spark plugs

**Wed Mar 04, 2009 5:37 am » Post: #1 » Download Post**

Hi everyone.
I have an ns250r mc11. one cylinder was running badly so I took the spark plugs out to cheek them and they are different. one is a BP6ES and one is a B8ES. Is this right should they be different? I'm new to bikes but keen to learn so if someone could explain to me why they would be that would be great.
thanks for any help

**Wed Mar 04, 2009 1:26 pm » Post: #2 » Download Post**

Hello dynamite, and welcome to the forum.

I don't have any data for the MC11 I'm afraid, but my (non)educated guess would be that I expect the B8ES plug (or more likely a B9ES probably) would be the correct one, and should be the same in both cylinders under 99% of cases.

Possibly the same plug required as the NS400R: BR8ES or BR9ES (gap 0.7~0.8mm).
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**Wed Mar 04, 2009 5:35 pm » Post: #3 » Download Post**

Which plug was in the badly running cylinder?
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**Wed Mar 04, 2009 6:49 pm » Post: #4 » Download Post**

I'll put my 50p on the cylinder with the BP6ES... Smile

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Andy.
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**Wed Mar 04, 2009 6:51 pm » Post: #5 » Download Post**

I thought that was the plug Dave was running at the first dyno day Laughing

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**Wed Mar 04, 2009 11:51 pm » Post: #6 » Download Post**

Hi thanks for the replys.
I dont know what one was running badly because it was runing intermitantly. (mind the spelling) and was running when I turned it off before I looked at the plugs. should have cheaked realy. I guess I will try new B8ES or B9ES in both cylinders. its not like they are breaking the bank if its rong.
thanks for your help

**Sat Mar 07, 2009 6:15 am » Post: #7 » Download Post**

Andy wrote:Hello dynamite, and welcome to the forum.

I don't have any data for the MC11 I'm afraid, but my (non)educated guess would be that I expect the B8ES plug (or more likely a B9ES probably) would be the correct one, and should be the same in both cylinders under 99% of cases.

Possibly the same plug required as the NS400R: BR8ES or BR9ES (gap 0.7~0.8mm).

Nice info sir, but I'm agree with you, no matter what is the engine type, I think the plug must be same, because the orginally from the fabric is like that.