not ron Posted February 15, 2010 Report Share Posted February 15, 2010 To help with a machine eligiblity issue can anyone state, with confidence, when the Amal Concentric MK1 and MK2 carburettors were first introduced. Quote Link to comment Share on other sites More sharing options...
wayne_weedon Posted February 15, 2010 Report Share Posted February 15, 2010 A quick google suggests 1966. But can't be certain on that. Wayne... Quote Link to comment Share on other sites More sharing options...
woody Posted February 15, 2010 Report Share Posted February 15, 2010 Hi Clive, your question is a bit open as eligibility regarding these carbs differs for Pre65 / twinshock and region to region. Can't give you an exact date of introduction for the MK1 Concentric but it was late 60s, definitely not before 1965. However, it is ok for Pre65 events even though original fitment for pre65 bikes would have been the monobloc. I don't know of anywhere that won't allow it. I don't think the MK1 1/2 is eligible in any of the main Pre65 events. The MK2 was mid to late 70s introduction and definitely not Pre65 eligible. There are no rules on twinshock carbs so a MK2 could be fitted to any twinshock. Hope this helps although you could probably find definitive dates from the Amal website. Quote Link to comment Share on other sites More sharing options...
sparks2 Posted February 15, 2010 Report Share Posted February 15, 2010 Hi 1966 for the Mk1 Amal concentric. Regards Sparks2 Quote Link to comment Share on other sites More sharing options...
oldmonty Posted February 22, 2010 Report Share Posted February 22, 2010 1968 was the first year that Amal Concentrics were fitted to British road bikes. Triumphs, BSAs and Nortons all had Monoblocs in 1967. Quote Link to comment Share on other sites More sharing options...
trickymicky Posted February 22, 2010 Report Share Posted February 22, 2010 1968 was the first year that Amal Concentrics were fitted to British road bikes. Triumphs, BSAs and Nortons all had Monoblocs in 1967. I have an Amal brochure for the 600 and 900 series Concentric carburettors dated March 1967. The Settings list shows concentrics being fitted to BSA MK3 Spitfire in 1967 Quote Link to comment Share on other sites More sharing options...
feetupfun Posted February 23, 2010 Report Share Posted February 23, 2010 Mk2 1976 (on first Cota 348) Quote Link to comment Share on other sites More sharing options...
oldmonty Posted February 23, 2010 Report Share Posted February 23, 2010 I bought a new BSA in '67 with monoblocs and another in '68 that had concentrics. Both were Canadian models. I own a '67 Triumph Bonneville now that originally had monoblocs. Again, Canadian market. UK models may have been different but I rather doubt it, I was buying Brit mags regularly at that time and I think I would have noticed. Amal may have had brochures out earlier but I don't think concentrics made it onto production bikes until '68. Quote Link to comment Share on other sites More sharing options...
oldmonty Posted February 23, 2010 Report Share Posted February 23, 2010 Trickymicky is correct! I've just been going through my old mags and Motorcycle Mechanics tested a new BSA Sports Bantam in April 1967 which sported the "new" 626 Amal Concentric! I stand corrected! Quote Link to comment Share on other sites More sharing options...
jimmitchell Posted February 23, 2010 Report Share Posted February 23, 2010 Have you contacted http://www.amalcarb.co.uk/news.aspx Jim Quote Link to comment Share on other sites More sharing options...
oldmonty Posted February 23, 2010 Report Share Posted February 23, 2010 The Amal website link is useful, the new adjustable float is long overdue! I thought the float level on the mark 2 on my Montesa was way off and I wasted a lot of time adjusting it by moving the seat and it turned out to be the enricher plunger that was leaking, making it run rich! I poked the seal out of the end and re-installed it upside down and now it's fine! Quote Link to comment Share on other sites More sharing options...
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