Spark plug question? Are these 2 the same?

scooternewby · Post by **scooternewby** » Thu Nov 13, 2008 4:50 pm

Hello. So I have 2 plugs. My scooter has an NGK BPR6HSA in it now. I have a new one and its labled BPR6HS, with no A at the end. Is that the same thing? or should I head back to the store?

Thank you very much

Kenny_McCormic · Post by **Kenny_McCormic** » Thu Nov 13, 2008 5:28 pm

Run what the honda manual recommends, a 6 will work but the 8 is better.

scooternewby · Post by **scooternewby** » Thu Nov 13, 2008 7:12 pm

6 or 8? Im not sure what you mean, OR what is recommended. I was just going by what I took OUT of the scooter.

Does anyone know what the proper plug is?

Dac · Post by **Dac** » Thu Nov 13, 2008 7:22 pm

Kenny_McCormic wrote:Run what the honda manual recommends, a 6 will work but the 8 is better.

Wrong.

for a stock motor 6 is fine. 8 is what people use on bore kits.

scooternewby wrote:6 or 8? Im not sure what you mean, OR what is recommended. I was just going by what I took OUT of the scooter.

Does anyone know what the proper plug is?

Im not sure if the A stands for anything important or not.
I Say your fine. dont worry about it. i think A just stands for something about the plug like "longer life" but something that starts with an A.

To the best of my knowledge, there the same plug. and its the plug that honda recommends.

scooternewby · Post by **scooternewby** » Thu Nov 13, 2008 7:25 pm

The guy at Canadian Tire says it has something to do with its operating heat. . . whatever that means.

Kenny_McCormic · Post by **Kenny_McCormic** » Thu Nov 13, 2008 7:48 pm

6 is for stop go type driving, the 8 is for wide open fully wound out driving. the 8 sucks more heat out of the head.

Bear45-70 · Post by **Bear45-70** » Thu Nov 13, 2008 8:12 pm

The manual says;

Standard - BPR6HS and after '85 BPRSHA
Cold Climate - BPR4HS and after '85 BPR4HSA
Below 41├é┬░ F
Extended High
Speed Riding BPR8HS and after'85 BPR8HSA

That means the 4 is a hotter plug and an 8 is colder. Stick with the standard unless you meet the other requirements.

Oh and to answer your question, no they are not the same.
Don't ask me to decode NGK plug numbers. I can remember that the number is the heat range, hotter = lower # and colder = higher # and the "R" stands for "resister" The rests is lost and gone forever and I no longer have an NGK catalog and their web site sucks.

Bear45-70 · Post by **Bear45-70** » Thu Nov 13, 2008 8:14 pm

Kenny_McCormic wrote:6 is for stop go type driving, the 8 is for wide open fully wound out driving. the 8 sucks more heat out of the head.

Actually the plug pulls the heat out of the plug tip and transfers it to the head.

burnt_toast · Post by **burnt_toast** » Thu Nov 13, 2008 8:24 pm

A is what most stock small bores take, it means extended tip.

Ex. In stock Jog: BR7HSA = extended tip hotter range
In modded Jog: BR9HS = shorter tip, colder heat range

Kenny_McCormic · Post by **Kenny_McCormic** » Thu Nov 13, 2008 8:32 pm

Bear45-70 wrote:
Kenny_McCormic wrote:6 is for stop go type driving, the 8 is for wide open fully wound out driving. the 8 sucks more heat out of the head.
Actually the plug pulls the heat out of the plug tip and transfers it to the head.

Thats what I meant to say.

losthope · Post by **losthope** » Fri Nov 14, 2008 1:24 pm

B=thread diameter/14mm
R=resistor
6=heat range..higher the number the colder the plug
H=thread reach/12.7mm
S=standard copper core centre
A=special design,

Wheelman-111 · Post by **Wheelman-111** » Fri Nov 14, 2008 1:38 pm

Greetings:

All hail Losthope as the king of spark plug knowledge. Thank you! Where did you find this?

scooternewby · Post by **scooternewby** » Fri Nov 14, 2008 1:40 pm

So ITS NOT ok to substitute WITH an A for one WITHOUT an A? Or is it ok?

losthope · Post by **losthope** » Fri Nov 14, 2008 1:42 pm

Wheelman-111 wrote:Greetings:

All hail Losthope as the king of spark plug knowledge. Thank you! Where did you find this?

internet

Wheelman-111 · Post by **Wheelman-111** » Fri Nov 14, 2008 1:46 pm

Greetings:

The Aero 50 manual says BPR-6HS OR-HSA. I'll go out on a limb here and say either one is OK for a stock mill. The wrong plug can cause a lot of trouble but Soichiro Honda himself approved both.

Honda Spree and Elite 50 Forums

Spark plug question? Are these 2 the same?

Spark plug question? Are these 2 the same?

It's In Your Manual