NGK 7 will damage your engine it's way too hot......NGK are aware that their catalogue listing is incorrect.

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Mithered ta death.
92 MB
96 S2T
98 S1W
00 M2
01 X1
03 P3
10 CR

Look out for next weeks thread

'Why is my new S1 f**ked?'

I use NGK simply because my nearest HD outlet that I'm prepared to spend money with is 80 miles away. The correct heat grade for a NGK plug is 9 NOT the 7.

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If your dreams don't scare you, they are not big enough.

For Sale 2 x DCPR7E IX ......thanks I sense your concern, so Harley plugs it is then I'll pop over Cheltenham HD the weekend and get some.

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S1WL

just to update the infotrail 2 x 10R12A £5.38 inclusive ...that would be a price drop then

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S1WL

new plugs fitted, but it still has a random cough. So I wonder, should I apply a Mikuni HSR42 or is there some wonder, bleedin obvious cure I'm overlooking.

All filters appear clear, HT leads seem sound.

Is there a common cause of random misfire on these bikes I might explore?

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S1WL

As mentioned before, I'd have a look at your intake manifold rubbers, to check for perishing.

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I started out with nothing and still got most of it left.