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EVENRUDE SPARK PLUGS

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Gary G

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" I have a 1974 ER, 3cyl,70hp

" I have a 1974 ER, 3cyl,70hp OB. Would their be any advantage of disadvantage in using a marine UL77V vs the recommended L77J4. "
 
The UL77V has no heat range t

The UL77V has no heat range to speak of and is quite prone to fouling. I wouldn't recommend using it in that engine. The Champion L77JC4 or QL77JC4 with the gap set to .040 is the plug to use.

Joe (30+ Years With OMC)
 
" My Evinrude 40hp outboard pi

" My Evinrude 40hp outboard picked up an old piece of fishnet around the prop. In doing so, the trim tab was moved to one side. The trim tab is part #332475 stamped on it. It has 0 through 6 setting marks on it. I set it on 4, (trial & error) and it steers ok but not perfect. Is there a default setting or is it different for each motor? Thanks for any help. "
 
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