Help please broken minsk

Dec 30, 2010
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Hi everyone
We're after some advice from anyone who has experience with minsks.
We bought a minsk from Cuongs in Hanoi a few weeks ago.
We are in Dalat now, and we only just made it was running very rough, struggling to get up hills and it sounded like it was misfiring.
On looking at it the following day it had a very weak spark to begin with and a very black sparkplug. After cleaning the spark plug then no spark at all.
Sine then we have changed the spark plug - still no spark, changed the electric box and transformer - still no spark.
There is a charge from the generator, and there is a charge from the wire coming from the generator into the electric box, but no charge from the electric box to the transformer. We have tried a new wire from the electric box to the transformer but this made no difference.
We've followed all the steps in the manual and we don't know what to try next.

We're having problems finding a mechanic because of the holidays and we're not sure the mechnics here will be able to help on the minsk anyway.

Please can you advise any next steps to take, as we are really stuck.

many thanks
Mark and Gemma