Damit bleibt als Ursache im Wesentlichen ein defekter Sensor des vorderen Zylinders.

Hello  Tritonkev,
do you have checked the Pick-Up Coils it self?

values see here: https://www.tr1.de/pages/technics_manual.php?key=XV750se&lng=eng&flg=0&pge=6028

The Pick-up Plug you can find on the left side, beside the Airfilter Housing. It is a Plug with four contacts.


Igniteck: 4 Contact Plug:
R (red) and Br (Brown) are Ground
BL (Blue) is Pick-Up 1
GN (Green) is Pick-Up 2

TR1 Wire Diagram:
https://www.tr1.de/pages/technics_manual.php?key=XV750se&lng=eng&flg=0&pge=7073  ; here Position 25

Regards
Anja

Hi Tritonkev, hi all,

I experienced a similar issue with my bike shortly ago: Sometimes (but not not regularly) one of the cylinders had no spark and began to spit and bang. I checked, exchanged and/or renewed the following components:

• spark plugs, spark plug connectors, spark plug cables
  
• spark coils (including their wiring and connectors for the primary coils)
  
• ignition unit (TCI), I tried both: an ignitech as well as an intact original one
  
• pick-up coil unit (I installed a NOS part)
  
• battery (incl. connection elements and ground wiring)
  
• all the wiring and connectors that are related to the ignition, ignition lock and pick-up circuits
  
• carburetors.
  

All that didn't help. Finally I exchanged the voltage regulator/rectifier. Seems that this was the culprit - as I could ride more than 550 km since then without the ignition issue.

My assumption for the root cause of the failure: The voltage regulator delivered false voltage values for some moments. As a consequence, the TCI became bamboozled and delivered no regular spark impulses any more.

Cheers,

Roland

Simply disconnecting the regulator won't solve the problem. You need to ensure that the voltage required by the ignition system isn't too high or too low. Furthermore, operating the alternator without a regulator and battery could damage the stator winding. It's best to first measure the charging voltage with the engine running. It should be around 14.5 volts.