What kind of spark plug?

[kmroach]

What kind of spark plug for a 5.5 hp eska, model # 21759431?

I looked on the sparkplugs.com site and find it to be Champion RJ14YC

But the spark plug I pulled out was a champion L87YC

Which one is right? and if the L87YC is the wrong plug would that cause it not to start?

 

[mrcrabs]

Re: What kind of spark plug?

RJ14YC is right, don't know about the other plug....if you find a RJ12YC thats a little hotter plug and works great as well....I use them on heavier oil mix ratios

 

[kmroach]

Re: What kind of spark plug?

thanks again mrcrabs...I picked up a RJ14YC last night and am gonna give it a shot today sometime. The RJ14YC has about half as many threads as the incorrect spark plug that was in there. So I am thinking this could be part of the issue, combined with the fact that the spark plug was dirty.

 

[Tommy Two Stroke]

Re: What kind of spark plug?

RJ14YC is right, don't know about the other plug....if you find a RJ12YC thats a little hotter plug and works great as well....I use them on heavier oil mix ratios

Mrcrabs, I believe you have it backwards. With Champion spark plugs, typically the higher the number, the hotter the plug. An RJ14YC should be hotter than an RJ12YC.

 

[mrcrabs]

Re: What kind of spark plug?

I stand corrected T2S, NKG's goes smaller number the hotter, however RJ12YC seem to give me a bit of performance gain and are usally dry when pulled compaired to the RJ14YC