LJ.
Peterborough UK.
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The Red A10!
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« on: 04.06. 2011 20:40 » |
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So who's snapped up that Longstroke cylinder head complete with its twin carbs & rocker boxes etc? I thought the buy-it-now price of £250 was pretty reasonable considering how rare the manifold is, and the carbs are likely to be a matched pair too. I've been watching these with interest to see just how much they would go. I'd probably have had a bid on them too. Come on own up! http://cgi.ebay.co.uk/BSA-A7-EARLY-STAR-TWIN-CARB-HEAD-ROCKERS-48-52-/330570608076?pt=UK_Motorcycle_Parts&hash=item4cf78b2dcc |
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Ride Safely Lads! LJ. ********************** 1940 BSA M20 500cc Girder/Rigid- In Bits! 1947 BSA M21 600cc Girder/Rigid-Green 1949 BSA A7 500cc Girder/Plunger Star Twin-Black 1953 BSA B33 500cc Teles/Plunger-Maroon 1961 BSA A10 650cc Golden Flash-Blue 1961 BSA A10 650cc Golden Flash-Red  |
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900triple
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« Reply #1 on: 05.06. 2011 01:35 » |
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Was'nt me but I do have a good condition long stroke head complete with valves and springs for sale if anyone is intersted. PM me
Cheers
Alan
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terryk
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Townsville Queensland Australia
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« Reply #2 on: 05.06. 2011 09:26 » |
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I dont think they are the correct carbs it says 276 but Star Twin longstrokes had 275 carbs.
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1951 A10 plunger, 1958 A10 super rocket, 1948 A7 longstroke, 1951 A7 plunger, 1940s M21, WDM20, 1948 B33, 1949 b31  |
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LJ.
Peterborough UK.
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The Red A10!
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« Reply #3 on: 05.06. 2011 20:40 » |
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Your quite right about that Terry as my manifold had a sort of recess that made fitting of 276s difficult, I got round it by using some tufnel spacers. Looking at the carb & head set up that was just sold there appears to be no spacers... Maybe this might be a late manifold made for the 276s?? I'm wondering now how long the twin port longstroke heads were made for.
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Ride Safely Lads! LJ. ********************** 1940 BSA M20 500cc Girder/Rigid- In Bits! 1947 BSA M21 600cc Girder/Rigid-Green 1949 BSA A7 500cc Girder/Plunger Star Twin-Black 1953 BSA B33 500cc Teles/Plunger-Maroon 1961 BSA A10 650cc Golden Flash-Blue 1961 BSA A10 650cc Golden Flash-Red |
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trevinoz
Newcastle, N.S.W. Australia.
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« Reply #4 on: 06.06. 2011 00:08 » |
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LJ,
All of the long stroke heads were two port.
The ST head had the ports machined to accept the projections on the manifold as were the carbys.
Trev.
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Brian
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Mt Gambier, South Australia.
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« Reply #5 on: 06.06. 2011 04:25 » |
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Heres a pic showing what Trev means about projections.
You will be able to see the two spigots or tubes in the inlet manifold. These tubes protrude in to the head and into the carby's. Both carby's and the head have recesses in them to accept these projections.
Only the Star Twin has these, the carby and the head on a normal longstroke A7 are the normal flush fit.
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rum558m
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« Reply #6 on: 11.06. 2011 20:25 » |
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apologies, twas me that bought them, had to at that price.they are a matched pair of 275's with original fuel connections and pipes. my 49 star twin has a single monoblock on at the mo which spoils it.
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muskrat
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Lake Conjola NSW Oz
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« Reply #7 on: 11.06. 2011 23:48 » |
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G'day rum558m, welcome to the forum.
Good score, your ST will love you for it.
Now tell us about you and your ST.
Cheers
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Only young once, immature forever. Now how can I make this go faster. '51 A7 plunger, '57 A7SS now A10, '71 A65 Lightning (gone to god) '76 XT500, '83 CB1100F, next project a '64 A65. |
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rum558m
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« Reply #8 on: 12.06. 2011 01:59 » |
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Hi im in heckmondwike,west yorkshire. i bought the bike 2 years ago as a rough old thing missing various parts(including carbs). i fitted a new monoblock and a pair of silences along with other bits and pieces and have run it since unrestored and covered about 2000 miles! with very little gone wrong.i will upload a picture when i get chance.
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LJ.
Peterborough UK.
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The Red A10!
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« Reply #9 on: 12.06. 2011 11:07 » |
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Congratulations Rum! Indeed that was a good price, You will enjoy the twin carb set up although dont expect any increase in performance, the set up is really only cosmetic and an interesting talking point. With some time and patience the setting up is not difficult. I find on tickling my carbs (both the same time) start up is often a bit lumpy untill they even out. We look forward to hearing more about the bike soon along with some photographs!
Cheers
LJ.
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Ride Safely Lads! LJ. ********************** 1940 BSA M20 500cc Girder/Rigid- In Bits! 1947 BSA M21 600cc Girder/Rigid-Green 1949 BSA A7 500cc Girder/Plunger Star Twin-Black 1953 BSA B33 500cc Teles/Plunger-Maroon 1961 BSA A10 650cc Golden Flash-Blue 1961 BSA A10 650cc Golden Flash-Red |
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rum558m
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« Reply #10 on: 12.06. 2011 17:17 » |
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daft question but why did they fit the twin carbs?i read they dont improve performance,was it for economy?or maybe just because they could perhaps? regards, Joe
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