2nd stator died within 10 miles!

[olliewtf]

hi all,
I was running an old vespa conversion flywheel and stator with a new barlow built crank for 250 miles. Last week stator packed in. was out driving and it cut out with no spark.
Eventually sussed it was the stator so waited for a new SR rewired indian stator to arrive. It did so yesterday.
Upon fitting it I noticed the old stator sheared 2 rivets which had scored the flywheel and nibbled at the pickup. figured this was the reason for no spark.
fitted new stator, drove home, collected the missus and set out. scoot ran well, better than before, i have a feeling the old stator was messing up my timing, potentially fluttering, possibly due to the coils being so loose on the back plate.
only did 8 miles, and suddenly the scoot did not want to rev out, started to misfire, so i pulled over.
scoot wouldnt rev out in neutral. It then died, and wouldnt re-start due to no spark.
had to get recovered.
Im not convinced its a twisted crank making the flywheel rub.
Someone mentioned pickup height.
Imgoing to pull flywheel later and have a look.
Im hoping ive just been sent a duff stator and i can shout at someone at SR.

Really starting to test my patience, plus i dint have the money to keep buying parts!

all help appreciated.

[eden]

I would be looking at twisted crank and or f@@ked mag side bearing 1st

My.money is on twisted crank though.

[olliewtf]

cheers eden, although really not the answer i was looking for aha! gonna test stator now and take flywheel off and see. fingers crossed.
had another look at previous stator, as said pickup was a bit nibbled, but i think that was down to the loose rivets. theres wear on the coils, and im hoping thats just because the stators coils came loose.
either way, going to investigate now!

[eden]

hurry up then

[Monty]

I'm in the same boat with a virtually brand new BGM either starting first kick but then just dieing or will not rev out. When it's dead no spark but it meters out perfect. Replaced the CDI same so I'm back to staters again...
What's the best way to check the crank. Can I use a dial gauge on the end of the crank once the flywheel is off. What sort of run out is acceptable. Can it be done in situ

[olliewtf]

okay. took off flywheel. the pickup fell out in many small pieces. none of it was left. other parts of the coils are damaged, namely the outside black plastic at the top has been shaved off, at least those closest to the pickup. this couldve been caused by the pieces of pickup.
Ive measured the height of the coils with the last stator, and the last stator is actually taller, only by about 1mm. pick up is obviously much taller, but cant compare to the sr one. I didnt even think of a compatibility issue... But i think its settled that im too blame for not checking this out. How i dont know, as my vespa flywheel has no holes to check clearances... And im really pissed off as ive destroyed a decent stator within an hour and dont have the money for a new one, let alone money to sort out why it happened in the first place!
ps im still not convinced cranks twisted, because that would really add to my misery.

So.

is it worth me just changing the fookin flywheel?

Is my current stator repairable?

will try and post up pics, but jsut imagine a brand new stator without a pick up fitted. add a bit of debris. done.

a very unhappy scooterist signing off.

[rosscla]

The clearance on the pickup,is marginal at best, AF Ducati and AFR flywheels are notorious for rubbing pickups.

My Ducati AF fly wheel was 0.2 mm less deep than an AFR one I have. The Ducati rubbed on the pickup and the AFR didn't. This was after a change of crank. I just had the inside machined by 0.5mm to clear it.

If you replace the pickup the rest should probably be OK.

[olliewtf]

cheers mate, thats helpful. i assumed that problem was only with the af lightened flywheels, didnt even think id have a problem.
annoyingly there is no way of checking what the clearance is as there are no viewing holes in the flywheel. not sure what course of action to take now, either machine the stator down further, although i can see that has already been done, probably by sr. Im tempted to call them and see what they say, I mean it is my fault but i might have to blag it a bit, see if i can get some advice or help from them. maybe theyll send me a pickup.
Im also tempted to sack in the flywheel and get an indian one as this seems to much bluddy hassle.

Does anyone fancy swapping a leccy stator and flywheel for either a fresco or some soul records? aha

[rosscla]

Some used to take up to 1 mm out of the mag flange to drop the stator a little and improve clearance. BGm now seem to have dropped a couple of laminates off their latest stators too, below the pickup so I wouldn't feel to bad about it.

[Muppet]

or fit a thicker mag gasket