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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rebore
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<blockquote data-quote="timetraveller" data-source="post: 7440" data-attributes="member: 456"><p>Unless the job is done by someone who knows his Vincents then you should check the base of the cylinder for perpendicularity to the bore after the job is done. To do this you will need to make something up which fits into the top and bottom of the new bores and allows the muff and liner to be spun in centres. Having checked several at Roy Robertson's then typically you will find about five thou run out on the base and probably the top. The top is not critical but it better if it is correct, the base is super-critical if modern low clearance pistons are to be used. Typical recommendation on these pistons is three thou clearance. If the tilt of the base is for and aft then you might get away with it. If it is side to side you will not.</p><p> </p><p>This festive theme is making me mutter bah, humbug! Crusty old devil!!</p></blockquote><p></p>
[QUOTE="timetraveller, post: 7440, member: 456"] Unless the job is done by someone who knows his Vincents then you should check the base of the cylinder for perpendicularity to the bore after the job is done. To do this you will need to make something up which fits into the top and bottom of the new bores and allows the muff and liner to be spun in centres. Having checked several at Roy Robertson's then typically you will find about five thou run out on the base and probably the top. The top is not critical but it better if it is correct, the base is super-critical if modern low clearance pistons are to be used. Typical recommendation on these pistons is three thou clearance. If the tilt of the base is for and aft then you might get away with it. If it is side to side you will not. This festive theme is making me mutter bah, humbug! Crusty old devil!! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Rebore
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