Should an HS or ES plug be used on BRN Head?

Been using a B6HS spark plug on a V1 with a 47mm BRN head. Can it use an ES length spark plug or will it be too long and damage the head?

Re: Should an HS or ES plug be used on BRN Head?

Easy way to tell is to put an ES in the head, turn the flywheel over by hand gently and see if it hits it. If it doesn't you're good.

Re: Should an HS or ES plug be used on BRN Head?

Best way to tell is pull the head .

Insert plug .

If threads show , it's likely too long for optimal spark placement , even if it clears the piston .

Re: Should an HS or ES plug be used on BRN Head?

> Jai Dot Wrote:

> -------------------------------------------------------

> Been using a B6HS spark plug on a V1 with a 47mm BRN head. Can it use an

> ES length spark plug or will it be too long and damage the head?

I am using a hs on my brn head. I did not check to see how far the plug goes in but it definitely is not hitting the piston so it is not too long.

Re: Should an HS or ES plug be used on BRN Head?

> Jay Rivett Wrote:

> -------------------------------------------------------

> > Jai Dot Wrote:

>

> > -------------------------------------------------------

>

> > Been using a B6HS spark plug on a V1 with a 47mm BRN head. Can it use

> an

>

> > ES length spark plug or will it be too long and damage the head?

>

> I am using a hs on my brn head. I did not check to see how far the plug

> goes in but it definitely is not hitting the piston so it is not too

> long.

Did you mean to say ES?

Re: Should an HS or ES plug be used on BRN Head?

No, I said hs, because the plug in my garelli with a brn head is a b7hs.

I have never run an ES in my bike.

Re: Should an HS or ES plug be used on BRN Head?

> Jay Rivett Wrote:

> -------------------------------------------------------

> No, I said hs, because the plug in my garelli with a brn head is a b7hs.

>

> I have never run an ES in my bike.

Well he's already running an HS so that wasn't really the debate lol. Saying it's not too long is obvious since it's the short one.

But yeah removing the head and screwing in an es and looking at it is the easiest way to tell for certain

Re: Should an HS or ES plug be used on BRN Head?

Thank you for the input. but, in lew of taking the engine apart is there any way to tell if its safe.

Is there anyone that has run an ES on a 47mm BRN super street squash head on a polini.

Any help would be apreciare.

Thank you in advance.

Re: Should an HS or ES plug be used on BRN Head?

Use your head . The one above your shoulders .

Simply remove the spark plug and measure the depth of the threads in the motor head .

That's the length of spark plug thread that should be used .

Re: Should an HS or ES plug be used on BRN Head?

> P D Wrote:

> -------------------------------------------------------

> Use your head . The one above your shoulders .

>

> Simply remove the spark plug and measure the depth of the threads in the

> motor head .

>

> That's the length of spark plug thread that should be used .

gee, tried that. It won't fit in there the hole is too small; 14mm I think. Not sure?

Re: Should an HS or ES plug be used on BRN Head?

You have nothing that fit's in that hole ?

Try a tooth pick .

Re: Should an HS or ES plug be used on BRN Head?

I'll make a tool out of a bent wire or just run the 12mm thread length espese for the stock head. Thank you for you advise; I just thought that someone might have run a plug with a 19mm thread before.

Thanks again.

« Go to Topics — end of thread

Want to post in this forum? We'd love to have you join the discussion, but first:

Login or Create Account