have a 1970 Johnson 60hp, model # 60esl70b.. took it to the creek yesterday and the motor is stuck in foward gear and when i started to give it gas nothing, once i got the throttle lever all the way foward it slightly picked up speed but wouldnt open all the way up. also it will not go into neutral and when i tried to pull the lever back to reverse it gave it the same little amount of throttle, but still going foward. so it will not shift out of foward and will not give it any gas unless you push the lever all the way foward. any idea what my problem is?? i believe its in the shifter/throttle lever but dont wana go ripping it apart without some idea of what im looking for. thanx for any info you have