CDI components - transistor?

[Anonymous]

Hi All,

Well, the day of reckoning after 6 months of rebuild saw my GS1000G firing on only 2 cylinders

Because of the cylinders we tracked it down to no life from one of the coils. Swapped the coils around - same problem. The local electrical genius had a look at the CDI unit for me and identified a faulty transistor.

Now the transistor can easily be desoldered & replaced at a cost of about 40 pence...if I can find one The model is 2sd977. Having searched a few online old japanese transistor suppliers I am still unable to find a suitable replacement and cant bear the thought of replacing the entire unit for the sake of a 40pence component.

Anyone have any ideas, or am I just going to have to bite the bullet and shell out the ?80 or so for a replacement CDI - if I can find a suitable one of those?

Desperation is setting in as the summer is almost over and I'd like at least a little nice weather to play in before the waterproofs come out

Any help/advice appreciated.

horlix.

[Anonymous]

Replace the CDI, forget the transistor. Component level repair on a CDI is not worth the effort. You already said, you are tired of watching riding season fade away. Get off a buck, and buy the part!

[Anonymous]

i have had unending cdi problems, getting mine repaired, only for another component to fail, buying second hand (unsuccessfully), etc. if i could go back, i would, and bite the bullet and save all the hassles. Its not want you want to hear, but i would follow mr Barnby's advice......

[Anonymous]

hey horlix,

I too am at the end of a long restoration project and faced CDI problems. I opted for saving myself $400 Canadian and removed the pickup coils and CDI, and installed an old fashioned set of points. A dyna S ignition would also work well. The points work fine - lots of fire. Also, you should make sure that one side of the pickup coils isn't shot.

hating Capacitive Discharge Ignitions,
Craig

[Anonymous]

Thanks all,

well I'll have a hunt around for a reasonable cdi unit, then go for points if I cant find one

hopefully should have the bike back on the road next week sometime.

Cant wait!

horlix

[Anonymous]

The CDI on my GS250 went belly up, due to reg/rec open circuit and Crooks in Cumbria and Spares Direct wanted ?317.00. Replaced it with complete set up from Boyer Bransden for ?130.00 complete with coil.
MartyC

[Anonymous]

Re: CDI components - transistor?

Hi All,

Well, the day of reckoning after 6 months of rebuild saw my GS1000G firing on only 2 cylinders

Because of the cylinders we tracked it down to no life from one of the coils. Swapped the coils around - same problem. The local electrical genius had a look at the CDI unit for me and identified a faulty transistor.

Now the transistor can easily be desoldered & replaced at a cost of about 40 pence...if I can find one The model is 2sd977. Having searched a few online old japanese transistor suppliers I am still unable to find a suitable replacement and cant bear the thought of replacing the entire unit for the sake of a 40pence component.

Anyone have any ideas, or am I just going to have to bite the bullet and shell out the ?80 or so for a replacement CDI - if I can find a suitable one of those?

Desperation is setting in as the summer is almost over and I'd like at least a little nice weather to play in before the waterproofs come out

Any help/advice appreciated.

horlix.

Its been at least 30 years since i fooled with anything electronic but i remember some sort of a substitution book for parts have you looked into that--

Ill send a note to my relatives in ny they are quite good with these things and ill ask for a substityte

[Anonymous]

here is a shareware site for free downloading of a substitution program

http://www.simtel.net/pub/pd/46498.html

[SqDancerLynn1]

alot of time the number may be specific to the mfg, they don't want you to repair it they want you to replace it for reliability reasons