1975 85hp sparkplugs

[natedawg]

just need to know what you guys think is the best plugs to put in it. right now it has 2 champion and 2 bosch.......bought it that way. it iis on a 1973 crestliner 16'. anythoughts on how fast?...

 

[ezeke]

Re: 1975 85hp sparkplugs

Personally, I would use Champion QL77JC4. They work best for all around use.

http://www.boatsetup.com/SparkPlugChart.html

Check here for your model boat and let us know how much it is supposed to weigh. If the flotation is dry it should still be close to spec.

http://www.iboats.com/Crestliner_Boats/bp/20br1130

 

[Nighthawk]

Re: 1975 85hp sparkplugs

Champions were the oem brand of choice L77JC4 is the correct plug , gapped to .030. Champion 5828 gapped at .030 is a replacement for that plug.
I personally like NGK plugs and the B7HS-10 is a replacement for the Champion .

 

[ezeke]

Re: 1975 85hp sparkplugs

Actually, the QL77JC4 plug is better for use around electronic components because of the improved design over the L77JC4. The two plugs are essentially the same design and specifications except for the static problem.

I suspect that is why OMC only shows QL77JC4 in the parts manuals for more recent 85HP crossflow engines.

I doubt it would matter if you don't use radios or fishfinders or transponders or OIS, etc.

 

[natedawg]

Re: 1975 85hp sparkplugs

cool thanks for the info will be checking out that sight thanks to all

 

[natedawg]

Re: 1975 85hp sparkplugs

it is about 1000lbs dry and the floatation is dry....it is rated for 115hp so what do you think on max speed.....

 

[ezeke]

Re: 1975 85hp sparkplugs

Put the horsepower in at 78 or 80:

http://continuouswave.com/cgi-bin/crouchcalc.pl

8)

 

[natedawg]

Re: 1975 85hp sparkplugs

wow thats a pretty cool calc. sight should do pretty good then...thanks ezeke!