller#16, shown in your last Pic
Going through the Parts Books for both the 77 and 78, there were some Big Changes and some Little Changes. The Blocks are not interchangeable, Mid...
The Control will work, I actually like The older Control as the Cable Movement was straight back and forth, the later Controls moved the Cable in an Arc
I am referring to the Old Simplex/Shipmaster Control, not the Single Lever designs
What is the weight of the Boat, it must be very light to Jump out of the Hole with a 21, and 6000 rpm sounds a little high. I guess it could be Ventilating, which would account for the High Rpm.
Exactly what prop is the 21, and what Height is the Engine mounted at?
So it originally had an Inboard, and was converted to an Outboard.
Concerns:
1)As mentioned above, Engine Height, also factoring any Setback from the Transom.
2) Tachometer Accuracy.
3) Engine Condition. Have you done a Compression Test? If yes, what were the Numbers?
4) Are you operating the...
As in Booster Cables? A bit of Overkill, and a risk of lots of Sparks if they Short Out, which near Gasoline is not a Good Thing. Just use some 16 Gauge Wire to and from a 12 volt Battery.
Where I am, we only have 2 seasons, Winter and Summer. Spring and Fall are 2 week Transition Periods, so I can't call them Seasons.
Currently in a Heat wave, temps are hovering around -11C, which is about 10F, beats a week ago when it was -45F
