new magneto stators coming in at 450 ohms?

Discussion in 'Spare Parts, Tools & Product Developement' started by crassius, Jul 24, 2012.

  1. crassius

    crassius Well-Known Member

    Hi all, just got some new stators for the common 2-stroke engines, and they measure at 450 +/- 20 ohms. I wasn't involved with these things back in the 250 ohm stators, which I understand made the engines harder to start, so were replaced by the 350 ohm stators.


    Has anyone else seen/used these?

    Will the extra output change the trigger point in the timing of the CDI? (maybe advancing it)

    With CDI units seeming a bit on the fragile side, will this cause more dead CDIs?

    any info someone may have will be appreciated, thanx

  2. sp454e

    sp454e Member

    need more info, pics and cost
  3. Fabian

    Fabian Well-Known Member

    This is going to be an interesting thread :likelots:
  4. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Where did you buy them from?

  5. crassius

    crassius Well-Known Member

    don't have a pic handy, but except for being a shade fatter they look just as they always do

    just happed to measure one when replacing a dead one on a bike & was surprised at the diff - grabbed another new one out of the crate & it read the same

    looks the same, costs the same as usual

    had trouble mounting it tho as the 2 rivets on the lower side of the lamination were not finished flush enough to keep it from standing a bit proud in relation to the rotor face

    makes a nice spark, but we're worried about frying the CDI
  6. MotorBicycleRacing

    MotorBicycleRacing Well-Known Member

    Where did you buy them from?
  7. crassius

    crassius Well-Known Member

    dunno where as I'm just the mechanic, but it was same place we always get them

    sorry for short answer, but I don't sell them or deal with the business stuff, and at my age I might not remember where I got them if I did buy them myself : (

    all I know is that with different length barrels and two sizes of woodruff keys on both cranks & output shafts, it's getting real hard to fit parts into these things
  8. crassius

    crassius Well-Known Member

    OK, just got word that these came from BGF and they were returned & replaced by the usual 350 ohm stators, so we're not going to have to deal with those 450s. Anyone ordering from BGF might want to specify the 350 ohm stators if they don't want to try out the new ones.

    If someone does try these tho, I'd like to hear how well they work.
  9. Fabian

    Fabian Well-Known Member

    I'd like to hear how they work too, and the effect it has on the timing curve?
  10. BigBlue

    BigBlue Active Member

  11. crassius

    crassius Well-Known Member

    yes that's it
  12. sp454e

    sp454e Member


    I like the mag and myster. BUT???? I have ask this Q. many times no one knows what the gap is btween the magnet and the magneto loop
  13. crassius

    crassius Well-Known Member

    I've seen sizes vary somewhat, which will make for different sized gaps, but it should be equal on top & bottom - also if it is very small, check that the armature legs of the stator haven't been 'pinched in' by dropping or being crushed a bit in shipping/handling - I like to see at least 8 thou here.
  14. sp454e

    sp454e Member

    mag air gap

    is that manufacture specs. here is a $5.00 trick I used a business card doubled up
  15. crassius

    crassius Well-Known Member

    8 thou is not an official spec - I just don't like to see something spinning that fast while that much vibration is going on without at least that much clearance