MINSK Repair Manual page 17

Otherwise, first make sure there is no problem with the sparkplug wire. Ensure
that both ends of the sparkplug wire coming from the transformer to the sparkplug
cap are screwed in nice and tight. Then ensure that this thick wire is not old and
weak. Often the fine copper wires in it break up at the end near the sparkplug cap.
To rectify the problem, cut five millimetres off the end of the large wire and once
again earth the large wire to the engine and kick-start the bike to see if there is any
spark. If no spark, then carry on to the transformer, which is the large plastic tube
shaped object screwed to the frame under the petrol tank. At the rear of the
transformer on the left is where the large wire going to the sparkplug is screwed
in. Also at the rear of the transformer but on the right hand side is a smaller wire.
This is the wire which brings the charge from the 'K' terminal on the electric box
to the transformer. Pull it out from the transformer, touch it to the engine casing
and kick-start the bike. There should be a very large explosive spark. If there is a
spark here but not with the large sparkplug wire then you know the transformer is
broken or the connection clip is dirty. Check and clean all the connection points
on it first and try again. The transformer can not be repaired and must be replaced.
If there is no large sparking from the 'K' wire to the engine mount then the
problem lies further upstream with the electric box, generator or wires connecting
them. Move to the electrical box and first check that the wire clipped to the 'K'
connection point at the rear of the electric box is secure. Then move to the wire
connected to '3' connection point at the front of the box. This wire originates from
the generator. Pull out the '3' wire, touch it to the top of the electric box (scrape
the surface of the box first to improve the conductivity) and kick-start the engine.
If there is a spark then you know that the generator is fine but the electric box or
the 'K' wire is broken. To check the 'K'
wire, connect the '3' wire to the 'K'
wire, kick-start the bike, and check for a
spark back at the engine mount under
the transformer like you did before. If
now you have a spark then the electric
box is broken. Confirm this by using an
electric box from another bike. Clean all
the clips on the faulty electric box with
©Digby Greenhalgh 2000
Minsk Repair Manual
sparkplug
cap
sparkplug wire
(screwed into the
sparkplug cap)
14
goes to
transformer