Extending outboard shaft for taller transoms
 

The other night during insomnia I googled changing from 20” to 25” shafts. Even saw Bigshrimpin’s name in one remark and was surprised there were some 5” extension kits from Bay Mfg. for my ETEC. I was wondering what is the most recent experience with this approach as opposed to replacing the 20”
shaft. As a retired engineer who designed shafts, albeit at much faster rotational speeds, the thought of something two piece and not knowing exactly how they are joined (supported, etc.) surprised me. Any updated experience? Thx

I ran an inline 6-cylinder Mercury 140 with a 5" extension kit from Bay for several years on a Checkmate 17. I loved it. Follow the directions and you'll have no problems.

Only caution I have is to exercise a bit more care than usual when re-installing the lower unit to ensure the proper alignment of the extended water tube. I never had a problem, but could see how it could be misaligned if you weren't careful.