B7hs

[SharkB8]

Would there be any problem running a B7HS plug in a 61x with a high compression head and coffman pipe.

I'm going to try to jet my ski myself, so I'll be running well on the safe side at first, and I heard that a hotter plug would probably be a good idea. But I didn't know if the hotter plug would be a problem with the higher compression head.

 

[yamanube]

What kind of head? Most aftermarket heads use an ES plug instead of an HS.

 

[SharkB8]

Its a stock head modified, milled to around 185 psi.

 

[restosud]

run a colder plug or stock heat.