4 Stroke Weight vs. 2 Stroke on Bracket

[joe7670]

I keep reading about the concerns of putting a 4 stroke on a bracket due to weight.

I'm looking as yamaha's website and the 150 4 stroke is just 40 lbs. more that the same size 2 stroke model.

Am I missing something with respect to weight that they are not displaying on the specs sheet?

I was almost convinced that I had to go with 2 stroke just from reading posts, but if I can, i'd really like to go 4.

[Blue_Runner]

My personal opinion is the 40 extra pounds will not make much difference.

[genesis08]

Forget the Honda's

[joe7670]

Actually Honda 150 20" shows a weight of 478 with the 25" at a weight of 485.

Yamaha 2 Stroke 20" 426 a bit more for 25" but not listed.

Yamaha 4 Stroke 20" 466 a bit more for 25" but not listed.

It doesn't seem like a lot of difference.

[RidgeRunner]

The direct injected 2-strokes weigh more than the old carb motors. The confusion you may be experiencing is that most 20v had the lighter carb motors from birth. When you step up from there to the 4-stroke it is a huge difference in weight. Example

I have a 200 carb Merc 2-stroke that is fairly light at 389 lbs.

The smaller Verado 4-cyl 200 4-stroke is 510 lbs. The 225 6cyl is 635 lbs.
The Merc 200 Opti 2- stroke is 497 lbs.

Right now the bracket on my 20' cc is riding pretty high so I don't think I am getting any bouyancy from the bracket. I don't have a self bailer so I can't help you answer the bailing/not bailing riddle.

I might be happy with the performance of the 150 4-stroke but my wallet has decided to go with a rebuilt 250 EFI in the next few weeks at 475 lbs. I would be happy to share some images of how she does with the extra 90 lbs. Weight would be very close to the Yamaha 150 4-stroke.
:sly:

[randlemanboater]

My 20" Johnzuki 140 4 stroke is said to weigh 410#s.

I think it depends on which 4 stroke you are looking at and to which 2 stroke you are comparing it to.

[bcmarinamanager]

The problem you run into with the weight issue on a bracket is the "moment arm." Sure 40 lbs doesn't sound like a lot of weight, but when you take that 40lbs and move it two feet further from the center of bouyancy it acts like upwards of 100-200 lbs. So, basically the farther you get from the CB the greater the "moment" is for a given weight. It's kinda like what a doctor tells you about picking something off the floor and bending at the waist: 10lbs puts 1000lbs of pressure on your lower back. The weight difference probably wouldn't be that big of a deal if you weren't using a bracket since the weight would be closer to the CB. Two strokes have more power anyway!

[bigshrimpin]

I keep reading about the concerns of putting a 4 stroke on a bracket due to weight.

I'm looking as yamaha's website and the 150 4 stroke is just 40 lbs. more that the same size 2 stroke model.

Am I missing something with respect to weight that they are not displaying on the specs sheet?

I was almost convinced that I had to go with 2 stroke just from reading posts, but if I can, i'd really like to go 4.

Mid 80's Mercury 2.4L 200hp is only 360lbs!! and they are pretty good on fuel.

http://www.nadaguides.com/default.aspx?LI=1-24-38-5694-0-0-0&l=1&w=24&p=38&f=5697&m=0013&y=1988&ml=M&gc=MR&gtc=OB&d=17001302904

[spareparts]

you also have to realize how they weigh engines now, there has been a lot of discusion in several magazines comaring actual weight and advertised weight. Bass and Walleye magazine had an article a few years back that weighed each engine in a as installed running engine with all gear needed for it to operate. It created a lot of heat from the manufactures. For example on a Merc verado, its weighed without a prop(no big deal), gear lube(can't be that much), engine oil and filter(hears a few more pounds), zincs(adding a few more), power steering assembly(big verados only, but you have to have to run the engine, and it weighs a fair amount), so by the time your finsihed, you've added a few hundred pounds(maybe not that much), but you see the point I'm making, on the old 2 strokes, all you added was prop and 2 stroke oil to the weight, so comparing newer engines to older ones can be missleading. From what I remember, the magazine weighed a 250 Yamaha, 250 Suzuki, 250 Verado, and a 250 Honda, all four strokes(some reason they didn't have e-tecs, HPDI's or Opti's in the article, may have been a later issue), all as installed weight to be operational including controlls and any standard item needed to operate the engine. I don't remeber the actual weights, but they all ended up being close to 200 lbs heavier installed, I think the merc was even heavier stripped down than advertised. So when you are comparing weights, just remeber to compare apples to apples