john g Posted February 5, 2006 Share Posted February 5, 2006 Started the engine (1600x/f) of the 7 to warm the oil, everything OK. Dropped the oil & changed the filter. Started the car & one carburettor sounded ‘flat’. Let the engine warm up & still the carburettor sounded flat. Turned the idling mixture adjusting screws on the problem carburettor & there was no change. (I screwed them all the way in & even screwed them all the way out). Removed & cleaned the idling jets & the main jets. Replaced them and everything was OK again but when I adjusted the idling mixture screws the engine note didn’t change? (It does on the other carb). (I haven’t tried it on the road yet). Anyone any ideas? Link to comment Share on other sites More sharing options...
Big Brother Posted February 5, 2006 Share Posted February 5, 2006 Have you balanced the carbs? I'd check this first. Steve SE7EN-UP! Incorporating the Caterham Links Database Link to comment Share on other sites More sharing options...
john g Posted February 5, 2006 Author Share Posted February 5, 2006 Steve, how do I do that? I have a carb balancer - which screws are the balancing screws? Link to comment Share on other sites More sharing options...
Big Brother Posted February 5, 2006 Share Posted February 5, 2006 The balancing screw is located on the spindle between the two carbs. (close to where your throttle cable connects) Remove the air filters and then put your balancer on one of the two chokes of one of the carbs (if you see what I mean) and note the reading. Then try the other carb and see what you get. By adjusting the balance you may need to reset the idle speed. Take a look here for a great guide to tuning Webers. Steve SE7EN-UP! Incorporating the Caterham Links Database Link to comment Share on other sites More sharing options...
john g Posted February 5, 2006 Author Share Posted February 5, 2006 Cheers Steve, will give it a go. (Have seen the info thanks). Link to comment Share on other sites More sharing options...
Normans_Ghost Posted February 6, 2006 Share Posted February 6, 2006 John, if you have a good ear you can balance them with a small rubber pipe (bleed pipe is good) and get the sound the same. Norman Verona, 1989 BDR 220bhp, Reg: B16BDR, Mem No 2166, the full story here You and your seven to The French Blatting Company Limited Link to comment Share on other sites More sharing options...
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