micky Posted September 13, 2007 Report Share Posted September 13, 2007 Dear All, I am looking for help again! Could anbody tell me a good starting point for thr mixture screw on my Majesty 320, I have just fired her up after an extensive rebuild and she only seems happy with half to threequarters of a turn out, is this ok or should i start looking for an error in the rebuild? I am running a very strong (25-1) oil mix in the first tank full as the bike has not been run for 16 years but she did start second kick! Quote Link to comment Share on other sites More sharing options...
micky Posted September 13, 2007 Author Report Share Posted September 13, 2007 Dear All,I am looking for help again! Could anbody tell me a good starting point for thr mixture screw on my Majesty 320, I have just fired her up after an extensive rebuild and she only seems happy with half to threequarters of a turn out, is this ok or should i start looking for an error in the rebuild? I am running a very strong (25-1) oil mix in the first tank full as the bike has not been run for 16 years but she did start second kick! One more thing I forgot! She seems very noisy on the top end at very low tick over, and vibrates the whole frame ,with a few revs she seems to settle and sounds sweet. Quote Link to comment Share on other sites More sharing options...
andy.t Posted September 14, 2007 Report Share Posted September 14, 2007 (edited) Hi, dont know if this info is of any use,when I rebuilt my TY175 I found the mixture screw did very little it was only when I fitted a new/old stock carb that I found I could set up the slow running spot on,I think it was down to worn jets all round in the old carb that prevented setting up,the point is that if the jets are worn or the float bowl not set to the correct height then there probably isn't an exact setting to start with on a worn carb.As you probably know the setting given is only a start point and the best position is that which gives the fastest idle speed.If the slow running mixture is incorrect then it will rattle on tick over.Is the Timing spot on also? Regards Andy. Edited September 14, 2007 by Andy.T Quote Link to comment Share on other sites More sharing options...
micky Posted September 14, 2007 Author Report Share Posted September 14, 2007 Hi, dont know if this info is of any use,when I rebuilt my TY175 I found the mixture screw did very little it was only when I fitted a new/old stock carb that I found I could set up the slow running spot on,I think it was down to worn jets all round in the old carb that prevented setting up,the point is that if the jets are worn or the float bowl not set to the correct height then there probably isn't an exact setting to start with on a worn carb.As you probably know the setting given is only a start point and the best position is that which gives the fastest idle speed.If the slow running mixture is incorrect then it will rattle on tick over.Is the Timing spot on also?Regards Andy. Thanks Andy, I have been assuming the carb is not worn, It has not been used for sixteen years. I have not checked the timing, hoping to treat it to electronic ignition so I was just relieved when it fired up. I will check the timing and treat it to a carb service kit........anybody know the correct jet sizes? Sorry for being thick, but could the rattle come from the thing trying to fire too soon (run backwards) on low tick over? Quote Link to comment Share on other sites More sharing options...
mollygreen Posted September 16, 2007 Report Share Posted September 16, 2007 (edited) Dear All,I am looking for help again! Could anbody tell me a good starting point for thr mixture screw on my Majesty 320, I have just fired her up after an extensive rebuild and she only seems happy with half to threequarters of a turn out, is this ok or should i start looking for an error in the rebuild? I am running a very strong (25-1) oil mix in the first tank full as the bike has not been run for 16 years but she did start second kick! Perhaps some of your problems are coming from the amount of oil your using? I have recently fitted a new piston kit and small end to my TY250 and as I run the bike on Amsoil Saber synthetic 2T at 100-1 mixture I broke the engine in on a mixture of 66-1. I have also fitted a new WES two piece silencer system with a SM front pipe. Because the oil/petrol ratio is so lean on oil I found that the bike ran very weak and have raised the needle to clip position 4 from the standard setting of 2, richening the mixture, with the air screw out exactly 1 full turn. Now with these settings and the new exhaust, the bike runs like a sewing machine. I am glad that I aint sat behind you in the sections running your bike at 25-1, you must have ready to lay Bitumen running out of the exhaust. Seriously though try running your bike on less oil, it will respond better to carb set up changes. As for the noisy engine that you mentioned later in this thread, you didn't say whether you were using fin dampers (rubbers) in the barrel. I took all the rubbers out of my barrel when I took it off and cleaned it up. When I put it back together and run it up and started riding it to run it in, I was supprised how noisy the engine top end was and fitted a whole load of new fin rubbers, (as mentioned in a previous topic on this site). This has cut the noise down by about 50% but it still isn't quiet. Lets face it what aircooled Yam is? Most of the rattle is caused by the resonance of the barrel fins and can be reduced by using fin dampers. Edited September 16, 2007 by mollygreen Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.