1969--85hp Starflite, model 85993E possible carb swap?

[68glasspar]

Are the carbs for the newer mid 70's 85hp that don't have idle/slow speed mixture screws interchangeable with earlier models? Where the carbs with fixed mixture less troublesome?

Whats the correct/recommended spark plugs for the 1969 85hp?

 

[jimmbo]

In the Mid 70 and 80s, a lot of Owners were trying to swap the Other Way. I will admit it is a Pain to Adjust 4 Idle Mixture Needles, and the Fixed Jets eliminated that, but if you boated higher than Sea Level, the Idle Mix was too Rich, and often made for a Cantankerous Motor.

 

[racerone]

Running / idling issues with your 55 year old motor ?

 

[68glasspar]

In the Mid 70 and 80s, a lot of Owners were trying to swap the Other Way. I will admit it is a Pain to Adjust 4 Idle Mixture Needles, and the Fixed Jets eliminated that, but if you boated higher than Sea Level, the Idle Mix was too Rich, and often made for a Cantankerous Motor.

Elevation here in wisconsin is under 1000ft

 

[racerone]

Go ahead and install a set of fixed jet carburetors off say a 73 to 77 model 85 HP.

 

[68glasspar]

Running / idling issues with your 55 year old motor ?

Mid range and idle are rough, WOT is very good though. I previously had a sticky timer base due me misrouting one of the points wires. And i put in new L20V spark plugs. The original manual says L19V plugs.
I will recheck compressions today.

 

[68glasspar]

Go ahead and install a set of fixed jet carburetors off say a 73 to 77 model 85 HP

Any thoughts on whats the best spark plug for this engine?

 

[racerone]

depends on the condition of the motor.----Is thermostat working properly?----What do you do with this motor / boat.

 

[68glasspar]

depends on the condition of the motor.----Is thermostat working properly?----What do you do with this motor / boat.

The high temp light has never come on, but it hasn't been run long enough on the lake without one problem or another to really know. I plan on just using it for cruising around my lake. mostly mid range or idling during no wake periods

 

[68glasspar]

Compressions are 120-120-115-118

 

[68glasspar]

depends on the condition of the motor.----Is thermostat working properly?----What do you do with this motor / boat.

Would you stick with champion plugs or ngk?

 

[jimmbo]

I'm partial to NGK. The ones that came in my 1984 115 Merc, were still in it, with about 600hrs on them when I traded it in in 1998. As for Champion, I wouldn't them even if a Gun where to my head, unless there was no other choice

 

[68glasspar]

I'm partial to NGK. The ones that came in my 1984 115 Merc, were still in it, with about 600hrs on them when I traded it in in 1998. As for Champion, I wouldn't them even if a Gun where to my head, unless there was no other choice

Thanks! I always used ngk in other 2 stroke engines. I just wasn't sure about my older evinrude.

 

[68glasspar]

Go ahead and install a set of fixed jet carburetors off say a 73 to 77 model 85 HP.

Well i got the 1977 set of carbs cleaned and installed! i had a chance to run the boat for about 30min today. It has never run this good. top end was good, mid range and idle perfect. I put NGK br7hs gapped at .030 in it. I think i need to quit fiddling with and just try to enjoy it before the cold sets in!
Thanks for the Help!!!!

 

[68glasspar]

depends on the condition of the motor.----Is thermostat working properly?----What do you do with this motor / boat.

Did Evinrude ever sell a kit to redo the thermostats? Or is it done piece meal with just the individual parts?
1969 85hp 85993E