Diamond Geezer Posted May 19, 2022 Share Posted May 19, 2022 Hi Everyone anyone got a starting point for this carb I have cleaned it needle valve is fine it runs up to ull revs but as I comedown to about quarter throttle it slowly dies can’t get it to tick over. Quote Link to comment Share on other sites More sharing options...
Peter Christy Posted May 19, 2022 Share Posted May 19, 2022 I think you need to be a bit more specific. Is it a (German) Webra Blackhead or an Austro-Webra (Austrian). Is it a Dynamix carb or the twin needle one? A picture of the carb would help. -- Pete Quote Link to comment Share on other sites More sharing options...
Nigel R Posted May 19, 2022 Share Posted May 19, 2022 Same Webra 40 as this? As PC says, photo of the carb would do wonders. Adjustments worked in reverse on dynamix (I think) so it makes a difference to the replies! Quote Link to comment Share on other sites More sharing options...
Diamond Geezer Posted May 19, 2022 Author Share Posted May 19, 2022 Same as what Nigel Quote Link to comment Share on other sites More sharing options...
Diamond Geezer Posted May 19, 2022 Author Share Posted May 19, 2022 Same as what Nigel Quote Link to comment Share on other sites More sharing options...
Alan Gorham_ Posted May 19, 2022 Share Posted May 19, 2022 47 minutes ago, Diamond Geezer said: Same as what Nigel Same as the thread you posted on Saturday on the same subject that Nigel has linked to? Quote Link to comment Share on other sites More sharing options...
Diamond Geezer Posted May 19, 2022 Author Share Posted May 19, 2022 Yep Quote Link to comment Share on other sites More sharing options...
John Wagg Posted May 19, 2022 Share Posted May 19, 2022 Have you tried a different glow plugs ? Quote Link to comment Share on other sites More sharing options...
J D 8 Posted May 19, 2022 Share Posted May 19, 2022 Those Webra dynamix carbs good while new but vibration would wear the rather convoluted link and sliding block upsetting the running. My Blertiot XI has a Webra 61 of the same type fitted when the aircraft was built in the 70's. However the carb has been replace with a more modern twin needle carb [ SC I think ] On which it runs very well through the speed range. 1 Quote Link to comment Share on other sites More sharing options...
Peter Christy Posted May 20, 2022 Share Posted May 20, 2022 'Fraid my only experience is with the TN carbs, but I can suggest a "standard" setup that works with most carbs that don't have a separate air-bleed for idle adjustment. First, attach a length of fuel tube to the inlet (to blow through). Open the main needle a turn or two wider than the running setting, then: Close the barrel to the point where a pin is just trapped between the barrel and the carb body (ie: almost, but not quite fully closed). Adjust the idle needle until you can JUST hear a faint hiss when you blow down the fuel line. This will generally get you in the ball park for most carbs that use a twin needle design, with no airbleed. The Dynamix had a reputation for being tricky to set correctly, but working very well once you found the "sweet spot". -- Pete Quote Link to comment Share on other sites More sharing options...
Diamond Geezer Posted May 20, 2022 Author Share Posted May 20, 2022 Thanks for all your help I’ll persevere if not try another carb and I have changed the plug . Quote Link to comment Share on other sites More sharing options...
Engine Doctor Posted May 20, 2022 Share Posted May 20, 2022 They were problematic carbs , as mentioned earlier they were reasonable when new but wore quickly due to vibes . If you can find a modern twin needle carb it will be a lot better. Just make sure the spigot size is the same or find a mate to make an adaptor . 1 Quote Link to comment Share on other sites More sharing options...
Diamond Geezer Posted May 20, 2022 Author Share Posted May 20, 2022 Cheers Phil Quote Link to comment Share on other sites More sharing options...
kenb Posted May 26, 2022 Share Posted May 26, 2022 Hi. If you still need help with your dynamix carb ,there's an article written in one of the mags about 1981 ,"webra dynamix carburetor beast or beauty? By Robert H Munn. I think it can still be found on line,but if you have any probs pm me & I will gladly send you a copy by post. Kenb Quote Link to comment Share on other sites More sharing options...
Diamond Geezer Posted May 26, 2022 Author Share Posted May 26, 2022 Hi Ken Would this be in rcme Quote Link to comment Share on other sites More sharing options...
extra slim Posted May 26, 2022 Share Posted May 26, 2022 Dynamix pdf Quote Link to comment Share on other sites More sharing options...
kenb Posted May 27, 2022 Share Posted May 27, 2022 It was one of the American mags early 1981. E S has linked to the article. Quote Link to comment Share on other sites More sharing options...
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