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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ATD Springs
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<blockquote data-quote="Martyn Goodwin" data-source="post: 43266" data-attributes="member: 2433"><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">A good nights sleep is (possibly?) a wonderful thing. The reason I am thinking weak ATD springs isbecause of what I observe when I am setting up the timing. Before I fit the ATD I can flip the ATD mechanismand it returns smartly to the fully retarded position – all seems OK BUT once I install it on the magneto with thetiming set fully retarded at 6 BTDC then if I flip the ATD mechanism manuallyit does not return to the fully retarded position, but seems to “get stuck” midway.</span></span></span></p><p> </p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">Last night (late) I replaced the ATD springs with a knowngood and new set of ATD springs (thanks Charlie) then reinstalled all – and observedEXACTLY the same behaviour of the ATD.</span></span></span></p><p> </p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">With hindsight I wonder if this in fact normal?? I am now wondering if what was making it appearthat way is, installed on the magneto the ATD springs – in a static positionwith the mag points just opening – are also fighting the magnetic force that isacting on the ATD armature trying to rotate it and in doing so giving me thefalse impression that the ATD springs are too weak?</span></span></span></p><p> </p><p><span style="font-size: 12px"><span style="color: #000000"><span style="font-family: 'Calibri'">Martyn</span></span></span></p><p> </p></blockquote><p></p>
[QUOTE="Martyn Goodwin, post: 43266, member: 2433"] [FONT=Times New Roman][SIZE=3][COLOR=#000000][/COLOR][/SIZE][/FONT][SIZE=3][COLOR=#000000][FONT=Calibri]A good nights sleep is (possibly?) a wonderful thing. The reason I am thinking weak ATD springs isbecause of what I observe when I am setting up the timing. Before I fit the ATD I can flip the ATD mechanismand it returns smartly to the fully retarded position – all seems OK BUT once I install it on the magneto with thetiming set fully retarded at 6 BTDC then if I flip the ATD mechanism manuallyit does not return to the fully retarded position, but seems to “get stuck” midway.[/FONT][/COLOR][/SIZE] [FONT=Times New Roman][SIZE=3][COLOR=#000000][/COLOR][/SIZE][/FONT][FONT=Calibri][SIZE=3][COLOR=#000000] [/COLOR][/SIZE][/FONT] [FONT=Times New Roman][SIZE=3][COLOR=#000000][/COLOR][/SIZE][/FONT][SIZE=3][COLOR=#000000][FONT=Calibri]Last night (late) I replaced the ATD springs with a knowngood and new set of ATD springs (thanks Charlie) then reinstalled all – and observedEXACTLY the same behaviour of the ATD.[/FONT][/COLOR][/SIZE] [FONT=Times New Roman][SIZE=3][COLOR=#000000][/COLOR][/SIZE][/FONT][FONT=Calibri][SIZE=3][COLOR=#000000] [/COLOR][/SIZE][/FONT] [FONT=Times New Roman][SIZE=3][COLOR=#000000][/COLOR][/SIZE][/FONT][SIZE=3][COLOR=#000000][FONT=Calibri]With hindsight I wonder if this in fact normal?? I am now wondering if what was making it appearthat way is, installed on the magneto the ATD springs – in a static positionwith the mag points just opening – are also fighting the magnetic force that isacting on the ATD armature trying to rotate it and in doing so giving me thefalse impression that the ATD springs are too weak?[/FONT][/COLOR][/SIZE] [FONT=Times New Roman][SIZE=3][COLOR=#000000][/COLOR][/SIZE][/FONT][FONT=Calibri][SIZE=3][COLOR=#000000] [/COLOR][/SIZE][/FONT] [FONT=Times New Roman][SIZE=3][COLOR=#000000][/COLOR][/SIZE][/FONT][SIZE=3][COLOR=#000000][FONT=Calibri]Martyn[/FONT][/COLOR][/SIZE] [FONT=Times New Roman][SIZE=3][COLOR=#000000][/COLOR][/SIZE][/FONT][FONT=Calibri][SIZE=3][COLOR=#000000] [/COLOR][/SIZE][/FONT] [FONT=Times New Roman][SIZE=3][COLOR=#000000][/COLOR][/SIZE][/FONT] [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
ATD Springs
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