blowing coils

[mickdale]

is there any reason a scooter keeps blowing coils?

have a new build not runnung right (missing over 1/2 throttle after 5 - 10 minutes of riding)
coil was changed and was ok but after 10 minutes of riding there seemed to be a pop and engine stuttering and missing again

could it be a problem with a brand new sil stator plate?

cheers
mick

[soullad]

It could well be. Can you try your new stator in a mates running scoot. If it doesn't play up then you've eliminated that item and can check your wiring to see if its earthing out anywhere or if your CDI / HT lead / plug is faulty.
If your mates now runs crap then its got to be stator related. If this is the case I would check these in this order - solder joints, esp a possible loose earth tag, dodgy pick up (swap with BGM unit) or the LT coil is breaking down under heat (replace with new item)
Hope that helps
Ian

[tha83]

I've found that SIL stators are very good if all parts are replaced with ones of decent quality.

Seriously though, replace the trigger/sensor and rewire and solder the SIL unit to be sure it is working correctly. Seems like a bit of work but you'll have a unit you can trust.

[mickdale]

ive got a serviced sil one that beedspeed did 4 me which i will try
the other option is to buy a 120watt bgm one

ran it again today - ran fine pottering around town for 10 minutes then when i tried to open it up a touch it intermittantly cuts out when i try and go over 1/2 throttle revs with an open throttle

feels like the jetex/fuel starvation but suppose a dodgy stator could do the same?

cheers
mick
ps i changed the ngk plug for another one - will also try and get a champion one n3 type?

[mawso]

This sounds like the exact same problem I'm having. Did all the usual simple checks like plug, HT lead & cap, loose connections, green wire CDI, carb banjo filter, etc, etc but it was still the missing and not clearing out. It also seemed ok after being left parked up for a while and restarted, but after 5 mins riding it was back again and got worse when given anything above 1/4 throttle. I've been informed it's the electronic pick up on the stator plate which is on it's way out. Hope it is as it's a relatively easy job to replace once flywheel is removed. Hope yours proves to be something simple too.

[mickdale]

thanks for the info mawso

the help i get from this forum is invaluable

will order a bgm pick up and try that

cheers
mick

good old indian quality - the original one must have lasted at least 30 miles before giving up the ghost

[mickdale]

triedthe spare stator and ive still got the problem

could it be the rectifier?

starting to think it could be the jetex now........