Rotax 373 engine help !

[cerdo1 10]

I have a Rotax 373, approx 1970, 2 stroke twin. It has a Bosch CD ignition with lighting coil, this being the problem ! no spark, can anyone help, advise, fix! It is a strange ignition system. please help:)

[Obelix 11]

First hit on google for Rotax 373 brings up the handbook - have you looked in there?

[cerdo1 10]

I have, its all there but i cant get my head around it, getting volts to the ht leads no spark, tested the coils got a spark, bit snookered.

[Obelix 11]

If it's a CD then you need to check that the capacitor is still good and that the trigger is working. It's probably a thyristor trigger. They are not quite the same as a "normal" coil ignition as they run a lot faster.

[geared 302]

You have voltage out the end of the HT leads?

Do they arc when you put the lead against the block?

[cerdo1 10]

Ive got the condenser out , its no good, stuggling getting a replacement, i have serial numbers etc. Cant find one anywhere

[geared 302]

Have you tried Gunson in Hillsborough, they can get lots of hard to find parts.

 

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