250 Pro XB spark plugs

[dkwestern]

What plugs do you run in your 250 Pro XB, what plugs are stock?

[Massbasser]

I run QL77cc's availible at NAPA for 16 bucks for 6, no problems so far.

[150aintenuff]

I believe stock were either NGK BR8HS or champion QL77CC.. champion do wek fer soe people But I dont have any lick with them.. I use NGK myself..

I pay 12-14 bucks fer BR8hs set if that is what infact came stock..

[dkwestern]

Thanks guys, can anybody certify the stock plugs as the champions? I am buying these for my dad, and can't get to the engine to see what is in it.

Is there a guide somewhere of all of mercs spark plugs? I use NGK's in my 3 outboards, but he likes to stick to stock stuff, unless someone can convince me to switch his otherwise. Thanks,

[150aintenuff]

I think Merc parts express shows the OEM part but could be wrong....

[merctech5591]

250xb plugs



you should only use champion plugs ql77cc. on certain motors we have seen interferance with the electrical system using the ngk plug.

[Richard Shaling]

Work at a Merc dealer.Called Mercury Racing and the say the best plug for a 225EFI, 250XB, and 300 Pro Max is the Champion QL77CC.Mercury does not mention a NGK plug for these motors.
Richard

[150aintenuff]

varry well could be the problem with the NGK plugs is the fact that there is no direct cross and the NGK plugs have a different resister than ideal.. if stock was Champion then use that..

I personally have never had any good luck with champion plugs in ANYTHING weather it be a lawn mower, car, or boat.. so I try to avoid thm... could be more a factor of where I am located or where I buy more so than any manufacture difference though..

[dkwestern]

Thanks guys, Champion QL77CC it is!!