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#1
03-04-2014, 12:38 PM
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spark plug heat range
A neighbor recommended that I go to the next hotter plug than what the engine specs call for, because I am pre-mixing and my oil ratio is rich. Says it may help the engine run more efficient and keep the plugs cleaner from fouling. Do you guys agree?
Also, he recommended I switch from Champion to NGK. Engine is a 1994 Evinrude 175 HP two-stroke. I'd be glad to here anyone's opinion on plugs for this or similar engines. Thanks, Aaron 
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#2
03-04-2014, 01:00 PM
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I wouldn't switch to NGK's unless you want problems. OMC's always seem to run best on CHAMPIONS(at least for me anyways). Your engine calls for 2 different plugs depending on useage. The QL16V is a surface gap plug and is best suited for high RPM running. The QL77JC4 is a great all around plug, and is about all I use in them. Many will run QL78YC's, but I have found them to foul at idle alot, but work great in the higher RPM's.
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2011 SUNDANCE B20CCR SKIFF, 2011 YAMAHA 90HP 4 STROKE, 2011 KARAVAN SINGLE AXLE ALUMINUM TRAILER, LOWRANCE ELITE-7 HDI, MINN KOTA RIPTIDE TROLLING MOTOR 2000CC HYDRA-SPORT 225+HP EVINRUDE SOLD  AND THE PINK JEEP!!!! R.I.P. http://www.wellcraftv20.com/communit...ad.php?t=11664 
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#3
03-04-2014, 06:18 PM
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I can't answer the hotter plug question.
But the NGK vs Champion I have some experience with. I had a Yamaha IT 200 dirtbike that would foul the NGK plug EVERY cold start. Switched to Champion, never had one foul again.
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*************************************** Stay Safe!  Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke. 1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke. Last edited by randlemanboater; 03-04-2014 at 10:17 PM.
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#4
03-04-2014, 08:58 PM
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Gotta jump on the Champion bandwagon. I have had nothing but problems with NGK and fouling. Champion just seems to work better in every engine I've put them it, be it snow blowers, chain saws, outboards, or vehicles.
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1987 V20 w/1987 150HP Yamaha on a Shoreland'r Trailer 1978 16.5 Airslot w/1996 120HP Force on a Four Winns trailer 1996 V21 w/1993 200HP Mercury on a Shoreline Trailer All towed by a 5.7L Hemi Durango. If God didn't have a purpose for us we wouldn't be here, so Live simply, Love generously, Care deeply, Speak kindly. (Leave the rest to God)  Silence, in the face of evil, is itself evil. Not to speak is to speak, not to act is to act. God will not hold us guiltless.
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#5
03-04-2014, 09:28 PM
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I hate Champion plugs, years ago when I worked on cars, it was not uncommon to get two bad champion plugs out of a pack of four plugs. Since i started working on boats, I started using NGK. I have never(26 years) run across a single NGK plug that was worn out. I've seen them fouled by gas, oil, and water, but never worn out. If you ever drop a champion plug(non copper core) it usually breaks in half. I've tried to break a NGK and all they would do is break the porcelain off and bend over. Ive run back to back test with Chanpion vs NGK plugs in a 225 looper and made more power with the NGk on a K&O dyno(yes, i know they don't recommend anything but Champion due to electrical interference). Champion plugs rust quick in a salt environment compared to NGK or AC(autolights are the worst about this). Champion plugs run like crap in a 2.4/2.5 merc(run good in a 3.0L).
But even after all this, I'd have to agree that in some motors(mostly OMC) Champion seem to run better. Run the projected tip plug that Ferm recomended
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#6
03-04-2014, 10:19 PM
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Point - counterpoint.
__________________
*************************************** Stay Safe! Sold - 1984 V-20 Cuddy with a 2003 Johnson 140 hp gas sippin 4-stroke. 1995 Ranger 250C with a 2015 Suzuki 300 hp 4-stroke.
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#7
03-05-2014, 11:13 AM
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I don't know Jack Chit, but I've always run Champions in the old Johnson/Evinrude stuff like I'm told to.
I've noticed a lot of Japanese stuff runs the NGKs. I have Bosch and NGK in my 2 stroke lawn equipment and the Bosch seems to foul a lot. Never had an NGK foul.
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1985 Wellcraft V-20, Evinrude ETEC 150: SOLD 1979 Marine Trader 44, twin Ford Lehman 120s 2006 Panga 14, Tohatsu 20 Last edited by bradford; 03-05-2014 at 11:27 AM.
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#8
03-06-2014, 07:54 PM
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I just put the champions back in... The std low-cost one l77jc4. Not looking to drop $50 on plugs.
So it's pretty unanimous that going to a hotter plug is not a good idea? I mostly run at about 4000 rpm or more (running to the fishing grounds or pulling a tube with kids on it), but do a lot of idling through all the ICW no wake zones and other stuff... 10 minute idle just to get into the waterway.
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#9
03-06-2014, 09:01 PM
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do a decarb treatment(use your old plugs) then run some yamaha ring free in your tank
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#10
03-06-2014, 10:59 PM
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the hotter plug comes in IF and ONLY IF you have a fouling problem that is found NOT to be caused by mixture or timing being out of adjustment... If you run it and never have any issues then you don't need hotter pugs... ALSO I ALWAYS carry an extra set of gapped plugs and a wrench to change them when running a 2smoke
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