Early 90's 60 Evinrude tiller

[timguy]

Reviewing ancient writings of Racer. Working on this motor has me baffled, can't get it to idle smoothly, it backfires and stumbles. Timing light shows steady spark with no fluctuating. 3 cylinder. ID tag worn off, but boat looks original, owner said is titled as 1994. Rebuilt carbs, changed head gasket, compression 110, little lower on upper cylinder. Top carb had wrong main jet....#34. Replaced with #45? Can't figure out how this happened, also all 3 floats were installed upside down. Original stator and original trigger but brand new CDI power pack. New non oxy dispensed direct with 6 gallon tank. New spark plugs. Tested trigger and stator with CDI tech live over the phone. Degreed and confirmed timing and tdc on flywheel. Tried another brand new CDI power pack yesterday. Same problem. Been at this outboard repair for 57 years, this is puzzling. No Alzheimer's yet. Any suggestions?

 

[timguy]

Here is carb jet info. Sorry had #35. Also one carb gasket was installed upside down.

 

[timguy]

Can somebody please make some suggestions for me on this motor? I am talking with the owner right now. He is trying to sell it not running. This is humiliating. Thanks.

 

[faztbullet]

Need year model . Does t sound like a gargle thu carbs if you try to rev it up ?

 

[timguy]

No it doesn't. Owner says it's 94, but ID tag is damaged. Something was rubbing on it there, can't read it. Is there another way to find the year? Thanks, my friend. Tim

 

[faztbullet]

If it has the bridged exhaust port it highly likely the pistons are scuffed on exhaust side. Cylinder wall will look fine

 

[timguy]

So that will cause the stumbling and misfiring? Yes the walls looked fine. How are these compression readings? 105, 112, 112?

 

[timguy]

Leak down test passed but that was piston about 3/8" to 1/2" down from top.

 

[faztbullet]

Got a borescope?

 

[timguy]

I have a small camera to fit inside. But I had the head off already anyway. Looked pretty decent.

 

[timguy]

Question: What's mint mint 90 1986 "Tower" worth? I mean MINT. All new CDI electronics and tuned up by yours truly. Never used ethanol, stored inside. Guy has a big trucking company, can deliver. Controls for pontoon 24' long Base/clear finish, applied by his body shop. Thanks, Tim

 

[faztbullet]

Fish scope past bridge an look at exhaust side of piston...

 

[timguy]

Okay, Pappy.... Then you think the upper cylinder might have some piston damage which will not show up as scoring on the upper part of the cylinder? The. #34 main jet....not knowing how long it was there, would have likely caused the damage? Thanks.