newest sled need opinion

[booblover]

Tore into my newest 81 invader 440 today. Recently picked it up because it was so clean. I was told it ran great but didn't want to take a chance on crank seals. Upon disassembly, I noticed some light scoring on the stator side piston. Wasn't terribly concerned because that side had 145 psi. (Clutch side has almost 155) When I pulled the flywheel and the coils off, the crank seal looked like it was brand new. Do not know the history of the sled but I am guessing someone had an issue with it and replaced the seal. Should I just do a leakdown test on the case?  The seal looks perfect. What is the best way to do a pressure test on the engine.
Another question I have is about the clutch side cylinder. The aluminum looks very white and clean, almost like it has been run lean. That cylinder has about 155 psi and the piston and cylinder walls look perfect. Any comments?

[jimvw57]

If you have it apart, put new seals in.  If the cylinders have that much compression, I would have left them together.

Button it up and do a few test runs and watch the spark plugs. Adjust the carbs accordingly.

[booblover]

Just got my seals and im pretty sure they are not the right ones. Now im really thinking about leaving the existing seals in. Every time ive done seals on my invader I have bought the whole gasket kit for an 81 invader and not had any issues. I got them individually and I think I screwed up.

Any thoughts on the white cylinder?

Thanks Mark for that windshield going to look awesome. Ill post pics when im done.

[booblover]

Just hit 63 degrees and all the snow is just about gone, so I have ordered all the correct parts, and I am going to be responsible about the seals and just change them. At this point all I really have a question about is my white jug. Cylinder wall looks perfect, piston looks perfect (viewed from spark plug hole and exhaust port), compression is high, oil pump seems to work fine. Anyone?

[gixxer6]

Is it the outside of the cylinder that is white?  Or the inside???

[booblover]

Outside of the jug. Maybe im just crazy. Maybe its just cleaner than im used to seeing a 30+ year old engine.

[Lloyd (ljm)]

 My guess would be someone has cleaned it at sometime.

 The only thing I would worry about is how to keep it that clean. 

 lloyd
 

[gixxer6]

Lloyd is correct.  Someone either cleaned it or replaced it.  There should be nothing to worry about.   

[booblover]

Pic

[Mad Kaw]

Outside of the jug. Maybe im just crazy. Maybe its just cleaner than im used to seeing a 30+ year old engine.

im gonna say its the sam adams 

[booblover]

Got it all back together after three days of cleaning and assembly.  Pulled it over and its only running on the clutch side cylinder. Switched the plug wires and still only clutch side ran. Checked compression and fuel. Both good. Plug sparks on flywheel side when I pull it out and pull it over. Similar thing happened with my first invader before I changed the seals. New seals fixed it but ive already done seals. While it runs, both carbs are sucking the same. Im tired and stumped. Any ideas?

[mswyka]

I have had spark coils that sparked with the plugs outside of the cylinder but would not light a plug inside the cylinder.  Do you have a working spark coil that you can swap in?

[Lloyd (ljm)]

  Like Mark with his coil sugestion. I have seen plugs do that. They would spartk fine outside but under pressure they would not.

 Have you tried different plugs?

 Lloyd

[booblover]

I did try new plugs. I have a brand new coil on my other sled that I will try. Im going to swap carbs too to see if the problem follows it.

[jimvw57]

Carbs shouldn't affect the spark.. I have had brand new sparkplugs not work right.

If you mean won't run on one side, maybe check carb boots or primer for air leaks??

Maybe a seal tore after the install. I have seen that happen too