1954 Mercury Mark 20 vs. Mark 20H; Difference

[negativecold13]

What is the difference between these two outboards? And what identifies the 20H as such?

I have looked at several pictures of both and the only difference I can tell so far is where the mount holes are drilled on the front emblem face. Thanks.

 

[brim_buster]

Re: 1954 Mercury Mark 20 vs. Mark 20H; Difference

could it be one is tiller and the other isnt?:facepalm:

 

[racerone]

Re: 1954 Mercury Mark 20 vs. Mark 20H; Difference

The 20H is the factory racing motor---- Special racing lower unit.---------Different crankshaft center main bearing too ----------------Mark 20 is a collectable motor.-------Mark 20H is a " keeper " for most folks who have one.----You will see a Mark 20H for sale at $2000.00+ or more.

 

[brim_buster]

Re: 1954 Mercury Mark 20 vs. Mark 20H; Difference

The 20H is the factory racing motor---- Special racing lower unit.---------Different crankshaft center main bearing too ----------------Mark 20 is a collectable motor.-------Mark 20H is a " keeper " for most folks who have one.----You will see a Mark 20H for sale at $2000.00+ or more.

:joyous:

 

[carholme]

Re: 1954 Mercury Mark 20 vs. Mark 20H; Difference

Mark 20:

Mark 20

Mark 20H:

Mark 20H


Gerry

 

[Chinewalker]

Re: 1954 Mercury Mark 20 vs. Mark 20H; Difference

It is not possible to turn a Mark 20 into a Mark 20H, simply too many changes to the crankcase, cylinder block, crankshaft, rods, pistons, etc., plus completely different mid-section and lower unit.

 

[negativecold13]

Re: 1954 Mercury Mark 20 vs. Mark 20H; Difference

Thanks for that info, great links...mine is defianantly the Mark 20... was hoping to have the 20 H, but still a nice looking outboard

 

[Chinewalker]

Re: 1954 Mercury Mark 20 vs. Mark 20H; Difference

Regarding the holes in the face plate... The original Mark 20H came with a Carter model N-2150 which had the low speed needle top center and high speed needle bottom center. Top needle got a corresponding hole in the face plate dead center, while the bottom needle got a tiny indent on the bottom of the plate right at the 'V'. The stock Mark 20 had a Tillotson AJ-series carb which had offset low speed needle at about 1:00 and the high speed at about 7:00 with corresponding holes in the face to match.