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ideas for a new sem safe stator

K

kris650berg

Joined Dec 2011
69 Posts | 2+
north west, england
hi all
just thought i would post and see what people thought
iv been toying with the idea of desighning a new sem safe stator well over the last few days iv put my thoughts down on paper and came up with a stator thats sem safe and a direct bolt on replacement
iv came up with a desighn were as if 1day its fails u will b able to test with ur meter and replace the failed component only with an easy to change brand new 1 at a fraction of the cost of a complete unit or a rewind
like i said its only on paper at the min but this is a work in progress i know a guy with the right machines who can make my components so its very possible 4 me to have a few complete units up for grabs next year to get peoples feed back and views on it


cheers kris
 
Hi Kris

Could you explain a litlle better ? Its a compleetly new stator ??

I don't know how you are going to do that miracle, but count with me !!

:cheers:
ZAGA
 
hi zaga
its not as complex as it seems im not willing to go into detail about how iv made it sem safe but i have cracked it.
have u ever seen a pitbike stator, how simple they are and how easy components can be replaced well this is kind of wot iv based my idea around
i own many sem stators i also rewind them so i know my way around 1 but iv never seen an electrex in person i have been researching electrex over and over and comparing them with sem and i have now cam up with the sem safe direct replacement
at the min all my research and planning has gone into the sparking side but this is the part thats not sem safe with other non sem products so up to now iv desighned a motox stator
i am going to start making my prototype this week so when iv got that up and running im gunna extend my plans and desighn and make up lighting coils then when iv got a complete unit im gunna get the components properly fabricated as i dont think my prototype will look very pretty lol
as i said when iv got a couple of units made theres gunna be a few up for grabs maybe u and jampe could have 1 each and share ur views to the rest of the berg comunity


cheers kris
 
Hi Kris

I have 2 pit bikes but never payed much attention to them, wich is a good sign, zero problems !

This is a subject that is been knocking on my head for a long time but I don't have the electronic knowlege to go on.

I've found one solution made by one greek member OYK, it was to use the 12V circuit (Yellows, that never brake) and then use one transformer to put the voltage up, it was a big and heavy solution, tried to explore it anyway but OYK never explained to me very well the transformer features. Following that type of solution I could try one very weak CCFL invert or a DC-DC converter, but once again I did not had the knowlege to go on.

Also with the Electrex stator I've read that it would burn the CDI with peaks of power, also had reports from some members that never had any problems with them, but allways had reports of better starting with them (maybe the extra coil ??). Made some research and I think its easy to limit the power peaks with one inverted zener bettewen the red and black, but never found (because of my knowlege) for shure the right diode that it would limit the power to the 300V (and don't know the amps), spoke with one guy from HPI, that is electrex, and he told me to use one 3 Watt diode ?????. Also had reports that they aren't very reliable, but not sure.

Anyway go for it, there are a lot of bikes out there, and don't forget it would be good to have also one MK1 startor, it goes from 89-98 on Bergs and there's also VOR, KTM and Husky with the MK1 stator.

If I can help in some way let me know.

Keep us posted, very interesting :!:

:cheers:
ZAGA
 
Subscribed to this one! I put a new flywheel in mine last season, and my SEM has been rewound... working very good right now, but you never know.

If you need another tester... let me know... I have a background in electronics so I certainly understand the details of how they work.
 
So kris
How are going with your project ? I'm very curious to see the result.

:cheers:
ZAGA
 
hi guys

i went up to see my friend just before chrismas who can make my components but he had a lot on with the chrismas and new year closing but he re opens tomrorrow so i can continue with my plans then.
in a way im glad he was closed as iv been over and over my plans and changed a few things made a few improvements and its give me time to work on other things.
iv been designing other stuff aswell im not going to spoil the surprise but i have got sumthing else in the pipeline
thats not as complex as a stator and its not just for husabergs.
its really hard to come up with sumthing new without stepping on peoples toes or offending them but i think i have done it lol
also my 650 is nearly rebuilt so my stator repairs for 99-03 should continue sumtime this month i will then after that i will b rebuilding my 94 600 and will b able to repair the mk1 stators in febuary sumtime hopefully

cheers kris
 
Hi Kris

To have a cheap replacement for SEM its a dream, and if it lasts it can almost makes me cry :wink:

But we allways whant more, you know about the problems of the SEM to get minimum voltage to fire the bike, with the kick and specialy with the starter. There is one solution with one CCFL to boost the start, but if your solution can improve this also, it would be great.

Keep working you lazy :mrgreen:

:cheers:
ZAGA
 
Hi!
I have tried it......and no sparks.......
I think that problem was the Voltage was very high (600-800V? I don't remember ) but the current was to weak.....

Or maybe I had a wrong CCFL ......

Regards Damian
 
Hi

Do you have the drawing from TINWELP ?
For me the problem with most CCFL is that they have too much voltage, and I'm afraid to burn the cdi, the moust comon have 800 to 1200 V, wich is a lot more that the 300V, and you will be adding voltage to the voltage that the stator is allready producing.
If you suply 100V more is more than enough to make it start, but you got to have minimum voltage on the green (triger) to fire the spark, so that can be the problem, and on the green I don't think you can do nothing about it.

:cheers:
ZAGA
 
hahahaha lazy u make me laugh
i think im guna stick to my plan and see were that takes me
i dont run electric start on my bike shes set up for mx so i use my foot and with my own rewound sem i never encounter any starting issues (first kick hot or cold)
so i dont see any reason why my stator will have these problems but we will see.
i do honestly think everybody tries to fix this already complex problem with more complex solutions which only confuses the matter further the problem needs braking down and simplifying which is exactly what iv done.
its all good having a unit that looks nice and fancy they only make them look so fancy because there so unreliable and u spend half your life looking at them iv seen the most basic stators last for years and years they dont look like much but they dont need to because u never pay any attention to them the only time u see them is when its rebuild time.

cheers kris
 
Hi Kris

You are right, I've tried to go to strange solutions with the help of one not active member, TINWELP, he knows about mechanics and electronics a lot more than most of us, and he allways told me the best solution was to have a decent stator. Unfortunaly he isn't very active because he did not liked some of the things that were hapening here at UHE.
About what I've told you before its true, I have a re-rewound stator by sparks and some improvements on the engine, and my bike starts very well, but for some that is a problem, to get minimum voltage you have to get max rpm with the kick, and in some cases not so easy.
:cheers:
ZAGA
 
Hello Kris.
Can i send you a broken stator for rewinding now?
Tried to send a message to you but the messages stays in my outbox, so i try to contact you this way.
Regards
Jampe
 
hi jampe
i have sent u pm sorry for slow reply i have been buisy building my replacement stator
so far i have built the charge coil and the plate that holds it all together im just working out the pick up coil now so should have sum results as to how my design works over the next couple of weeks

cheers kris
 

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