Xs750 mistic problem

[Gacas]

Hello, I'm new here. Some time ago I got XS750 and I realy like it, but it has one problem and I don't know how to solve it..
The problem is that it wont start often than start.
When engine starts, than it works good (no misfire, engine runs good, without any problem), but often it just wouldn't start because of no spark in any spark plug. Tryed to change ignition unit (used/checked/working), but result is the same...
Maybe somebody can help my with some ideas?
Thank you in advance

[DEEBS11]

Due to the broad description these are the possible areas: Loose fuse, burnt or loose connector, loose battery terminals, faulty key switch, bad contacts in right hand kill switch.

Also, spark plugs, spark plug wires, coils, & old battery that fools you by showing 12+ volts after a charge but has reduced amperage because of sulfation (long periods of neglect/winter lay-up).

In the case of the weak battery the engine turns over but does not have enough amperage to also light the ignition. This is a very common problem.

[Gacas]

Thanks for answer.
Some of posibble areas can be dismissed(I think):
* If loose fuse - engine wouldn't start at all (now sometimes it starts) and all fuses are checked and changed
*Battery, spark plugs, spark plug wires are new.
If there would be problem in coils than maybe when engine starts it wouldn't work good. Isn't it?
*Bad Kill swich contacts will stop engine in "not conecting" moment, but if engine start it wouldn't stop till I stop it. I can ride for an ours without problem.

Correct me if I wrong in any of these points.
Allso I ordered other pulse sensor, so I will check if it will solve my problem.

[DiverRay]

If you still have the original round glass fuses, that is probably the problem!
Replace the fuse box with the newer blade style fuse block.
The kill switch may cause a no start, but bad connections are usually the problem. Clean EVERY ground connection on the bike.
Look at all the connections and verify that there is NO oxidation on them. If you find one that does show signs of oxidation, clean with very fine sand paper or crocus cloth, and squeeze the tabs on the female connectors just a little.

[LAB3]

Sounds like a bad connection at the pickup coils, mine does the same thing when the wires need attention. It's a well documented problem with the XS, a search on pickup coil problems should tell you all you need to know.

[Socer4m]

when you mean not starting,,,does it flood the engine? If so, check the plugs to see if wet,,,if they are not wet, then its a carb problem,,,maybe turn the petcock to prime and try to start,,,if it does then there is a problem with the petcock or fuel filter could be plugged,,,also check the vacuum line to the petcock from the engine to see if they are tight on both ends and not cracked or loose which causes a vacuum problem to the petcocks.....all this is simple to check and keep us informed, its usually something simple, and not throw money at parts...........Mike in S.Diego and Pa

[Gacas]

when you mean not starting,,,does it flood the engine? If so, check the plugs to see if wet,,,if they are not wet, then its a carb problem,,,maybe turn the petcock to prime and try to start,,,if it does then there is a problem with the petcock or fuel filter could be plugged,,,also check the vacuum line to the petcock from the engine to see if they are tight on both ends and not cracked or loose which causes a vacuum problem to the petcocks.....all this is simple to check and keep us informed, its usually something simple, and not throw money at parts...........Mike in S.Diego and Pa

As I mentioned earlier, when it not starting there is no spark on all spark plugs. I allready ordered another pickup coil and will see if it will solve my problem. But till I get it (it will take about a week) I wil check some posible solutions mentioned by DEEBS11 to be sure that everything is ok there