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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing Case Assembly
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<blockquote data-quote="chankly bore" data-source="post: 40311" data-attributes="member: 317"><p>Yes, the Workshop Instructions are a counsel of perfection regarding the original Datum face (timing cover mating face) and heights of spindles relative thereto. 60 years of wear and warp and oddly manufactured components supplied in that time all lead to this: Start with a good round cam pinion with the cam of your choice, running on good bushes, Get the followers tracking central with whatever shims they need, get a good steel idler on a one-piece boss and prove as near as dammit zero backlash, then ask your friendly spares man for a selection of half-time pinions and get the same backlash after checking for tight spots.Fit a steel small idler. Set the generator pinion with a little free play if you must- it is better than stretching your seals there. prove your oil feed to the camshaft and the back of the piston. Laurie Binns has a jig to insert spindles to the correct height. Your spares man has many shims in stock. By the way, I went to .005" bottom skirt clearance with a noisy exhaust like yours you should do likewise!</p></blockquote><p></p>
[QUOTE="chankly bore, post: 40311, member: 317"] Yes, the Workshop Instructions are a counsel of perfection regarding the original Datum face (timing cover mating face) and heights of spindles relative thereto. 60 years of wear and warp and oddly manufactured components supplied in that time all lead to this: Start with a good round cam pinion with the cam of your choice, running on good bushes, Get the followers tracking central with whatever shims they need, get a good steel idler on a one-piece boss and prove as near as dammit zero backlash, then ask your friendly spares man for a selection of half-time pinions and get the same backlash after checking for tight spots.Fit a steel small idler. Set the generator pinion with a little free play if you must- it is better than stretching your seals there. prove your oil feed to the camshaft and the back of the piston. Laurie Binns has a jig to insert spindles to the correct height. Your spares man has many shims in stock. By the way, I went to .005" bottom skirt clearance with a noisy exhaust like yours you should do likewise! [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Timing Case Assembly
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