Thread subject: Whaler Central - Boston Whaler Boat Information and Photos :: Repowering my 1967 custom Nauset

Posted by Phil T on 02/13/18 - 5:02 AM
#2

J-

The boat has a very heavy motor to begin with. I recall the older Honda 90's were near or at 400 lbs. That is alot.

Add the weight of the jackplate.

The engine reads to be mounted far too low.

When running (now) it reads as if you trim your engine out before the boat actually transitions onto a plane. This will make the bow rise even more before planing.

The advice for operating is to trim the engine in all the way in and then advance the throttle so that the boat accelerates quickly to reach displacement speeds. If you slowly accelerate it makes transition harder and longer. Once on plane, throttle to desired speed. Once there, adjust trim out till RPMs stop increasing.

With the new motor (~25-40 lbs less) and removing the jackplate (15-20 lbs less) AND the engine raised so the bolts are at least 2 holes up, the boat will handle MUCH differently.

See Reference Article on bolt mounting. http://www.whalercentral.com/articles...cle_id=106

Jackplates are good for very shallow running or making up for a wrong sized motor (25" instead of a 20" shaft.) It does not read as though you have a compelling reason to add the expense, weight or complexity.

Don't accept some cheap aluminum prop. Mount a good stainless steel prop.

Edited by Phil T on 02/13/18 - 5:04 AM