started out hard to start-would statrt on first pull using pull start (Has new battery)turns over fine but pops& backfires once it started ran fine-now wont start at all now tried new ECM no help-TP sensor checked ok-all connections look good- dont know where to go now--CKP sensor maybe??

 

The FI light will be on if you have a sensor fault. If it isn't, clean the filter in the injector, it is in the inlet, all you can do is poke any gunge out with a tiny screwdriver and blow with compressed air. If you can find someone with the kit, get the fuel pressure checked, a blocked tank filter or tired pump can cause problems. If the FI light is on you can connect two wires together under the seat and get any fault codes to come up on the display.
Having said that I have just mended a 700 which would hardly run, the connector from the alternator to the loom had melted but the FI light wasn't on.
You must be strong to start a 750 on the pull. Suzuki don't bother fitting one now.

 

dislocated 3 fingers pull starting --NO more