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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series ‘D’ Breather
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<blockquote data-quote="Cyborg" data-source="post: 115879" data-attributes="member: 3426"><p>Thanks Greg. The cases are a bit of a mystery in that they were not a matched set and the mating numbers suggest that the drive side was machined prior to Harper and the timing side was done after Harper took over. </p><p> I have a mill and it is large enough to get the cases in, but then no room left to stuff anything into the quill. I formulated a plan of attack, but wanted to bounce it off the master, just to make sure I was headed in the right direction. Long story short, he took pity on me and removed the luck factor. I have machined a few precious things like Norton cam boxes, but these were a daunting task, so happy I caught him waiting for the rain to stop. Definitely above my pay grade. Mains on both sides were undersize (which strikes me as odd given the mating #’s) as were the bores for the G14 and G15. The G14,15 bores were also tapered, but there was enough meat there to straighten them out. Some of the spindle bores were undersize as well. I had 2 new ET30/3 and the smaller of the 2 is a very snug fit in the bore. The breather spindle went in with the flat up, so hopefully it’ll retain a bit of oil. One of the new E91 bearings didn’t pass muster, because it had too much runout and I was instructed to tell the vendor to stick it.</p><p>The ET92 and ET94 races were lapped to size and the decks came out to less than .001” over 10 inches, so I now have a (quote) “ beautiful set of cases”.</p></blockquote><p></p>
[QUOTE="Cyborg, post: 115879, member: 3426"] Thanks Greg. The cases are a bit of a mystery in that they were not a matched set and the mating numbers suggest that the drive side was machined prior to Harper and the timing side was done after Harper took over. I have a mill and it is large enough to get the cases in, but then no room left to stuff anything into the quill. I formulated a plan of attack, but wanted to bounce it off the master, just to make sure I was headed in the right direction. Long story short, he took pity on me and removed the luck factor. I have machined a few precious things like Norton cam boxes, but these were a daunting task, so happy I caught him waiting for the rain to stop. Definitely above my pay grade. Mains on both sides were undersize (which strikes me as odd given the mating #’s) as were the bores for the G14 and G15. The G14,15 bores were also tapered, but there was enough meat there to straighten them out. Some of the spindle bores were undersize as well. I had 2 new ET30/3 and the smaller of the 2 is a very snug fit in the bore. The breather spindle went in with the flat up, so hopefully it’ll retain a bit of oil. One of the new E91 bearings didn’t pass muster, because it had too much runout and I was instructed to tell the vendor to stick it. The ET92 and ET94 races were lapped to size and the decks came out to less than .001” over 10 inches, so I now have a (quote) “ beautiful set of cases”. [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Series ‘D’ Breather
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