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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Popping on Overrun
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<blockquote data-quote="johncrispin" data-source="post: 34023" data-attributes="member: 53"><p>David,</p><p> Thanks. In hindsight welding the flange on ss sounds like a good solution. The head was bought from a pal and was in lovely condition the ex port thread looked like new, that is because it was more or less. A knowledgeable local member said he recalled a chap in our area that made up a set of o'size taps and used them to restore threads and made nuts to suit. All long in the past now. The thread itself was 1.895" ID and I had a new nut made this size and it is spot on. Interestingly of the three oe bronze nuts I had, one was very tapered from 1.855'' at the end and 1.875 " ( the correct size ) at the fins end, but all were tapered to some extent. Even with this o/size cut in the port I still managed to turn a little off the end of an oe nut and then get it to hold by the skin of its teeth on about three threads using the old steel ex pipe, again without a gasket so I could get the threads as far in as possible to bite. I got going with this but the risk of serious damage to the head with more expensive remedial work was not worth it so I asked for help and the results are excellent, our club is still one of the best in that respect.</p><p> I agree about the 229carbs. But they really are stupid money now. They weren't cheap to start with when they first appeared a couple of years ago but are now £310 before VAT without a float chamber ! I am trying to get my Comet a little more original but it is a very modified bike anyway so I am redressing the balance as it were, and it goes so well with the oe carb oddly enough !</p><p> I get the feeling (call it paranoic if you like) they are trading on the name and have the perception that all Vin owners are millionaires. Materials don't come into it because they charge the same for the rhs alu carb as the l/hand bronze job.hey ho atb J</p></blockquote><p></p>
[QUOTE="johncrispin, post: 34023, member: 53"] David, Thanks. In hindsight welding the flange on ss sounds like a good solution. The head was bought from a pal and was in lovely condition the ex port thread looked like new, that is because it was more or less. A knowledgeable local member said he recalled a chap in our area that made up a set of o'size taps and used them to restore threads and made nuts to suit. All long in the past now. The thread itself was 1.895" ID and I had a new nut made this size and it is spot on. Interestingly of the three oe bronze nuts I had, one was very tapered from 1.855'' at the end and 1.875 " ( the correct size ) at the fins end, but all were tapered to some extent. Even with this o/size cut in the port I still managed to turn a little off the end of an oe nut and then get it to hold by the skin of its teeth on about three threads using the old steel ex pipe, again without a gasket so I could get the threads as far in as possible to bite. I got going with this but the risk of serious damage to the head with more expensive remedial work was not worth it so I asked for help and the results are excellent, our club is still one of the best in that respect. I agree about the 229carbs. But they really are stupid money now. They weren't cheap to start with when they first appeared a couple of years ago but are now £310 before VAT without a float chamber ! I am trying to get my Comet a little more original but it is a very modified bike anyway so I am redressing the balance as it were, and it goes so well with the oe carb oddly enough ! I get the feeling (call it paranoic if you like) they are trading on the name and have the perception that all Vin owners are millionaires. Materials don't come into it because they charge the same for the rhs alu carb as the l/hand bronze job.hey ho atb J [/QUOTE]
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Tech. Advice: Series 'B' / 'C' 500cc/1000cc Bikes
Popping on Overrun
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