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i`ve got a better bt125-6 and the cdi has gone.i`ve bought various replacements but none work exept a secondhand one from a breakers but this just lets the bike start and idle and as soon as i get to about 3-4000rpm i dies.i have tried the place i got it from but the one they sent me did`nt work either.they said they are all the same but i`ve been told there not.the engine number is bt156fmi.any help would be very much appreciated.atached is a picture of cdi with part number
Mark,
Welcome to MCM. I've had a similar problem that turned out to be a dirty carburator. Are you 100% certant it's the CDI? Also, where you writing from?
CC
i`m writing from england.i cleaned the carb out and also used compressor.
i get a good spark from the second hand cdi but no spark from the new ones
and the plugs are the same on them all.
Found a CG125 "Race" style CDI that claims to have automatic timing advance on Ebay. Not sure how this one differs from what you've tried already but it's worth checking out.
http://cgi.ebay.com/ebaymotors/race-...Q5fAccessories
Did you get all your others from Ebay?
CC
thanks i will try them.bought 1 of them of ebay.don`t understand why they are all different i`m ok with the mecanical side of things but just can`t get my head round this electrical problem.
also if i can`t find a new cdi,would i be able to change anything on the engine to make a different one work
Chasing down electrical problems is the worst. All the CG based engines should be similar, and they are very common so I'm not sure what to suggest. Have you checked the alternator output? Also, is it possible to check your current CDI on a different working motorcycle?
CC
Hi Mark,
Is the one in the picture the one that you had on it originally? It looks to me like that CDI says CG125 on it. That is a very common CDI and if the new one you have has that or FDX125 on it then you should have the right one and probably you have a different issue. By the way the FDX model usually looks exactly the same but it has the rev limiter removed.
I did have some issues with one a few years ago that had the same plug as that one but definitely was not the same CDI. Hopefully that is not your case. If you are still having trouble I can check with my CDI manufacturer when they are back to work next week, let me know.
Hope that helps.
Cheers,
Art