750 SF Spark Plugs

75 SF, therefore 36mm carbs, large valves so, I've always used NGK B8 ES, never had a plug let me down in over 20 years and 80 000 km. I used BP8 ES recently, they obviously run a bit cooler.
Paul
 
If you ride it hard use B9ES, colder plug and safer. If the motor is tired or you are not able to let it rev a bit stick to the 8s.
Original was Bosch W260T2, pretty much the same as a 9.
There has been a lot of talk lately about fake brand name plugs for sale on the net. Buy from a reputable dealer.
 
I used BP8 ES recently, they obviously run a bit cooler.
Paul
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I know the extended nose plugs are to help keep them clean by (supposedly) burning off the crud, but they would be considered a softer plug than the std "ES" range?? Like Tippie - I use B9ES - have used B10EV for racing - Regards - Phil
 
What would be the suggested for a 750GT with 29mm carbs?  Green book say B9ES and on Wagner's web site says B8ES.  I'd be inclined to use the B8's as it will not be used hard.
Thanks
 
I'd use 9 on an S or SF with higher compression. 8s should be OK on a GT. It's better to foul plugs because they're too cold than hole a piston because they're too hot.

Paul
 
Ernesto said:
NGK recommends BP8ES (with protruding electrode) for the "small head" 750 engines,
B8ES for the "big head" 750 engines.
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Thanks for the info.  Just checked the NGK web site and can't find the reference to BP8ES you mention.  At the NGK web site http://ngkntk.co.uk/wp-content/uploads/2011/03/2013-Motorcycle-Cat.pdf, the only alternative they mention is a BR8EIX which is think is an Iriduim type.  Where is he BP8ES mentioned?
ATB
 
Think of P as in Protruding.. Long nose should burn a bit cleaner.
I also use 9s in the SFC but then I wring it's neck more.
Paul
 
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