HELLO FRIEND, TALK TO THE OLD SCHOOL, DEAD UPPER POINT OF CAMS, SUPERIOR DEAD POINT OF PISTON, WELL BALANCED EVERYTHING, THEN CONTACT YOU TO ENABLE THE FUEL AND TURN IN THE SENSE OF ROTATION OF THE ENGINE TO IDENTIFY WHEN IDENTIFYING OF THE INJECTOR OR THE PUMP, WHEN INJECTED, BRANDS WITH SOMETHING, A MARKER, CORRECTOR THE EXACT PLACE IN WHICH I DID IT BUT THE POINT IS NOT AND YOU PUT A RETURN ALMOST COMPLETE TO THE PULLEY WHEN YOU FEEL THAT IT GETS HEAVY TO INJECT ONE, RETRO A TOOTH AND THAT IS THE EXACT POINT OF THE PUMP. ONE SEE EVERYTHING MARKED YOU COME TO PLACE THE BELT. LUCK . REGARDS .