I have a 1972 25hp Johnson, tiller steering, motor will not go forward. The lever moves but I don't feel it engage in gear. It shifts into reverse just fine. I did notice the shear pin was broken but pior to noticing this it still went into reverse. I don't think the pin could have broke in such a way that allowed it to go backwards and not forward. Where do I look to solve my problem and what do I look for. <br /><br />Thanks