help 80 sportfire

[bernie7434]

So I was riding along yesterday at a full clip on a warmed up 80 sportfire when engine died. Thought the worse but engine still turns over haven't had a chance to borrow a compression tester but feels the same on the rope. Won't run on ether I do have spark. Could I have jumped time how do I check. Anyone with similar problems. Crank seals are old and I know I need to swap them out.

[smitfire]

If you think the crank seals needed to be done, do it now. It's prolly already too late

[johnnycyclone]

I would check the compression before going any further. I had a Spitfire quit running after an overheating issue, it was my boys first time on a sled and he just putted around the field with it. Sounds about what you experienced, it was running just fine, then quit, couldn't get it to run again, checked compression, didn't have much on either cylinder. The engine was just rebuilt, with new seals, pistons and rings, before it melted down.

Terre

[Matt]

Before you get the compression tester, you can shine a flashlight in the plug hole and see if you can see a hole in a piston.

[bernie7434]

Couldn't see anythingwith a flashlight so pulled the head huh no gasket should there be. One piston black as sin other clean aluminum no holes on nicks anyone know off top of there head torque specs.

[Matt]

You can find the tech manual on www.vintagesnow.com.