johnson 140 saga continues

[spareparts]

compression test before you do anything, then pull the heads is youve been challenged

[phatdaddy]

are u running premix or using the injection system? not sure on that motor, but if injecting, should hear a horn on precrank (southern word).

[thebottomfish]

I am running premix, previous owner disconnected vro system. I will try grounding the warning horn as well as the compression test this afternoon and I guess I'll proceed from there.
This may seem stupid, but every time I've compression tested I've done it cold, with water running and warm with water running just because the muffs we're going to be on there sooner or later...since I won't be running the motor for this test do I still need to hook it up to muffs?

[phatdaddy]

if u melted t-stats, pump is probably gone also, but it won't hurt to hook up hose.

[smokeonthewater]

Water optional... You WILL be replacing the impeller RIGHT.. Just go ahead and pull the LU off.

Compression test done at wot with ign disabled.

[bradford]

I'd leave the lower unit on until you do the compression test.

No immediate need to get the lower unit off if it has bad compression.

[thebottomfish]

Yes I already have the water pump, thermostats, house barb nipples on order, today will determine if I'm getting head gasket as well.
Doing a compression test with the thermostat housing off the block should not effect anything correct? I know it's only 8 bolts but I don't feel the need to put them on to do the test.
Correct me if I'm wrong?