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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin: rear engine mounting bolt F47/F83?
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<blockquote data-quote="brian gains" data-source="post: 111588" data-attributes="member: 3153"><p>OK , thanks for that c. bore , I can see on closer look that the UFM plates have horizontally elongated holes and I guess the shouldered bush at either end of F47 has corresponding flats which I did not immediately appreciate from photos.</p><p></p><p>Yes, my query was with regard the VinBsa which I am going over. I had read horrific reports of the head cracking if there was no allowance for movement in this area. In my case the 'massaged' FT3 plate has independent (aluminium ) mounting plates bolted to the frame and I am considering how to introduce allowance for expansion. <strong>Does anyone have the larger and smaller diameter measurement for F83?</strong>. I am also thinking that the aluminium plates ought to be replaced with steel to make more durable/robust.</p><p></p><p>I may as well confess now, probably better suited to it's own thread, but Dick Sherwin saved me from humiliation by submitting a photo of the LHS of the machine therefore not revealing that it is a chopped motor with a Norton box. I had naively thought this was done as an economical and acceptable replacement for an original box that had suffered a catastrophic failure. However reading around the subject I now realise it was more commonly done just to shoehorn the motor into a frame with questionably better handling characteristics. I don't mean to start a bun fight but apart from production hybrids I must say even I find this a heretical practise.</p></blockquote><p></p>
[QUOTE="brian gains, post: 111588, member: 3153"] OK , thanks for that c. bore , I can see on closer look that the UFM plates have horizontally elongated holes and I guess the shouldered bush at either end of F47 has corresponding flats which I did not immediately appreciate from photos. Yes, my query was with regard the VinBsa which I am going over. I had read horrific reports of the head cracking if there was no allowance for movement in this area. In my case the 'massaged' FT3 plate has independent (aluminium ) mounting plates bolted to the frame and I am considering how to introduce allowance for expansion. [B]Does anyone have the larger and smaller diameter measurement for F83?[/B]. I am also thinking that the aluminium plates ought to be replaced with steel to make more durable/robust. I may as well confess now, probably better suited to it's own thread, but Dick Sherwin saved me from humiliation by submitting a photo of the LHS of the machine therefore not revealing that it is a chopped motor with a Norton box. I had naively thought this was done as an economical and acceptable replacement for an original box that had suffered a catastrophic failure. However reading around the subject I now realise it was more commonly done just to shoehorn the motor into a frame with questionably better handling characteristics. I don't mean to start a bun fight but apart from production hybrids I must say even I find this a heretical practise. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Twin: rear engine mounting bolt F47/F83?
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