Are these the right spark plugs?

H

huntxtrm

Petty Officer 1st Class
Joined
Oct 10, 2007
Messages
253
I have a 70ESL-74M. Johnson. It has NGK BUHW-2 plugs in it. They look weird, and it's not running real smooth. Thinking maybe the carbs are dirty, but these plugs look strange. Motor has not ran exactly right since I've had it. Same plugs that I got it with. Compression is 105/110/90 top to bottom. Motor misses a lot. Help me fish? Please? Lol
 
Vic.S

Vic.S

Rear Admiral
Joined
May 4, 2004
Messages
4,718
Re: Are these the right spark plugs?

The original plugs were Champion UL77V
These are surface gap plugs with an auxiliary gap. Hence their unfamiliar appearance.

The nearest NGK equivalent, if you must run NGK plugs, are BUHXW-1

The X indicates the auxiliary gap ...... but I don't know the significance of the final -1 or 2)

My guess is that Champion L77JC4 or QL77JC4 ( gapped at 0.030") as fitted in later years would be suitable conventional plugs ( NGK eqivs B7HS-10 or BZ7HS-10)
 
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H

huntxtrm

Petty Officer 1st Class
Joined
Oct 10, 2007
Messages
253
Re: Are these the right spark plugs?

These plugs, I have don't have an electrode to gap? And no, I'm not married to NGK, I've actually always preferred champion, in my other vehicles. So I should use the second champion number, you mentioned?
 
D

Daviet

Fleet Admiral
Joined
Sep 24, 2008
Messages
8,958
Re: Are these the right spark plugs?

I would use the champion plugs, L77JC4 or QL77JC4.
 
H

huntxtrm

Petty Officer 1st Class
Joined
Oct 10, 2007
Messages
253
Re: Are these the right spark plugs?

Done! Thanks guys, I'll let you know if it fixes the problem
 
H

huntxtrm

Petty Officer 1st Class
Joined
Oct 10, 2007
Messages
253
Re: Are these the right spark plugs?

Gotem, fixin to gap em and install em. I'll fire it up in the morning and check it out. Thanks
 
H

huntxtrm

Petty Officer 1st Class
Joined
Oct 10, 2007
Messages
253
Re: Are these the right spark plugs?

Fired it up. Runs better that it ever has. Still a slight miss. But, that might be a compression problem. I'll be looking into how to correct that. Thanks for the good info on the plugs. I really appreciate it. I might just go fishing tonight!
 
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