I bought tiller off craiglist. I get it in the water and hit the gas. It sounds like a blow out. The prop hooks up a little and the engine revs like spun hub. I talked to a buddy of mine and he says it might be the shift shaft. With motor off I shift into reverse and tried to spin the prop. It's locked which is normal, right? When I shift into forward the prop won't spin counterclockwise, but spins clockwise with a loud click. My buddy said shift shaft needed to be adjusted. I he insisted I needed to drop the lower end. But the linkage is exposed. I should have to drop it to adjust it right? There's 2 setscrews on the linkage. Can I adjust the linkage without dropping the lowerend? Is that my problem? The shift shaft? I hope I didn't get screwed. Thanks.