Seized 717 engine or driveshaft?

[Supermechanic97]

By a top end rebuild do you mean, just honing the cylinders and putting on new rings? Or do I need new pistons too? (And of course the gaskets)

And what’s y’alls favorite top end rebuild company?

 

[mikidymac]

Top end means having the cylinders bored to the next size needed to clean up any damage and iew pistons, rings adn gaskets. Bottom endo would be crankshaft and seals.

Depending on where you are lean your plugs could still be dark. Hesitation and bogging are indications of carb issues.

 

[Supermechanic97]

Top end means having the cylinders bored to the next size needed to clean up any damage and iew pistons, rings adn gaskets. Bottom endo would be crankshaft and seals.

Depending on where you are lean your plugs could still be dark. Hesitation and bogging are indications of carb issues.

See, that’s just the thing tho... the engine wasn’t bogging, hesitating, or backfiring, or popping. It sounds really great.

 

[mikidymac]

A seizure is caused by lack of fuel, lack of oil, overheating or worn out rings or a combination of all.

 

[JeremyD615]

I have a question about lean mixtures. I was told that my mixture was lean and I need a carb rebuild. But my plugs are nice and black. That doesn’t indicate a lean mixture... am I right??
Btw I’m gonna do the compression test tonight after work and I’ll report back the readings.

You can have oil foiled plugs and still be running lean. You can also run lean in a specific throttle position and not in others...

 

[Supermechanic97]

You can have oil foiled plugs and still be running lean. You can also run lean in a specific throttle position and not in others...

Haha, wow, sounds like two stroke engines are pretty fragile. I’m an Aircraft mechanic, so 4 stroke is more my thing. Lol

 

[JeremyD615]

They aren’t that fragile as long as the fuel system is in tip top shape! You’ll be just fine with them if you’re an A&P!

 

[Supermechanic97]

They aren’t that fragile as long as the fuel system is in tip top shape! You’ll be just fine with them if you’re an A&P!

Thanks man, just graduated this last August. So I did a compression reading. seems pretty good, 145 in both cylinders. I ordered a carb rebuild kit, fuel filter, new little oil lines that run from the pump to the carb and crank case

 

[Supermechanic97]

Thanks man, just graduated this last August. So I did a compression reading. seems pretty good, 145 in both cylinders. I ordered a carb rebuild kit, fuel filter, new little oil lines that run from the pump to the carb and crank case

Also got an oil filter

 

[Supermechanic97]

I put a little bit of oil in each cylinder then started it up for a few seconds and idled; it ran beautifully

 

[Supermechanic97]

Oh, and yeah… Something is definitely wrong with my dess post and/or lanyards. I have to push really hard on the lanyard for the starter to engage and to keep the engine running... if I let off any pressure on the lanyard, it dies