spark plug question

[tav]

i have a 1982 7.5 h.p 2 stroke, model # E8RCNR don't know what the R stands for. i bought new plugs but when i matched them up to the repair manual they are different numbers , the plugs i have in there are champion QL77JC4 and the manual calls for L7734, Iis there any differece between the two? i did use the QL# last year and there was no problem.... anyone now the gap of these plugs? can't find it in the book....thanks

 

[ezeke]

Re: spark plug question

Current recommendation is for the QL77JC4 rather than the L77J4. They share the same operational characteristics but Q plugs don't cause the radio/electrical interference that the earlier plugs did.

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

 

[Vic.S]

Re: spark plug question

The R in the middle means rope start.
The R on the end is a production code.

Currently recommended gap is 0.030"

( the Q means the plug is inductively suppressed )

 

[tav]

Re: spark plug question

thanks guys.....this site is great.