Model 20 heads

Information relating to the Matchless G9 or AJS Model 20 500cc twin
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Model 20 heads

Postby Trogg » Sun Dec 30, 2018 3:45 pm

When did the head design change on the model 20? Some have 7 vertical fins in the middle and the "fuller" head has 3 horizontal fins. The rockers too are different with a diagonal arm and a earlier one with part diagonal and part straight arms.
I am putting together a 1954 model and the parts books show many changes around this time.
All information gratefully received.
Paul

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Re: Model 20 heads

Postby G15 Roy » Sun Dec 30, 2018 3:52 pm

Hi Paul It was the 1949-1953 had the ones with stand up fins. 1954 would different but the same as 1955 then from 1956 the drillings changed. email with photos sent.

And I have nothing else to say ;) :twisted: but next time I will use the PM facility to send a message!
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Re: Model 20 heads

Postby robcurrie » Sun Dec 30, 2018 4:02 pm

Where's a good cop when you need one?

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Re: Model 20 heads

Postby G15 Roy » Sun Dec 30, 2018 4:13 pm

Sleeping i hope.
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Re: Model 20 heads

Postby robcurrie » Sun Dec 30, 2018 4:17 pm

Maybe he's waiting for the "someone with some" to make a comment. :lol:

Nope he has been on here editing the entries :twisted:

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Re: Model 20 heads

Postby Trogg » Sun Dec 30, 2018 5:27 pm

Thanks Roy. I have got 2 pairs of early heads and one pair of later heads, so I shall fix the later heads up. Got a couple of rockers and spindles missing but I haven't been through the box of bits yet. I have 3 more sets of crankcases. v.early 50? 53, 59 G9 and an odd half.
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Re: Model 20 heads

Postby robcurrie » Sun Dec 30, 2018 8:57 pm

robcurrie wrote:Maybe he's waiting for the "someone with some" to make a comment. :lol:

Nope he has been on here editing the entries :twisted:

Rob C

What happened to fair cop?
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Re: Model 20 heads

Postby clive » Sun Dec 30, 2018 9:27 pm

bored with the usual miscreants so trying a new tactic!
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if it ain't broke don't fix

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Re: Model 20 heads

Postby G15 Roy » Mon Dec 31, 2018 8:26 am

clive wrote:bored with the usual miscreants so trying a new tactic!


I have been Edited :o
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Re: Model 20 heads

Postby ajscomboman » Mon Dec 31, 2018 10:23 am

G15 Roy wrote:
clive wrote:bored with the usual miscreants so trying a new tactic!


I have been Edited :o


That's better than being violated!!!! :rofl: :rofl:

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