spark plugs for 1979 Johnson 35 hp

[PSkiffy]

Hi guys,
Looking at the parts diagrams online, the spark plugs for my 1979 35 hp Johnson are Champion L78V. These are surface gap plugs. I thought I read somehwere that these foul more than regular gapped plugs. The plugs that are in the engine now are NGK B9HS10. What plugs would you recommend?

Thanks,
Pat

 

[rico suave]

Re: spark plugs for 1979 Johnson 35 hp

Take the Champion L78V information to your local marine suppier and they'll cross reference and match it up. The last time I went to my local West Marine they provided the NGK as a replacement.

 

[wilde1j]

Re: spark plugs for 1979 Johnson 35 hp

35HP 1977 - 2000 Champion QL77JC4 gap= .030 Current BRP recommendation.

Don't rely on a car parts place for proper plug type.

 

[PSkiffy]

Re: spark plugs for 1979 Johnson 35 hp

Thanks for the input guys. A local marina that services Johnson's has the L78V's. Should I not be using them and use the QL77JC4's instead?

Thanks again.

Pat

 

[wilde1j]

Re: spark plugs for 1979 Johnson 35 hp

You're on your own with anything but the recommended plugs.