DAS Forum für Yamaha XT600 und XT600Z

Sorry for writing in English, my german is very bad. I can read answers in German without problem.

My XT does not start, starter runs, engine goes, no spark on the plug. The resistance values on the ignition coil are correct, except the first one (Primary Coil resistance) that should be 3.4 ~ 4.6 Ohm at 20C, I have 2,9 Ohm.

Secondary Coil resistance is within range, 10.4 ~ 15.6 Ohm at 20C, and also plug cap resistance is ok.

I tried to test the coil as follows:
Put the coil and spark plug (attached) on a wooden table, jumper from the plug's ground electrode to the coil's negative wire, then with a battery power up the coil's two wires. Tap one of the connections on and off. Each time, there should be a spark.
No result-no spark.

As a new coil from yamaha cost about 80 euro, someone has any hint? Can this small difference in Ohm prove the not working coil? Someone know where to get replacement coils at prices less crazy than this?

thanks to all for reading and any help.


XT600E 3TB 1990 in rebirth phase...

Hi,

just a hint: copy and paste your inquiry additionally into our international section.

good luck

Gruß,

XT999

XT 600 E, 3TB / 3UW, Bj. 1993 http://www.xt600.de/xt_bilder/index.php?cat=10175

Hi banzai, your prob is well known, if you are in luck only the coil is kaput (few windings short).
The prob of all these Yam's is the ugly rect. reg. which I call rectal fuck'u'later, because it blows up and kills battery, TCI and coil, when you had smell of acid before.
To test the box connect a lamp 12V max. 21W instead of coil and run starter. It shall flash and between or 2 seconds after ignition on has to go out completely, no glowing at all.
When box is blown up too, I can you offer an economic repair and a coil as new half of price. Send me an email for details, best regards, Gerd