lizzie40f Posted September 1, 2009 Share Posted September 1, 2009 i have a dt125lc that has an intermittent fault which is sometimes it starts and runs fine but other times it starts very lumpy and keeps cutting out then backfires,i have cleaned out the carb but it made no difference when it is just about running it wont rev up then cuts out and backfires,also i am not sure but i had the cover off the left side of engine and the stator wheel spins when its struggling to run then when it cuts out the wheel spins the opposite way and if you still have kick start down it kicks back up any ideas guys Link to comment Share on other sites More sharing options...
wild foamy Posted September 1, 2009 Share Posted September 1, 2009 if the engine is running backwards then that would explain the lumpy starting/running, could be caused by extremely advanced ignition timing causing the fuel mixture to pre-detonate and the engine to run backwards, i used to have this trouble when hand-starting model aircraft engines, a common remedy was to open the throttle and drop it back to idle very quickly which would usually cause the engine to start running the correct way again, this may not work with heavier petrol engines though check and reset your points, give your carb a clean, replace your reeds and spark plug/HT cap and lead Link to comment Share on other sites More sharing options...
JimR Posted September 2, 2009 Share Posted September 2, 2009 i have a dt125lc that has an intermittent fault which is sometimes it starts and runs fine but other times it starts very lumpy and keeps cutting out then backfires,i have cleaned out the carb but it made no difference when it is just about running it wont rev up then cuts out and backfires,also i am not sure but i had the cover off the left side of engine and the stator wheel spins when its struggling to run then when it cuts out the wheel spins the opposite way and if you still have kick start down it kicks back up any ideas guys Hi & to the forum you dont state the age of the bike but if its an early 80's model it sounds like you have a pulse coil on the way out Regards Jim Link to comment Share on other sites More sharing options...
lizzie40f Posted September 2, 2009 Author Share Posted September 2, 2009 hi jim thanks for the welcome you say it sounds like a pulse coil can you tell me is that the coil mounted under the tank with 1 wire or is it something in the engine behind the stator wheel ok i have had another look at the bike which is a c reg 1985 dt 125lc,i have checked and cleaned the reeds which wasnt that bad,trying to kick the bike over and it is definately bouncing back the other way as i nearly had my foot broken when it kicked back and the last time it kicked back so hard the kickstart has gone past it stop point and is sitting on the casing so i now have to take the caseing off to see whats broken in there.i have a spark at the plug and petrol yet it will run rough for a second then kick into reverse any ideas guys as this is driving me mad Link to comment Share on other sites More sharing options...
lizzie40f Posted September 2, 2009 Author Share Posted September 2, 2009 Hi & to the forum you dont state the age of the bike but if its an early 80's model it sounds like you have a pulse coil on the way out Regards Jim hi jim thanks for the welcome the bike is a c reg 1985 dt125lc ,can you tell me where the pulse coil is ? is the one under the tank with one wire or is it in the engine under the stator wheel somewhere.The engine is definately kicking into reverse as it has now broke the kick start which has gone back too far and sits on the caseing i dont understand how an engine can change direction thanks for your help dave Link to comment Share on other sites More sharing options...
JimR Posted September 2, 2009 Share Posted September 2, 2009 hi jim thanks for the welcome the bike is a c reg 1985 dt125lc ,can you tell me where the pulse coil is ? is the one under the tank with one wire or is it in the engine under the stator wheel somewhere.The engine is definately kicking into reverse as it has now broke the kick start which has gone back too far and sits on the caseing i dont understand how an engine can change direction thanks for your help dave Hi Dave, the pulse coil is in the mag and feeds the red/white wire. If this small coil get confused the timing will always be out ... the part number you would need is 3M2-85580-20. The reason the engine striking back is due to the ignition timing being incorrect. Wait till you get a big 4 stroke single Regards Jim Link to comment Share on other sites More sharing options...
lizzie40f Posted September 2, 2009 Author Share Posted September 2, 2009 Hi Dave, the pulse coil is in the mag and feeds the red/white wire. If this small coil get confused the timing will always be out ... the part number you would need is 3M2-85580-20. The reason the engine striking back is due to the ignition timing being incorrect. Wait till you get a big 4 stroke single Regards Jim hi jim pulse coil that sounds right do you know where to get one as i have searched but not found anything for my bike thanks for your help dave Link to comment Share on other sites More sharing options...
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