Sir John Posted May 16, 2007 Share Posted May 16, 2007 I'm looking for Instructions for an OS MAX 40 SR, Carbburettor Settings.Can anyone help?Thanks in advance,"Sir" John. Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted May 18, 2007 Share Posted May 18, 2007 I'm not sure you will find instructions, I have a 25 year old 40SR that was in my Wot 4 until recently, what do you need to know? Quote Link to comment Share on other sites More sharing options...
Colin Hostler Posted May 19, 2007 Share Posted May 19, 2007 Nothing to it really, just turn out main mix about 2 turns then put a piece of fuel tubing onto fuel nipple now blow on fuel tubeing whith carb set about tick over position and turn low end mix until you can only just hear a slight squeak. Start the engine and fine tune in the normal way. Good luck Colin. Quote Link to comment Share on other sites More sharing options...
Sir John Posted May 20, 2007 Author Share Posted May 20, 2007 Hallo Danny and Colin,First of all many thanks for replying to my query. Now where I need some help is as follows, in reversing the throttle lever, I mistakenly changed the setting on the screw in the middle, and now I cannot remember how many turns I changed it!!Oh! Oh!Anyway if either of you can help, thanks in advance.Sir John. Quote Link to comment Share on other sites More sharing options...
Myron Beaumont Posted May 20, 2007 Share Posted May 20, 2007 Your "screw in the middle" as you put it! won't affect running the engine at above about ,I would guess 1/4 to 1/3 throttle setting. Get the main jet setting so the engine runs reasonably (preferably on the rich side if running in according to the destructions)Then you can experiment with the offending screw to get a nice idle .I am only guessing but start off with one turn from closed & be gentle if you screw it all the way in to find the datum for the one turn .Probably an owner will give you an exact starting point to get your idle started.Hope it helps .! Quote Link to comment Share on other sites More sharing options...
Sir John Posted May 20, 2007 Author Share Posted May 20, 2007 Hi Myron,Many thanks for your advice and help, I will try it out.Bye and safe landings.Sir John. Quote Link to comment Share on other sites More sharing options...
Danny Fenton Posted May 20, 2007 Share Posted May 20, 2007 I have just checked mine and it is exactly 2 turns out from fully in. The way you know this setting is correct is to get the motor set correctly on the main needle (I assume it is run in, if not get that out of the way first) then drop the speed to idle give it 5 seconds then open the throttle up if it stammers and hesitates to pick up then the idle needle is rich, screw it in 1/8. If the engine immediately stops when opening the throttle from idle, then it is too lean, the reverse is require, ie open the idle needle 1/8. This jet is more sensitive than the main needle. Always give the engine a good blast at full throttle after changes and before testing the throttle pickup again. Quote Link to comment Share on other sites More sharing options...
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