the real muddy90 Posted February 21, 2010 Share Posted February 21, 2010 Firstly, sorry if this has been done to death already The missus has a 1970 2+1/4 petrol 11a,which since we bought it hasn't run very well at all. At first it wouldn't tick over without the choke out, the Webber was stripped & cleaned of silt & the idle jet unblocked : I think I've got it ticking over right now but when we try to get any power it just dies. History... The fuel tank has been changed because it was full of rust, lift pump stripped & cleaned (new anyway),new condencer, points adjusted (correctly I think!), newish plugs & points (although the plugs appear to be the wrong type). So, I'm suspect of the carb still & maybe the dizzi (vacume & mechanical advance?). I could just buy anouther Webber & fit that but would like other options???? I don't know if it had a Zenith or Solex originaly,is there any way of telling? I'm not fussed about economy (webber!) as it's a trials toy. I also have a choice of what to do about the dizzi..... Strip & rebuild? Buy new, but points or electronic??? Anyone have experiences? Quote Link to comment Share on other sites More sharing options...
Rich_P Posted February 22, 2010 Share Posted February 22, 2010 Does it rev freely with no load applied to it? What did you set the gap to on the points? For "what carb" question, the Solex wasn't fitted to the later 2A models. It'll have had Zenith from factory. There are ways of fitting more exotic carburettors to these engines, like an SU or twin choke Weber if you fancy either. Quote Link to comment Share on other sites More sharing options...
the real muddy90 Posted February 22, 2010 Author Share Posted February 22, 2010 Yeah, it revs lovely when stood still Can't remember points gap. When it gets to about 40-45mph it goes into kangaroo petrol mode, & on a trials section when you ask for power it goes pweeor & dies It just needs to go when asked, not fussed about economy & I want simplicity. Quote Link to comment Share on other sites More sharing options...
Rich_P Posted February 22, 2010 Share Posted February 22, 2010 I think if the timing failed to advance the power would just fade away, and wouldn't cause kangarooing. I think the problem lies in fuelling, either to the carb or the carb itself. Have you checked the fuel pump's "silt container"? That may be full and causing fuel starvation. If the fuel tank was rusty as you say, debris could have entered into the fuel pickup and fuel pipes. Quote Link to comment Share on other sites More sharing options...
discomikey Posted February 23, 2010 Share Posted February 23, 2010 have you replaced all the fuel lines/blown them out with an airline? Quote Link to comment Share on other sites More sharing options...
henrycrabbe Posted February 23, 2010 Share Posted February 23, 2010 I'd go with fuel starvation too. I had an Escort some years ago that I rebuilt the webber carb on (badly) and didn't fit the needle valve properly so that the float chamber was very nearly empty before it let any more fuel through. Symptoms were like yours, it would rev freely with no load and drive steadily OK, but if you asked it to do anything that needed power (& fuel) it would splutter and die. Steve. Quote Link to comment Share on other sites More sharing options...
the real muddy90 Posted February 24, 2010 Author Share Posted February 24, 2010 Answers as they come... Cleaned the fuel bowl out twice now it stays nice & clear. No haven't blown lines through. The inline filter (new) before the carb gets fuel but never seems to fill right up?! even disconected it spurts out before it will fill! Strange. It seems like fuel starvation to me too. I did check the float when I stripped it but only for wear & blockages. Quote Link to comment Share on other sites More sharing options...
henrycrabbe Posted February 24, 2010 Share Posted February 24, 2010 Just thinking out loud... Is your fuel tank breather OK? I guy I know had a blocked breather (not on a landy), the fuel pump was struggling to pull fuel through because no air could get into the tank through the breather. It eventually sucked his tank flat! Steve. Quote Link to comment Share on other sites More sharing options...
the real muddy90 Posted February 25, 2010 Author Share Posted February 25, 2010 No there's a thought! Now you mention it, last time I filled up with fuel it spurted back all over me so could well be blocked. Quote Link to comment Share on other sites More sharing options...
Rich_P Posted February 25, 2010 Share Posted February 25, 2010 That's what they do when you fill them right up. The breather/overfill pipe goes straight back up to the filler cap. Try running it with the cap removed from the filler. That will prevent a vacuum forming. Quote Link to comment Share on other sites More sharing options...
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