If the above advice doesn't work, there is a chance it could be a hydrostatic release valve issue. There are 2 valves, one for forward, other for reverse. The 149 originally came with manual release valves, that are actuated by the lever on the tunnel cover. Often the plunger on the top of these valves corrode up and stick.
For myself, I go out of my way to never "release" older valves, in fear they won't close completely.
If you verify all else is good as others suggested, you could swap these valves (preferably without disturbing the release plunger) and see if the problem becomes slow in forward, fast in reverse. If that's the case, then you know it's a valve issue.
BTW, be sure to thoroughly clean this area before removing the valves as any dirt which enters the unit in this area will do major damage!
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