Fast Eddie
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- Oct 4, 2013
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annajeannette... you are replying to comments posted in 2012... by a member not seen on the forum since 2015...
Most likely that the Mercury was a stopgap to use up the remaining feartherbed stocks. Why touring Trim?, a likely explanation is that they did not have/could not afford the Expensive deep valenced chrome guards so reverted to the cheap light painted guards and painted case ,a single carb fits well with that image. Can't imagine that they would have commissioned a batch of LC pistons just for that. Even if there is somewhere an "Official" explanation I would take it with a pinch of salt as they were past masters in propaganda.
I'm pretty much in agreement with NB.
The 650 components readily available to assemble this slimline should be fairly straight forward.
There are several examples of 06-0380 head cores originally intended for commando, as being finish machined as small bolt pattern, small combustion chamber, no spigot counterbore, and featherbed top of head oiler, regular 1.4" intake valves instead of 750/1.5" .
SS cam like ALL NHT of that period(61-70). crank, rods, cases (finished for small bolt pattern barrels) only difference is the flywheel.
All you need to do is reintroduce the 1x2 intake manifold from the early atlas.
Turn it over to the marketing department and bingo, touring bike.....LOL
"I understand the 650ss changed over to larger concentric carbs late in its run, and therefore the Mercury too? Is there a measured power loss? Many say their Dommie "runs better/stronger/faster/louder with monoblocs", but what's the data, if any?"
I would love to own that bike. It would be a real buzz. Most people probably do not see in it what I see. A 650 can be better than an 850/I'm currently looking for the same info. What are the induction differences between years of 650SS. Some of the 650 inlet tracts I've seen have had tube reducers. What was the hot induction setup for period race 650SS-based Domi bikes?
Of that I am certain.Most people probably do not see in it what I see.
STOP, Stop with the BS.I think a lot depends who was working in the factory. It is probably almost impossible to improve on the head design of the Manx and still stay two valve. The guys who build race bikes probably do not usually adjust their thinking to cater for road bikes. That is the reason Peter Williams suffed-up the steering geometry on the first Commandos. It would be interesting to get one and fit a steering damper.
In the old days, it was thought that steering dampers were used to fix bad handling. That race steering is very different to road steering.
and BSA SuperRockets were never twin carb....or fast.
There is an optional a10 twin carb head that BSA offered in the parts catalogue. These are very rare and expensive today.
According to those that have fitted it, it adds no power. I guess it isnt a good design.
Glen