1949 AJS magneto chain deflection

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Mac01
Posts: 28
Joined: Sun Sep 02, 2018 8:05 am
Location: Kent UK

1949 AJS magneto chain deflection

Post by Mac01 »

Afternoon all.
I am fitting the magneto drive chain on my 1949 AJS 350 and the manual states that the chain deflection is " J ".
What does J refer to ?
Someone else suggested that the deflection is 1/4 inch, on the drive side of the chain.
Is anyone able to assist ?

Thanks. Mac.
SPRIDDLER
Member
Posts: 8542
Joined: Wed Sep 01, 2004 1:00 am
Location: WEST SUSSEX UK

Re: 1949 AJS magneto chain deflection

Post by SPRIDDLER »

1/4" will be fine (on either run of the chain).
This is from page 51 the 1951 manual
http://archives.jampot.dk/book/Owners_m ... Manual.pdf
Mag chain adj.JPG
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'There is a tide in the affairs of men
Which taken at the flood............'
Mac01
Posts: 28
Joined: Sun Sep 02, 2018 8:05 am
Location: Kent UK

Re: 1949 AJS magneto chain deflection

Post by Mac01 »

Thank you so much.
I've owned Triumph and BSA twins over the last 40 odd years and chain driven mags are new to me.

Mac.
SPRIDDLER
Member
Posts: 8542
Joined: Wed Sep 01, 2004 1:00 am
Location: WEST SUSSEX UK

Re: 1949 AJS magneto chain deflection

Post by SPRIDDLER »

Mac01 wrote:Thank you so much.
I've owned Triumph and BSA twins over the last 40 odd years and chain driven mags are new to me.

Mac.
Just a tip............set the ign timing by loosening the lower (cam gear) sprocket rather than the one on the mag shaft. It's far easier as the lower sprocket is less likely to move when you tighten the nut. If you put a socket (one that's larger than the nut) against the sprocket and give it a sharp tap before final tightening of its nut it'll be less likely to move.
'There is a tide in the affairs of men
Which taken at the flood............'
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