I am running a 2000 Vmax 225 EFI Yamaha. When I got the motor it had BR9HS-10 NGK plugs in it. My dealer says the book calls for BR8HS-10. What is the difference between the 8 and the 9? and would the 9 be better for
less fouling...Thanks
I am running a 2000 Vmax 225 EFI Yamaha. When I got the motor it had BR9HS-10 NGK plugs in it. My dealer says the book calls for BR8HS-10. What is the difference between the 8 and the 9? and would the 9 be better for
less fouling...Thanks
With NGK's the higher the number the cooler the plug. Read here for more technical info : http://www.ngksparkplugs.com/t...ry=US. Are you having plug fouling problems? I would just run whatever is on the chin cowling sticker. If you have problems try the next cooler plug. Sounds like that's what the previous owner did.
Mike
Hold My Beer And Watch This !
If your plugs dont look so hot go to a hotter plug. I went from a 7 to 6 and mine look alot better. I think Yamaha said to do this on the HPDI, which is the 6.
You can usually go one step up or down w/o problems, assuming your motor is in good shape to start with. Running a hotter plug to help fouling is a quick fix for other problems. A motor in top shape will not usually foul the recommended plug. If you are getting a lot of blow-by or over-oiling a hotter plug can help, but it's not adressing the real issue causing the fouling in the first place. It also depends on what you are doing w/ it, such as running WOT all the time or trolling around all day and the conditions you run in.
Yamaha has had trouble with the oil issue. Putting to much to the mtr. They are the ones that said to go to a hotter plug. I dont think these big mtrs like to idle around all day either. Plugs should not be wet looking and all carboned up cause if they are so is the piston and rings.
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