750 sf spark plugs

L

ludiluka

Senior member
Hi there

What spark plugs are the best for 750 sf. I am using bosch spark plugs now but they failed 2 times in 5000km another thing is that when i install new spark plugs engine is running better than after 500km. I tried several different heat grades but without luck so far.
 
Neither my road nor race twins are sensitive to or seem to chew
out spark plugs. The NGK mentioned or Champ N2 or N3 as well
as ND in that heat range. You may have another issue that needs
fresh plugs. Are your caps, leads, coils etc all good? Carbs well set up?
 
I think this highlights the immense diferences between the same plug in different machines and using different fuel and suppliers (more of that in a moment).
As highlighted, problems down to state of tune and the possibility of counterfeit goods.

After experiencing some really bad running on my Jota 120 I turned to Champion N2C's. I expected a step up in performance. But got worse. I went back to some brand new NGK B8ES and sweet as a nut.

However! Before we get 1000 testimonies of how good Champions are - it was more likely the fuel!!!!!!!!!
I standardised on BP Ultimate and she always runs great.
Any compatible plug would probably be fine now.
 
Hi there

I changed plugs yesterday for nkg and so far so good. I don't think that  it is fuel in my case. I was using bosch plugs in all my classic bikes but quality is dropping rapidly i bought 2 bosch plugs in 6 months that died after only 10 min.
 
Hello,

NGK BP8ES or BP9ES? I thought the numbers had with heat value of the spark plug and it was important.
What is the right spark plug two orgenial 750 SF?

Does anyone know the tightening torque using the spark plug?
Thanks
 
No P in SF plugs (at least not the big valve heads).
P is "protruding electrode".
Original in Oz were Bosch W260T2. Heat range about
mid between NGK 8 and 9.
 
Hello again,

Ok, now that it is fit NGK BP 8 ES and they need replacing. Then i need NGK B 8 ES or NGK B 9 ES as I understand you.

If there are large vents on this, I have no idea. The engine is overhauled 25000km ago and after I realized that he has retained the original. There are 750 SF, 1971 model with the same engine that came with the bike when it was rolled out of the factory.

Thanks for all your help.
 
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