wrcfan Posted September 15, 2014 Report Share Posted September 15, 2014 Hi everyone. I have a 250 2009 Sherco and have had issues with the bike. I was in the middle of an event and the bike refused to start after the lunchtime break after riding no worries for the morning loop. I checked the wiring in the bike and found that the CDI was in a bad way so I ordered a new one and fitted it to the bike. It was getting fuel and air so thought with a new CDI it was spark and that would fix the issue. I wired it all up and kicked the bike, it started and ran so thought that adjusting the carburettor would have it purring nicely and I would be back out riding. Tonight when I went to do this the bike ran great, then after it was warmed up and taken for a quick run up the street it died again. I have taken the sparkplug out and check for spark, it is once again intermittent as it was before with the old CDI installed (we have more spark now than before however). The bike was re-wired up and during this we checked the stator (pulled it off and checked every wire which gave good resistance readings). I am at my wits end and unsure where to go from here as with stator appearing to be fine, and a new CDI the spark shouldn't be an issue. I have been using brand new plugs in it over the last two nights when the bike has been running again. It is mixed on a 80:1 ratio and has also had the carburettor taken off, cleaned and blown out with compressed air Any ideas on what the issue could be would be very much appreciated. Cheers Aaron Quote Link to comment Share on other sites More sharing options...
gasgas249uk Posted September 15, 2014 Report Share Posted September 15, 2014 I think you can forget the carb . It's def a spark issue. I'm guessing you coil is built into the CDI and add you've replaced it it shouldn't be at fault.Perhaps your pick up on the stator is working intermittently. If you plug lead is good then I'd be sending the stator off. Forgetting your resistance readings for one moment why dont you check your stator output readings. They should be very healthily over 13 volts Quote Link to comment Share on other sites More sharing options...
copemech Posted September 16, 2014 Report Share Posted September 16, 2014 Call Splatshop for an exchange stator if you have checked the earths and connections. Transistors in there go tits up! Quote Link to comment Share on other sites More sharing options...
wrcfan Posted September 17, 2014 Author Report Share Posted September 17, 2014 Will go digging in there a little more and then if things aren't looking good will then look at getting a new stator. I am based in New Zealand and wondered whether the exchange stator deal exists for those outside of the UK? I am more than happy to shoot my one to the UK if they do international shipping on the exchange ones. Thanks for the help guys, seems like it must be the stator as the cdi is brand spanking new so I presume the lack of spark could be the stator on it's last legs. A friend mentioned to me that the stator doesn't have anything to do with the spark on startup (I am not at all technical so am relying on advice and info on this issue), and wondered whether this advice had any truth to it? I would expect that a dud stator would indeed mean the bike won't go. If anyone can set me straight on this would be great too. Cheers! Aaron Quote Link to comment Share on other sites More sharing options...
tony27 Posted September 17, 2014 Report Share Posted September 17, 2014 Send me a pm of your address Aaron & I'll loan you a brand new 05 stator to try, I'm in palmy so you could have it in a couple of days. I have an old stator you could send over to have rewound if needed, Splatshop will do you an exchange stator if you make sure that your's arrives in good shape to be rewound Quote Link to comment Share on other sites More sharing options...
dadof2 Posted September 17, 2014 Report Share Posted September 17, 2014 Your friends advice is not accurate. The stator output is needed at starting and all times. Resistance readings are not the most accurate or suitable way to check electrical components, they can find some faults so long as you are aware of their limitations. The only way is to spin the motor with a power drill and check the outputs with an oscilloscope. Any half decent auto electrician should now have an oscilloscope. Just for your general info most modern trials bike stators contain 3 main items: 1) Several coils with thick wire to generate power for your fan, horn and lights. Individually they give AC outputs 2) A single coil with very fine windings, this is the source could for your ignition power / spark. AC output 3) A sensor to detect the position of the engine to time the firing of these spark. These are usually a small black thing and are not always on the stator, may be just outside the flywheel. There are two common types of these sensor, one gives an AC output (sinusoidal waveform) and does not contain transistors, the other (as in your Sherco I think) contains "transistors" and gives a square wave output. Quote Link to comment Share on other sites More sharing options...
wrcfan Posted September 17, 2014 Author Report Share Posted September 17, 2014 Thanks very much Tony! PM sent, I am also based in Palmy myself. Look forward to hearing from you. dadof2 - Thank-you for that information. I was a bit skeptical on my friends advice, and much prefer the advice of those on the forum. Great to know, I am new to the world of trials and this is my first motorcycle I have owned so learning about things slowly. Cheers for that! Quote Link to comment Share on other sites More sharing options...
copemech Posted September 18, 2014 Report Share Posted September 18, 2014 Tony, I fear your '05 stator will not work on the lads "09 bike! Quick look on Splatshop site indicates he may wall need the longwire dualmap as listed on the third page here, ans also appears Chris is without at the moment, which means a new one for addidtional $100 or send his orig to Motoplat UK directly. Follow the pics of the original and compare carefully before choosing a new/rebuilt unit as years and models vary widely! http://www.splatshop.co.uk/sherco/electrical.html?p=1 1 Quote Link to comment Share on other sites More sharing options...
tony27 Posted September 18, 2014 Report Share Posted September 18, 2014 (edited) The thought occurred to me as well, turns out he lives really close to me so I can run him through the test procedure etc & help him out if needed I haven't managed to ride any of our local trials this year as they always seem to be around nightshift & I really can't afford to take 2 days leave to do something I'm not enjoying as much as previously & Aaron is a new rider this year Edited September 18, 2014 by tony27 1 Quote Link to comment Share on other sites More sharing options...
wrcfan Posted September 18, 2014 Author Report Share Posted September 18, 2014 I just checked splatshop for the stator that is sitting in my bike at the moment and this is the one I have. I am starting to wonder whether my 09 is actually something else? It was advertised as an 09 though....I did think it was a little odd as this is what is in the bike now: http://www.splatshop.co.uk/sherco-leonelli-stator-assy.html yet when I searched Splatshop for an 09 stator they looked quite a lot different. Im a little puzzled, although Tony if your one looks the same as the link above then it will fit my bike. Cheers Aaron Quote Link to comment Share on other sites More sharing options...
copemech Posted September 19, 2014 Report Share Posted September 19, 2014 This would be the plate(only) then for a UK spec '09 without dual map. Be sire wires exet through hole rather than slot! http://www.splatshop.co.uk/leonelli-new-stator-assy.html Quote Link to comment Share on other sites More sharing options...
tony27 Posted September 19, 2014 Report Share Posted September 19, 2014 Here's a couple of photos of my spare, never been fitted & lives in my gearbag just incase 1 Quote Link to comment Share on other sites More sharing options...
wrcfan Posted September 19, 2014 Author Report Share Posted September 19, 2014 That looks like exactly what I am after to check the bike! Shall see you at 5:30 mate. Many thanks! Aaron Quote Link to comment Share on other sites More sharing options...
wrcfan Posted September 21, 2014 Author Report Share Posted September 21, 2014 Bit of an update on this one for anyone who comes across the thread. Turns out it was the stator that had died. I would like to give a massive thanks to Tony for his kind offer to give me his stator, I will get another new one off Splatshop to return to him so I am back riding even quicker than anticipated. Also thanks to everyone for chipping in on the thread so far, lots of helpful people here and that is mirrored by the people I have met so far too. As a newbie to the trials world all the support is fantastic and has encouraged me a lot. So now the bike now runs better than it ever has, starts first kick so shall look forward to getting back out there and continuing to learn. Cheers! Aaron 1 Quote Link to comment Share on other sites More sharing options...
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