Plug reach

[bigk]

Can anyone tell me what reach plug to use in an '81 KTM390 please?
It has an ES/EV series in it and ran fine, but the plug hangs through into the combustion chamber heaps. I'm thinking the threads will carbon up and make the plugs a pain to change and risk damage to the thread in the head. Should I use a HS (shorter reach)plug? My NGK book is obscure at best in the applicetion.
Cheers,
K

[oz555ktm]

Short

NGK B9ES

[Noel]

Do not want to question your knowledge of KTMs Dennis
but would you like to think about that again,
B9ES (19)has a longer thread than B9HS (12.7)
Cheers
Noel

[Lozza]

Lots of times I go to great lengths to sink the plug into the head like that.

[bigk]

It's the ES series that hangs through heaps and is what was in the bike. HS series sit nicely.I want to have the correct plug in the bike as I don't want to have any dramas.
Cheers,
K

[oz555ktm]

Thanks Noel

I cant slell for shit and I cant type .

Bosh          w 340 s1s

Champion   L 3G

NGK       B9 HS

Plug gap   0.6mm

That a Beer Iou Noel

[bigk]

Thanks, I thought the HS would be correct.
Cheers,
K

[subarumy98]

I always understood it was the B8ES or B9ES.
We use the B8 up here, (1000m altitude), and it works really well.

Time to go read the manual in bed again