Can't find any information on the correct spark plug used for a 1988 50 hp force.

[wildman_wilds]

Need help very badly. I have a 1988 50hp force 507y8d and it doesnt have the surface gap style spark plug and im hearing that the spark im using can burn a hole in the piston. Can some tell me the part number or the correct surface gap plug needed i think its a prestine ign. Im not certain. Some one please help me.

[roscoe]

1988-1991 50 hp Force used an NGK BUHX or a Champion UL18V





http://sparkplugs.com/results_appOth...=217412&mfid=1

[jerryjerry05]

Came stock with L-82C With the electrode sticking out.
You have Prestolite Ignition.Use what the factory calls for.
Some people substitute the permagap plugs.They come stock on the bigger 85/125 motors.
The wrong (HOTTER)plug along with too lean a setting on the carb might melt a hole but not likley.

There is no way the right plug is gonna hurt the piston.
Some plugs are longer and can(maybe)hit the piston.
Again not likley.

[carholme]

Here is the parts list for your 507y8d

http://www.crowleymarine.com/mercury-outboard/1272.cfm

See the plug, item 21 (NGK B6HS @4) under CYLINDER BLOCK, HEAD AND EXHAUST CHEST COVER


Gerry

[catfishcarl99]

1988-1991 50 hp Force used an NGK BUHX or a Champion UL18V





http://sparkplugs.com/results_appOth...=217412&mfid=1

ya i have a 89 50 507y9b. it calls for ul18v l78v or the buhx

[carholme]

Catfish:

A 507y9b is not a 507y8d

Gerry

[catfishcarl99]

thought they might be close or give him a place to start. this is correct plug.

SPARK PLUG, L-82-C
(NGK #B-6HS)
http://www.**********/parts/search/M...VER/parts.html