strongy Posted February 12, 2003 Share Posted February 12, 2003 Just tinkering around today and noticed that there was a very slight wobble on the carbs (40's) to the engine block. I thought maybe this could create an air leak resulting in a lack of suction for the carbs, so I gave each carb securing nut about a half turn. Engine now runs fine (it was a bit lumpy mid range yesterday - not now), but I notice that the idle speed when warm has now gone up to 1150 rpm up from its usual 1000rpm does this matter?/ should I bring it back down to 1000rpm? 🤔 I am always a bit hesitant about messing with the settings on the carbs because I do not want to create a greater problem and end up getting the whole lot re-set. Any suggestions 🤔 Cheers Strongy - go on, wake the neighbours. 😬 Link to comment Share on other sites More sharing options...
Graham Perry Posted February 12, 2003 Share Posted February 12, 2003 Slight movement between carbs and Manifold is correct, see the archives as its been discussed a lot. Movement between the manifold and the block isn't so tighten that up. Tickover should be 800-1000 ish Link to comment Share on other sites More sharing options...
pete east Posted February 12, 2003 Share Posted February 12, 2003 Previous poster is correct I understand that if carbs are done up too tight vibration can cause frothing in float chambers - The method I was shown was to nip up the nuts so that the metal washers just grip a penny coin placed between the metal washers which contain the rubber grommets. Link to comment Share on other sites More sharing options...
strongy Posted February 12, 2003 Author Share Posted February 12, 2003 Sorry my description was mis-leading the movement was between the carbs and the manifold so I will go back out and slacken it again. When you say silight movement is correct, is there a torque setting? or do I just allow a slight wobble? Cheers Strongy - go on, wake the neighbours. 😬 Link to comment Share on other sites More sharing options...
Peter T Posted February 12, 2003 Share Posted February 12, 2003 Depends on wether you have Thackary washers or Rubber bobbins holding your carbs on. Thackary-------75" Between coils. Bobbins---------1, 1-5mm Between metal washers. Power Freak member! Link to comment Share on other sites More sharing options...
Joe 90 Posted February 12, 2003 Share Posted February 12, 2003 If tightening them up has smoothed the idle and raised it, then it was probably the correct thing to do. Adjusting the idle is a simple, and shouldn't interfere with anything, so can be considered "safe". 99,700 miles so far Link to comment Share on other sites More sharing options...
YW Sin Posted February 13, 2003 Share Posted February 13, 2003 after adjusting the movements, also check the air flow balance between the two carbs. A ll standard, Classic 1.7 X-flow Link to comment Share on other sites More sharing options...
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