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Originally Posted by Rihards
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There are a couple of links within your link that may be able to source a manual for your bike, or at least a wiring diagram.
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I seem to recall that there is much more ongoing interest in this generation of bikes in Germany than elsewhere, hence those websites.
Even so, the wiring is very simple based on the battery-less system but a direct magneto ignition is reputed to produce more high voltage circuitry compared with a system based on a battery if I recall correctly.
In other words, more of the wiring that does exist in a TTR600 is carrying high voltage which could lead to "jumping the gap" other than at the spark plug.
Certainly, it is worth checking that all the earth/grounds are clean and not corroded/dirty.
Electricity will always take the line of least resistance, so if it is going via you then there is a fault in the "as designed" bike circuit.
I did have a problem with my plug cap all those years ago: it had pulled apart internally but that couldn't be seen visually but only when the cap was taken apart; this was probably caused by me pulling the cap many times while working on the bike.
In that case, the spark did not get to the plug at all.
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Dave
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