1979 140 JOHNSON L77JC4 PLUG GAP

[billboyd37]

ANY IDEA WHAT SPARK PLUGS SHOU

ANY IDEA WHAT SPARK PLUGS SHOULD BE GAPPED AT

 

[david_r]

"list here that its .030

[u

"list here that its .030

http://continuouswave.com/whaler/reference/BRP/SparkPlugChart2008.pdf

but it seems ive also read .040 will do........depending on your boating situation and needs"

 

[vics]

"The currently recommended plu

"The currently recommended plugs are UL77V or L16V according to Boatsetup.com.
UL77V were the originally recommended plugs for sustained high speed operation
They are surface gap plugs.

For low speed operation the original alternative was L77J4 for which you would now substitute L77JC4, but the inductive resistor version QL77JC4 is a better choice for electronic ignition systems. These would be gapped at 0.030"

btw, there is there is no need to SHOUT"

 

[david_r]

vics could you resend/repost t

vics could you resend/repost that write up about the spark plug heat ranges please? it makes for a good read for people with this question.....

my old comp crashed and i no longer have the link and im trying to get all my info and favs back.

i would really appreciate it.

thanks.

 

[vics]

"I think that must have been

"I think that must have been http://www.spark-plugs.co.uk/pages/technical/spark_plugs_technical.htm

There are a number or articles on http://members.iinet.net.au/~pauldawson/index.html that you might find interesting reading."

 

[david_r]

thanks for the info vics ill c

thanks for the info vics ill check them out.

im an auto mech and still a little green on obs but i love to learn about engs

the link i had before came off of a "see here" type link that you gave me before and i went back to my old thread and it wouldnt connect to it for some reason.

thanks again

 

[david_r]

yep on the members.iinet under

yep on the members.iinet under "why do obboard motors use special spark plugs"

thanks again!