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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Restoring the last of the series "A" Comets.
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<blockquote data-quote="Simon Dinsdale" data-source="post: 100814" data-attributes="member: 58"><p>I made the strange handlebar lever screws for my A and they were right swines to make. I didn't have an original to copy at the time so did a bit of guessing looking at photos of others. The square head I made to fit a 2BA spanner and the thread was 7/32 BSF. This is virtually identical to 1BA and I tried both size of screws in my lever brackets and 7/32 BSF fitted the best so that's what I went with. You need to look at the threads in the levers you are using. You don't want to use the wrong thread and find it strips out of the lever bracket when you pull the brake on hard.</p><p>These strange square head screws were only used on the clutch and brake lever. The other levers just used cheese headed screws which have a very slight dome head. I think they are called slotted fillister screws and Amal used them a lot.</p><p></p><p>Don't forget these screws were probably made by Amal and not peculiar to Vincent's and most probably not always what Amal provided as they would have been expensive compares to a std slotted screw..</p><p>Like a lot of things Vincent would just use what they received from Amal or Miller etc. Its the same reason on series B's bikes were fitted with 6.5" headlights and 8" headlights at the same time. Vincent just ordered a Miller lighting set and fitted whatever Miller provided on that day.</p><p></p><p>Greg is correct that the decompressor was the short type that has a gently S bend to the lever.</p><p></p><p>Simon</p></blockquote><p></p>
[QUOTE="Simon Dinsdale, post: 100814, member: 58"] I made the strange handlebar lever screws for my A and they were right swines to make. I didn't have an original to copy at the time so did a bit of guessing looking at photos of others. The square head I made to fit a 2BA spanner and the thread was 7/32 BSF. This is virtually identical to 1BA and I tried both size of screws in my lever brackets and 7/32 BSF fitted the best so that's what I went with. You need to look at the threads in the levers you are using. You don't want to use the wrong thread and find it strips out of the lever bracket when you pull the brake on hard. These strange square head screws were only used on the clutch and brake lever. The other levers just used cheese headed screws which have a very slight dome head. I think they are called slotted fillister screws and Amal used them a lot. Don't forget these screws were probably made by Amal and not peculiar to Vincent's and most probably not always what Amal provided as they would have been expensive compares to a std slotted screw.. Like a lot of things Vincent would just use what they received from Amal or Miller etc. Its the same reason on series B's bikes were fitted with 6.5" headlights and 8" headlights at the same time. Vincent just ordered a Miller lighting set and fitted whatever Miller provided on that day. Greg is correct that the decompressor was the short type that has a gently S bend to the lever. Simon [/QUOTE]
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Tech. Advice: Series 'A' 500cc/1000cc Bikes
Restoring the last of the series "A" Comets.
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