Spark plugs

[snow-doo]

Why does the 21,22 ski foo 850 turbo use different spark plugs tha the heat range on a 201/2,23,24.Look them up and it shows different,but the owners manual doesn’t

 

[TheBeattie]

If I'm reading that correctly, it's likely due to intake temperatures after adding boost pressure and cylinder head design. Buy the ones listed in the parts fiche. I just picked up a set from my local dealer and they were having a confused discussion about which ones I needed. Was a little funny and concerning at the same time.

 

[turbo800]

I don't think you could go wrong with either ones, IMO.
I've run 4 full seasons on my '17 850 factory plugs with the MPI turbo kit @ 200HP.
Roughly 6 psi boost on 91 ethanol free fuel, no deto.