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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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<blockquote data-quote="greg brillus" data-source="post: 137904" data-attributes="member: 597"><p>Yes you need to cut a flat on that washer........Have you tried to install either of the barrels into the crankcase mouths.........They can be a tight fit depending on who made them or if they are originals. Check the alignment of the primary sprockets........good to set up the genny and drive sprocket at this time, so you can set the correct width spacing and depth of genny sprocket with the slinger in place.........It is a good practice to trial fit things as you go, it takes a little more time, but it is worth it, and saves a bit of heart ache. If you are running the oil feeds to the rear of each cylinder then fit a piston to one rod.......no rings or clips......put the engine to BDC and mark the bore with a fine pencil or texter pen so you know how far down the piston sits at the bottom of the stroke........then you can accurately measure and work out where to drill the feed holes below the bottom piston ring.........very important........You generally need to grind a small vertical channel with a dremel to marry this up to the original feed at the rear of the case mouths.......The factory depth of these is 18 to 20 mm down from the top face of the case, but the new holes though the barrels will be lower than this. I'm away racing this weekend on the Norvin single, so I'll catch you when I get back, hopefully in one piece..........Cheers for now.........Greg.</p></blockquote><p></p>
[QUOTE="greg brillus, post: 137904, member: 597"] Yes you need to cut a flat on that washer........Have you tried to install either of the barrels into the crankcase mouths.........They can be a tight fit depending on who made them or if they are originals. Check the alignment of the primary sprockets........good to set up the genny and drive sprocket at this time, so you can set the correct width spacing and depth of genny sprocket with the slinger in place.........It is a good practice to trial fit things as you go, it takes a little more time, but it is worth it, and saves a bit of heart ache. If you are running the oil feeds to the rear of each cylinder then fit a piston to one rod.......no rings or clips......put the engine to BDC and mark the bore with a fine pencil or texter pen so you know how far down the piston sits at the bottom of the stroke........then you can accurately measure and work out where to drill the feed holes below the bottom piston ring.........very important........You generally need to grind a small vertical channel with a dremel to marry this up to the original feed at the rear of the case mouths.......The factory depth of these is 18 to 20 mm down from the top face of the case, but the new holes though the barrels will be lower than this. I'm away racing this weekend on the Norvin single, so I'll catch you when I get back, hopefully in one piece..........Cheers for now.........Greg. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
1951 Black Shadow Restoration
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