Has anyone recently re-powered?

My father is looking to re-power his 17 Guardian.

The boat currently has a 10 year old 70hp Yamaha 2 stroke on it. They mainly target squid and herring along with pulling cray pots so don't go too far or too fast.

IF anyone has recently done a re-power in the 70-90hp range, can you please let me know what you got and why?

Thanks in advance

little johnny's picture

Posts: 5279

Date Joined: 04/12/11

I went from 90 2 stroke yammy

Wed, 2019-07-10 08:09

To an 80 four stroke yammy few years back. Reason I went 80 hp . ( same motor as 100 hp) just different chip. My boat just over 17 feet. 4000 revs still sit on 20 to 21 knots.5000 rpm gets 26 to 27 knots. My thought was 80 would last longer due to being same specs as 100 hp so even if I opened motor up to full wouldn’t matter. If that makes sence

hezzy's picture

Posts: 1509

Date Joined: 27/11/09

i upgraded a 97 two stroke

Wed, 2019-07-10 08:28

i upgraded a 97 two stroke yammy , replaced it with a new 2016 90hp two stroke yammy

i did not go to a four stroke

my thoughts where

4 stroke was somwhat heavier and may affect the balance of the overall boat at rear transom

out of the hole speed or get up and go from standing start , pulling pots of margs i need quick acceleration often , feedback was the 2 was better overall in that regard

noise and fuel cost where not an issue for me in considering the motors

the first yammy had performed excellently , and this second motor has been the same


OFW 11

evil flourishes when good men do nothing


Posts: 308

Date Joined: 28/05/15

I replaced my 2003 Yamaha 115

Fri, 2019-07-12 18:38

I replaced my 2003 Yamaha 115 2 stroke last year with a new 115 Yamaha 4 stroke..

10kg heavier, zero noticeable difference in out of the hole speed, top speed identical, fuel bill halved, range doubled, no noise, no smoke.

4 stroke all the way!!!!

Posts: 308

Date Joined: 28/05/15

I replaced my 2003 Yamaha 115

Fri, 2019-07-12 19:27

Double post

Posts: 633

Date Joined: 19/10/11

 have a trail craft pro fish

Sat, 2019-07-13 10:45

 have a trail craft pro fish 4.65 had an old merc 50hp 2 stroke, re powered with a 60hp yamaha, best think i evea did, fuel bill is halfed. runs mint and can spend 6 hours snapper fishing in the sound and use 10 dollars worth of fuel,