I have a 91 OMC cobra, 5.0 liter and ever so often when I go from nutral to foreward, the boat will go foreward for a few seconds then "clunk" and keeps going. It is like the foreward gear was not fully engaged or something at the time. It doesn't always happen, but will usually do it while I am a relatively low rpm and will always do the clunk after coming from nutral and takes a few seconds of travel before doing the "clunk" Is this a shift linkage adjustment issue or worse? If it is a linkage adjustment, can you talk me through it, or is this a tricky thing left to pro's? 
What is all this talk of the lower units not being that great of a design, is there items to keep a close eye on, or save up for even with regular mantainance?
What is all this talk of the lower units not being that great of a design, is there items to keep a close eye on, or save up for even with regular mantainance?
