steptoe1111 Posted December 22, 2015 Share Posted December 22, 2015 hey guys how is everyone great I hope I thought I broke a piston skirt or a ring and it got stuck in the port or something, cause the engine locked up, but I turned out one of the screws holding my stator plate on had come loose and was tumbling around in there, unfortunately it smashed two of my flywheel magnets it was a mk2 flywheel with the four slots I had put on a "78" motor cause I blew a coil on the old stator , any way I got another coil off a friend of mine and will have to put that back in there so I will be running the stator with the low and high speed coils wich requires the 7 wire cdi wich got damaged when the high speed coil blew I did some research and found out that the high and low speed coil operate as one coil, so could I possibly run a 6 wire cdi on it by connecting those two wires together without blowing it (ive forgotten what the ohms reading are for those two coils I know the high speed is 13ohms and the low speed 4or 5 I think but because those two coils are wired up in parallel according to ohms law you can subtract the value of the low speed coil from the high speed coil and of the top of my head should be within ball park of what the single coil on the later mk2 stator should be 9ohms, so in theory it should work unless the 7 wire is CDI type and the 6 wire is TDI type ? if it wont work I was goin to build a simple diy joby is the engine speed timing advance controlled by the cdi or ive heard some engines use something built into the triggering coil if the timing is operated by the cdi I will need to build this can be done for around 10bucs and has a micro controller that will program a variable time delay on the trigger coil that to operate the advance and retard this site here have the diagrams for what I intend on building if all else fails it has the simple cdi circuit plus the computer controlled advance circuit http://www.sportdevices.com/ignition/ignition.htm#CDI Link to comment Share on other sites More sharing options...
Moderator Cynic Posted December 22, 2015 Moderator Share Posted December 22, 2015 Dont know enough about electronics to argue the details. There may be more to it but if it is that easy and you can use a 7wire mag with a 6wire cdi it would be good info. Cant help thinking your missing something. Fkt if i know what though. Link to comment Share on other sites More sharing options...
steptoe1111 Posted December 22, 2015 Author Share Posted December 22, 2015 yeah me to mate maybe im thinking to much into it, and should just hook it up and see what happens and post the results ... I mean I got 2 X engines that are now cactus..... and for what the bikes are worth over here I could buy another one complet running for the cost of 3 magnetos or cdi units I tried soaking the old cdi in methel ethel keytone "MEK" for a week two see whats goin on inside the 7 wire cdi but.....35 year old cured resin is preety hard to dissolve ill hook it up like I said above tomorrow and post the results that computer controlled timing advance and cdi kit might be the go I think should work on any thing with an ac altanator providing 0-300volts a/c pluss provide 32 degrees of advance the micro controller can be had on ebay for a couple of dollars and every thing else should be avail at the local electronics store 1 Link to comment Share on other sites More sharing options...
steptoe1111 Posted December 23, 2015 Author Share Posted December 23, 2015 played around a bit with it this morn by joining those two coils gave me 6ohms but did not match the 10ohm the later sorce coil mesures , so no I don't think you can run a 7 wire stator off a 6 wire cdi , but you can run a 6 wire stator with the earlier two slot magneto I found out the timing marks on the 6 wire stator don't match, up so im going to have to ballpark the timing to get it running and then put a light on it and time her up "and I actualy put some lock tight on the stator screws this time" 3 Link to comment Share on other sites More sharing options...
steptoe1111 Posted December 28, 2015 Author Share Posted December 28, 2015 well were going again guys, here is a pick of the magneto I smashed the magnets in, just had to be bad luck to do this amount of damage people spin there stators all the time and never had or seen this any way had to mix and match some parts, little bit of stuffing around but all worth it in the end ... any way spent the last hour making this ........ hope this helps others fix or understand more about there ignition timing aswell (stator screw fell out and jammed in the coil gap shatterd two magnets) late model 6 wire stator will run on the early magneto with no probs at all very nicely, but new slot locations need to be drilled in the stator to find tdc, firstly.... I used a dial indicator and measured the piston at 1.8mm BTDC, because im using the original flywheel the marks line up with the casing pull the spark plug out connect it back to the lead and rest it inbetween the fins on the head this should ground the plug secondly.. get your timing light out, you will have to run it off a separate power source like a spare 12v batt, put a 19mm on the flywheel nut connect it to a cordless drill and spin the engine counter clockwise (you will need atlest 200rpm to create a decent spark to fire the timing light) when it does flash you need to find your flywheel TDC mark (wich could be anywhere in most cases) , mark the casing in relation to where TDC on the flywheel is showing under the timing light flash (the diference in alingnment between the two mags notice the diference in the keyways between the two ) thirdly.... once that is done and your new timing mark is there, set the original timing marks back to factory and mesure the distance from you factory TDC mark to the one you made just before with the strobe light, this will tell you how far your stator is out and has to be adjusted! , it pointed me to where some factory scribed holes were located (they obviously used the same plate on lots of diferent models and drilled them accordingly) "as did I" when I rechecked the timing it was dead on ;) i dident need to but............... I like to a have a little bit of adjustment.... so I sloted em THIS IS VERY ACURATE going by eye mine was fireing at 140 degrees BTDC and kicking back when turned her over so this is why I leave the plug out so theres no compresion ..... "also means no broken ankles or kickstarters from kick back or bike screemin off from under you backwards ....... although that would be quite funny to see 1 Link to comment Share on other sites More sharing options...
slice Posted December 28, 2015 Share Posted December 28, 2015 Lot of hard work but very satisfying when it actually runs, well done you. Link to comment Share on other sites More sharing options...
Moderator Airhead Posted December 29, 2015 Moderator Share Posted December 29, 2015 Like it Shaun, well done it was good to read about. Link to comment Share on other sites More sharing options...
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