Will johnson 175 work on 18' Wellcraft?

[k9hunter]

Well it almost that time of th eyear again and I am looking to upgrade from my '94 Evinrude 120 hp w/ 20" shaft. I have an oppurtunity to purchase a '98 Johnson 175 w/25" shaft (model#: J175FSXECS) for a really good price. My 'rude has been working great after several new electronic components replaced, but it has always had a problem with cavitating while on plane. Based on calculations, shaft is too short/prop not low enough in water. My concern is the Johnson is about 55lbs heavier and torque/thrust is greater than the 120. I have an 18' wellcraft CC w/ 2' extended transom. I am having trouble finding spacs on the boat as it is an '85. What I do find doesnt really match up as i know the beam on my boat is 8' and all i can find is for 7'. This thing is a beast of an 18 footer. Should I be concerned with these increases in weight and torque? Any advice is greatly appreciated.

 

[dmas]

Re: Will johnson 175 work on 18' Wellcraft?

I don't think you would have any problem at all, I have a '89 sport 18' CC and I had the original 125HP Force on it, two years ago I got a great deal on a 2003 Jhonson 115HP four stroke, I had to add a jack plate since our transom is 20" and that motor was a 25", everything worked out great, boat sits a bit lower on the back because this 4 stroke is almost a 100 heavie but the boat runs great, if your transmo is in good shape there's nothing to worry about.

 

[LilRedNeckGirl]

Re: Will johnson 175 work on 18' Wellcraft?

Compare the engine weights. Inside 100 dont even blink.
The cavatation is the real issue. Either get more lower unit in the water by lowering the mount, or get a longer shaft.