300/440/550 spark plug question

[SkiDiggity]

JS 550 BR8ES?

correct me if i am wrong please.

Thanks,
shane

 

[big bryan]

Correct

 

[nitrodude81r]

I run BR9ES and have no problems also

 

[jetski9010]

8's in cold water and run 9's in the summer when its warm water.