Spark Plug

[Anonymous]

What spark Plug do use in my Johnson 1930 V45 26hp motor?

chuck86
doggone@velocity.net

[hydrojet]

Chuck, Hunn,s Book 3rd. addition in bacl has a list K45 ,Champion R7 no crossover I see.

[Buccaneer]

18mm spark plug heat range chart … Hottest on top, Coldest on bottom

Champion – – – AC – – – Autolite – Bosh – Motorcraft Prestolite
C7 (D23) – – – – – –
C15(D21) – – – C88 – – – – – – – – – – BT9
7 (D16) – – – C87 – – – – – – – – – – B8X
6M (D14) – – – C85 – – – 386
5M (D9) – – – C82 – – – 373 – – M8A – — – BT4 – – – 18-3
R7 (D6) – – – – – – 372 – – M7A
R1
R11
R11S Old racers using Alcohol
R2
R2S Using Nitromethane.

Prepare to be boarded!

[dockbuster1]

I am running D 9 in the upper three and a D14 in # 4 of my V45 The vacturi carb runns a little leaner My fuel is 91 octaine alchol free 2and1/2 gal to one pt of TCW 3 and 1 QT 50 wt non detergent plugs are chocklate run e’m and check e’m

[Randy in Tampa]

The Champion D9’s are the norm but I run NGK AB6 in mine and in all my P,S,V and PO’s and in my speeditwins, they seem to like them better😉

Rotary valve Johnson’s Rule!

[Author]

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