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QUESTION FOR JOE R

G

Gary G

Guest
" Joe....What is the differanc

" Joe....What is the differance between a QL77JC4 and a UL77V other than the electrode...I took your advice on my 1974 70hp Evinrude and used QL77JC4'S and it seemed to run better with the UL77V plugs, at lower speeds.
Gary "
 
"Gary..... The "Q" ind

"Gary..... The "Q" indicates a suppressor plug which is designed to help quiet noise/static/interference in any electronic equipment you might have installed. The "77" indicate the heat range. The "C" indicates a copper electrode for long life.

Strange.... the QL77JC4 plugs should have the engine running better at all speeds. I'm assuming that you did set the plug gap to .040 .

Joe
"
 
" Yes I did...I know what all

" Yes I did...I know what all the numbers and letters mean. I'm not really interested in a suppressor plug, my boat has no electronics. I know the UL77V cost more but are the UL77V plugs supposed to be better performing. What is the advantage, if any, in using them ???
Gary "
 
The UL77V plugs really have n

The UL77V plugs really have no heat range to speak of regardless of the 77 rating. They last just about forever but are prone to fouling at low rpms.
 
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