spark plug fitment

[matt glascock]

Hi Everyone, here's the scoop. After a new top end install and oil injection system repair on a '75 Toad, I was running 32:1 premix during break-in period and to confirm proper injection operation. After run-in, I changed the plug (NGK B8HS) and have been running straight 92 octane nonoxygenated pump gas. It ran "too well" suggesting a lean condition. Leak-down test confirmed leak at the spark plug. I used the old stand by "finger tight + quarter turn" method on the install. After the leak down test, I applied the wrist torque wrench which properly seated the plug thus ending the air leak and restoring proper engine operation. The question at hand is: what is the best, safest way to install a spark plug to insure proper seating without overdoing it and compromising the function of the spark plug gasket? As always, thanks to all!

Best,

Matt

[thrownchain]

I just snug it down with a plug socket on a 3/8 drive handle. No need to do any more than that, just snug.

[viclioce]

I do it the same as Thrownchain Matt. As little big as its wrist tight, that's good. Just don't repeatedly overtighten and flatten out the washer. If you do, just change the plug again. ; D Victor

[matt glascock]

Good call. Thanks fellas!

Best,

Matt