B7HS vs B8HV spark plug ?

[fals3illusion]

whats the difference between the 701 SJ's B7HS,

and B8HV?

one of the stealership guys told me that the B8HV's were more "high performance" for more modified engines.

so i picked up 2 plugs and thought i would try them.

is this true or should i not even try to run them because they will mess up my engine?

Thanks!

 

[SUPERTUNE]

The B7HS is the stock plug in the early 650/701, I cant remember when Yamaha went to the BR8HS in the stock engines, I think in '96 with the 62T cases.
The B8HV is a fine wire racing plug and is a more efficient plug than the standard BR8HS.
No you will not hurt anything by using this plug, as it is 1 step colder plug by having a 8 heat range # as the seven is 1 step hotter that the #8. It is a better plug for the ignition.
Does it make a big difference with the V plug verses the S plug...most of the time no, but in a salt water use with MSD big spark applications they work better.
We always switch to the V plug on our aftermarket racing magneto ignitions on our vintage RR motorcycles for better revs up top.

 

[Octane_114]

v-groove plugs-- burn up more of the fuel that is supplied to the cylinder, even with stock electrical. with an enhancer it's like 85% burn if not better. only way i have been able to acheeve 100% burn is to duel plug the head.

 

[Octane_114]

sorry what i was explaining was a v-powered plug NGKBKR6E the ngkb8hv is not. sorry to jack up the thread.

 

[Octane_114]

how could you use these plugs. b8hv isnt the threads too short for a yam or kaw head. meaning that the spark plug wont thread all the way through the head.

 

[yamanube]

how could you use these plugs. b8hv isnt the threads too short for a yam or kaw head. meaning that the spark plug wont thread all the way through the head.

The 650/701/760 (probably 1100/1200NPV motors too) OEM heads use the short thread plugs, Kawasakis and aftermarket Yam. heads (and PV motors) use the long threads.

 

[Octane_114]

O Thats kool. so if they used ngkbr8es or ngkbkr6e the plug would smack the piston!

 

[Matt_E]

No, the ES plug will not smack the piston in a Yamaha motor. (Even though it is too long)

 

[Octane_114]

YEAH NOW THAT I THINK ABOUT IT. IT WOULDNT, it would just stick out deeper in the dome/pocket.

 

[fals3illusion]

so would u guys reccoment me using the B7HS, or the B8HV?
and also, is the B8HV gapped correctly?

if not what should it be set as?

THANKS AGAIN!!!

 

[SUPERTUNE]

I like to gap them @ .024 with non resistor plug caps.