Stubborn 750 cam chain fitment

"Nuts with yellow caps were only used on 750s built in 1974 onwards."
this is going to make the shit hit the fan, no offence to you Marnix my VERY LEARNED friend, but I know of one 1973 SF1 that was made new with yellow plastic inserted head nuts.....mine! bought new, delivered on 21st may 1973 and I had to wait for the delivery, it might have been two months? maybe three or four, I cannot re-call, but then a (tiny) anomily like this was common at Moto laverda. Bleeding hell we realy are rivet counting here boys, and Piet, I knew it, I just knew it, lovely picture of your nuts!
CLEM
 
CLEMTOG said:
"Nuts with yellow caps were only used on 750s built in 1974 onwards."
this is going to make the shit hit the fan, no offence to you Marnix my VERY LEARNED friend, but I know of one 1973 SF1 that was made new with yellow plastic inserted head nuts.....mine! bought new, delivered on 21st may 1973 and I had to wait for the delivery, it might have been two months? maybe three or four, I cannot re-call, but then a (tiny) anomily like this was common at Moto laverda. Bleeding hell we realy are rivet counting here boys, and Piet, I knew it, I just knew it, lovely picture of your nuts!
CLEM
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And I knew you'd like 'em... :giggle:

I've also found the plastic-capped nuts on many earlier engines, but with the track record of many of these engines, that doesn't necessarily mean they were factory installed. In fact, I've found the all-steel items to be quite rare in this aplication.

piet
 
Tippie said:
Pretty sure I saw some later triples with a rounded dome nut on the primary, but my memory is not to trust (if it ever was). The yellow head nuts are a bit like Laverda signature hex bolts aren't they?
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You are correct Tippie, I’ve owned this bike since new and it has always had this domed nut on the primary adjuster 1989 jota from your old employer Stanco😀👍IMG_2492.jpeg
 

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Haggis said:
My knob looks exactly like Tom's >> '79 Jota

That's one hell of a stack of washers there Tom - your shaft is clearly longer than mine.
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Possibly a 750 adjuster screw fitted instead of the shorter triple item? About 5-6mm difference.

piet
 
ozijotati said:
Everything is as per delivery to me in 1980. Washers just used as packing😂
Tom
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Normally one thin washer under the locknut, 3 thick ones under the dome nut to accomodate the protruding length of adjuster screw, to be removed as adjuster is screwed inwards to take up chain wear.

I've long suspected that new bikes were often raided while standing in showrooms to be able to satisfy customers urgently seeking spares, especially when supply chains were long and slow. All OK if correct parts are eventually fitted to complete the bike when sold, but possibly often bodged because the boat with the ordered spares just sank... :rolleyes: Would explain the fitment of non-standard bits from "new".

The adjuster screws and dome nuts, along with primary covers, could have been in high demand back in the days when we were fearless/immortal.

BTW, nice wheels Tom! Campagnolo repros?

piet
 
Sorry Piet, not campo replicas but PVM forged wheels. Don’t get me started on that sorry of dealing with the manufacturer. Even Lothar who tried to help me was astounded at customer service. Still, they are beautiful wheels and very light and enable the fitting of modern radial tubeless tyres, the main reason for the upgrade.😊
Tom
 
ozijotati said:
Sorry Piet, not campo replicas but PVM forged wheels. Don’t get me started on that sorry of dealing with the manufacturer. Even Lothar who tried to help me was astounded at customer service. Still, they are beautiful wheels and very light and enable the fitting of modern radial tubeless tyres, the main reason for the upgrade.😊
Tom
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Fuck me, I’m wrong again (insert Bolt emoji here)

Mind you, I think they look great.
 
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