Timing marks

Information relating to the Matchless G80 or AJS Model 18 500cc Heavyweight.
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itma
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Timing marks

Post by itma »

I presume this is a 500 single[?] You should have cams marked with an H or HL and if they are ,for 57 engines use as follows:
350cc 3 inlet, 1 exhaust all use the dash on the small pinion
500CC 2 inlet, 1 exhaust
previous to this 1954-55
350 3 inlet 2 exh.
500 2 inlet and 2 exh
If your cams are only marked 1 & 2 then you have even older cams, use 2 for both sides.
.
remember, suck, squeeze, bang ,blow when watching the cams work[:D]
give my regards to the reindeer![:)]

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Biscuit
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Timing marks

Post by Biscuit »

To add to Ken's advice, the dot on the halftime pinion is at the root of a tooth, if you can't see it, remove the nut, which has a left hand thread. When replacing the cams, turn the engine untill the halftime pinion dot points to the inlet cam bush, insert cam as per Ken's instructions and then rotate engine forward until dot faces the exhaust cam bush and insert cam.

You really should get the manual!!



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john
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Timing marks

Post by john »

Great stuff,
I think this confirms my understanding but I was greatly confused by the illustration in the Osborne Manual (fig 22). Which shows a 54-55 model using No1 mark to time the exhaust. Is this a typo?


itma
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Timing marks

Post by itma »

no, it means the author did not do his research
G15 Roy
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Timing marks

Post by G15 Roy »

I see Alan has been re named. Alan Jakobs?.

Roy
itma
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Timing marks

Post by itma »

Das ist korrecte
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