fourex Posted November 22, 2017 Share Posted November 22, 2017 I have recently bought a 1976 Sherpa T 350 model 183 which I have not yet taken delivery of due to it being in transit from a few thousand kilometres away, should see it soon. The pics I have of it, show it wearing a Mikuni or a TMK or something. Basically, I want to return it to std once it arrives and I have a worn Bing T84 (28mm) that I just bought on flea-bay that I want to refurb and fit to this bike, I know that this will require new inlet/outlet rubbers but they are easily sourced from places like in-motion. Question is for any aficionados, what jetting would one recommend for this model with the Bing 28 mm ? I have a copy of a model 191 owners manual that someone gave me that states the following jet sizes............ Slide= 5 Needle=1(position 2) Needle jet= 2.73 Main jet= 125 Pilot Jet=35 - 65 Do these numbers sound right? Most of this stuff is still available but quite expensive so I would like to try and get it right 1st time, that pilot jet sizing is non-committal (35 - 65). I'm in Australia at sea level approx and average temp is 20 degrees Celsius if this helps. Any advice appreciated. Quote Link to comment Share on other sites More sharing options...
bullylover Posted November 23, 2017 Share Posted November 23, 2017 Hi Fourex. If you can wait until Saturday I`m going out to Upper Brookfield where I have a Bing sitting on a shelf off a M199 or I can pull one off a M199A or a M199B and get all the jet sizes for you. You can only buy 0 slides now too so you will have to file a new one to suit. I`m in the same area as you so the jetting off these bikes should be what you need. Graham. Quote Link to comment Share on other sites More sharing options...
model80 Posted November 23, 2017 Share Posted November 23, 2017 (edited) I'd stick with the Mikuni. Bings are incredibly fickle and in my experience go out of tune very quickly. Edited November 24, 2017 by model80 1 Quote Link to comment Share on other sites More sharing options...
2stroke4stroke Posted November 23, 2017 Share Posted November 23, 2017 I seem to recall hearing that the Comerfords supported guys were putting a new slide in the Bing every four events to keep 'em in tune. 2 Quote Link to comment Share on other sites More sharing options...
carl ekblom Posted November 26, 2017 Share Posted November 26, 2017 (edited) Hello This is what I found in my Bing carb for my 199B Idle 45 Needle jet 2,73 Main 123 Markings on throttle valve and needle are difficult to understand but needle was in 2nd position from top. Edited November 26, 2017 by carl ekblom 1 Quote Link to comment Share on other sites More sharing options...
fourex Posted November 28, 2017 Author Share Posted November 28, 2017 Thanks all, I think I have enough info now on the old Bing. Cheers. Quote Link to comment Share on other sites More sharing options...
fourex Posted December 31, 2017 Author Share Posted December 31, 2017 Sorry, I thought I had all the info I needed, but........... Should there be a spring on the air screw ? I've fitted a new 'O' ring to my air screw but should a spring be their also ? Quote Link to comment Share on other sites More sharing options...
bullylover Posted January 2, 2018 Share Posted January 2, 2018 Hi fourex. As far as I can remember there is no spring on the air screw on the Bings or on the Amals. The o-ring holds therm firm. Graham. 1 Quote Link to comment Share on other sites More sharing options...
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