225 Johnson on a 20' SeaCraft

fishez4alivin · #1 04-01-2004, 07:40 PM

Have a 1976 MA 20 originally with a 175 merc....i recently repowered with a 150 ficht, dropped down in HP because the 150 weighs more. I havent lost any top end maybe 1 knot, not sure, have to run it some more. I know my boat is rated for 175, but that was in 1976...as it is the stern squats but no more then when the merc was on it. I dont know what your's is rated to, but after seeing a few whalers snap their transoms because they overpowered, i've become wary of over doing it.BTW, i get about 40-42 knots but rarely run it that hard, since where im at, sea conditions rarely get that calm.

NOAHSARK · #2 04-02-2004, 02:20 PM

Thanks for the input buddy, I just noticed that one of the guys I think it's Roland Rodriguez has or had a 20' with a 225. I am going to try and contact him to get what his take is on it. Thanks again!!

Michael Vezzosi · #3 04-02-2004, 04:53 PM

Noah, I have a '79 MA and am almost certain it is only rated to 200 hp. Purchased with 200 Merc., repowered with '99 Carbed 175 Johnson. More than enough speed and for about $600. I can upgrade to the 200 carbs...not necessary. 70 gallons of fuel. What are you carrying?

NOAHSARK · #4 04-02-2004, 05:27 PM

70Gal tank, I agree with the fact that I can do with less HP'S it's just that this motor is in great shape and if I can keep it on there without hurting the integrity of the transom I would like to. Other than the extra weight on the transom I dont think I will be adding more stress to it because I am not one to run hard? Then again I might be wrong.

lost2a6 · #5 04-03-2004, 09:47 AM

Quote:

70Gal tank, I agree with the fact that I can do with less HP'S it's just that this motor is in great shape and if I can keep it on there without hurting the integrity of the transom I would like to. Other than the extra weight on the transom I dont think I will be adding more stress to it because I am not one to run hard? Then again I might be wrong.

If the transom is in good shape then it should be just fine. I had a 97 200 Yamaha on my 20, the transom was a little soft from water intrusion, however it held up just fine. Little movement, but didn't break. [img]/images/graemlins/shocked.gif[/img] I ended up selling the boat before I had to replace the transom.