spark plug question

[pipey]

H
I recently purchased a service kit from a well known BMW parts supplier for my 03 1150 twin spark. In the kit came 2 Bosch and 2 NGK plugs.
so is there a primary plug and which plugs would go where? i assume theres a reason for suppling 2 types.

thanks in advance.
pipey.

 

[Timolgra]

All will become clear when you compare the old plugs for size when removing them.

 

[Steptoe]

Hfor my 03 1150 twin spark. .

there's the clue.

Main plugs are different to the secondary plugs.
When you remove them you'll see which goes where.

And if you can't find the spark plugs why have you bought a service kit without a workshop manual.

 

[pipey]

Thanks guys