1980 20 sf power?

[cjm1300]

I have a1980 sf i am repowering i have a 225 efi now i am looking to put on a four stroke is a yamaha 200 to heavy? And would a150 be enough motor?

[ScottM]

20' or 23'?

[eggsuckindog]

it says 20 and yes it is to heavy - a 150 will work great a 225 is way more than needed

[ScottM]

Oops, missed that in the title.

[CHANCE1234]

Way heavy, a lot of 23 run with 225s. Not necessary on 20 as efficient as a Seacraft.

[TunaMeltdown]

I had a 135 opti-max on my 20' but there were times I wished it had the 150.

[eggsuckindog]

OK Scott, a 23 could barely handled it anyway

[PigSticker]

I saw an 87 20ft with a four stroke 150 on the transom and it had water coming in the drains with no one in the boat

[cjm1300]

Hey guys thanks for the info. Like i said i have a 225 2 stroke now. I love the speed but the boat is being restored right now and i am looking for good fuel economy but still speed. Again thanks

[Bushwacker]

Originally Posted by cjm1300

. . . and i am looking for good fuel economy but still speed. Again thanks

Then look at an Optimax or E-Tec that will have similar fuel consumption to a 4 stroke (> 4 mpg) but are much stronger on mid-range torque and power/wt. The Zuke 140 at 421 lbs (before you put 11 pounds of oil in it) is relatively light for a 4-stroke and the only one I'd even consider and would probably get you about 40 mph. However the small block 2.7L V-6 E-Tec at 433 lbs is a much stronger motor. The 150 is actually 165 at the prop with tons of mid-range torque and should give you mid to upper 40's. The 175 & 200 may have a little less mid-range torque, but should have enough top end power to put you over 50 mph.