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Learned a bit more about the Matchbox float chambers, which I had problems with earlier. On the about a dozen Manxes at Goodwood, most had Gardner float chambers, some had SU, no one used a Matchbox.
Learned that in the old days, riders was paid by AMAL for using their carbs. Had to use their float chambers too. So they got half a dozen float chambers, tested flow and used the best one.
Obviously a new made AMAL Matchbox is a close reproduction of the old one. Not usable on tracks with long straights.
Works fine on my 92bore with a bored out Gardiner a 42mm. I can tell you my 92 will drink twice that of your 86. You have to ensure the bore of the feed valve in big enough. And as I said run the fuel level higher than the traditional way of setting the float height.
 

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Met an experienced Manx mechanic from Scotland in the pits at Goodwood. He answered to the question I asked in #8 in the thread. The tabs close to the steering head was fitted on 59 and 60 frames. Why no one knows. They were never used for anything. He kindly answered a lot of other questions ( and offered me a beer to).:)
Those tabs are not on the Reynolds / Norton factory drawing for the 1960 Manx frame. Have worked on 3 x 1960 bikes, 2 x 1959 and no tabs.
 

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Discussion Starter #124
Steve, as you earlier wrote that you use old float chambers after servicing them, I guess that the limited flow ones was thrown in the trash bin decades ago or fixed. From testing we found a great flow difference on different Matchboxes. My bike came with a round bottom feed AMAL, which I have saved with all other replaced parts. When did the Matchbox appear?
Anyhow, as the bike runs well with the Gardner float chamber, I'll stick to it.
So still a mystery about the tabs. Were they there from the factory or added later and why?
 

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Discussion Starter #125
Last practice this year. Went to the track yesterday, took out the bikes to give me place to sleep. Woke up, ice on the car windows. No good temperature to start a bike with R oil. Put the bike into the van. Took some hours to warm up the Norton. Finally out on track. Got a good feeling of the ride. Only problem was fog on the visor, had to have it partially open. Should have taken the helmet with pinlock with me. Second run, forgot that I'm still running in the bike, pushed harder to keep up with the other, the Manx responded well. Went into the pits very happy but very frozen. Though then the temperature had risen to 5 centigrade (41 F). Only remaining problem to solve is that the TTI gearbox is almost impossible to shift up to 5th gear. Have to figure out why. Otherwise only ordinary maintenance.
 

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Discussion Starter #126
Routine service done. Decided not to fit a fairing for the 2020 season ( if there will be one ). Much easier to check and service it with only a flyscreen. And I'm not yet fast enough on it to race it, so I will only parade it.
Worked a bit on other bikes.
First got a BSA ex military unit single, which needed a new electrical system and some other fixes and modifications.
The other one is a BSA Victor Special. Story is that I bought one new in 1970, replacing the Gold Star which I never liked. Sadly it melted down in a barn fire in -83. One of the bikes I really liked, especially on gravel roads. A while ago found another -70 Victor Special in excellent condition. Still looks exactly as when it left the factory, with 6000 miles on the clock. Not much work on that. Can't allow myself to modify anything on that one, except maybe upgrading the electrical system if ever needed.
 
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