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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Help with Studs
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<blockquote data-quote="Prosper Keating" data-source="post: 12282" data-attributes="member: 1376"><p>For the record, these holes should be threaded 9/16" x 20 tpi (twists per inch). It could be that the threads are simply a bit tight but it would be a good idea, given the cost of the cases, to buy or borrow the right tap and run it down the holes just to be sure. </p><p></p><p>Might also be worthwhile getting someone experienced from your local section to take a look as it would not surprise me in the least if the threads had been cut with the wrong tap, given the source of the cases and the experiences of a couple of friends who had him work on their Vins. </p><p></p><p>In that case, if you're looking at the wrong threads, you might consider having new cylinder head bolts (ET55/2) made up with the appropriate threads. Or boring out the holes and fitting bronze inserts with the correct internal threads to accept the standard ET55/2. </p><p></p><p>As for the threaded spindles, you are presumably referring to the front exhaust cam follower spindle, which threaded 7/16" x 20 tpi, so the hole should be threaded accordingly. The other spindles are an interference fit and you must warm the cases, ideally in an oven for even heat distribution, in order to fit them. The studs on which the steady plate mounts thread into 1/4" BSW holes and take 1/4" BSF retaining nuts. So, again, verify that the holes in the crankcase/timing chest are correctly threaded. </p><p></p><p>PK</p></blockquote><p></p>
[QUOTE="Prosper Keating, post: 12282, member: 1376"] For the record, these holes should be threaded 9/16" x 20 tpi (twists per inch). It could be that the threads are simply a bit tight but it would be a good idea, given the cost of the cases, to buy or borrow the right tap and run it down the holes just to be sure. Might also be worthwhile getting someone experienced from your local section to take a look as it would not surprise me in the least if the threads had been cut with the wrong tap, given the source of the cases and the experiences of a couple of friends who had him work on their Vins. In that case, if you're looking at the wrong threads, you might consider having new cylinder head bolts (ET55/2) made up with the appropriate threads. Or boring out the holes and fitting bronze inserts with the correct internal threads to accept the standard ET55/2. As for the threaded spindles, you are presumably referring to the front exhaust cam follower spindle, which threaded 7/16" x 20 tpi, so the hole should be threaded accordingly. The other spindles are an interference fit and you must warm the cases, ideally in an oven for even heat distribution, in order to fit them. The studs on which the steady plate mounts thread into 1/4" BSW holes and take 1/4" BSF retaining nuts. So, again, verify that the holes in the crankcase/timing chest are correctly threaded. PK [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Help with Studs
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