So I have been given an older 1995 polar craft that has a 40 force which other than a bulb replacement has run flawlessly this entire season. It is a great boat for the creeks and the fishing I do and I would like to keep it for at least the next 2 seasons. However, the boat really needs a 50 or 60. On plane, I run in the 3800 - 4200 rpm range and burn a good bit more fuel loaded which I am a lot. At the lower RPMs, 3200-4000, the boat feels like it is dragging and does not perform well.
After reviewing the carb specs on Boats.net, my 40 force has a 50hp carb set up with the only difference I see is the jet size. With the bulb issue, I was going to install a water separator and all new lines this off season, but while there thought I might get the jets increased.
I come from the old school time of if it ain’t broke don’t fix and this seems like one of those cases. However I really would like an extra 5-10 horse power for what seems to be little money and little work. The question is, “Would you do it?” If so, “Who would you have do it?”
The line replacement I can do, the carb update I know I will mess up. I appreciate the input.
I wouldn’t change a thing! How much of a hurry are you in? I’m retired and sometimes find myself in a hurry! I cuss when someone doesn’t go,when the light changes and such! Sometimes I have to stop myself and say to ME where do I have to be? I let it go, kind of:wink:
I wouldn’t change a thing! How much of a hurry are you in? I’m retired and sometimes find myself in a hurry! I cuss when someone doesn’t go,when the light changes and such! Sometimes I have to stop myself and say to ME where do I have to be? I let it go, kind of:wink:
Really how much more is 5 to 10hp going to make a difference…Again if it aint broke don’t fix it. The words “works flawlessly” and boat mean a lot to me.
You could look into a different smaller pitch prop, you want go any faster, but should help with the bogging feeling, and get your rpms up.
As far as the carb being able to changed to a 50 hp, need to also check part numbers on the head. A lot of times it will look like just changing a couple of jets you will get more power. Most of the time the head will have to be changed. I was ordering carb. parts on boats . net and thought I could bump my 90 to a 115 until I did a little more looking, and found the heads would have to be changed.
I am not sure faster is so much what I am looking for. It is better performance for the boat and until the motor is at 4200 rpm the boat feels like it is dragging. I was thinking a prop adjustment, but she tops out at 5000-5400 rpm depending on the load which is right in line with the specs for the motor.
If I could pick up 5-10hp for 0 weight gain and low cost, I would assume that would have to give the boat a little better performance. However, I have a hard time justifying messing with a motor that starts the first key turn every time…
quote: On plane, I run in the 3800 - 4200 rpm range and burn a good bit more fuel loaded which I am a lot. At the lower RPMs, 3200-4000, the boat feels like it is dragging
Your prop has too much pitch. It should run closer to 5600 rpm loaded. That will make a big difference.
The 5-5400 rpms at wot , is that with the motor trimmed all the way up?
I dont know about the Force, I know this would be comparing apples and oranges. When I spoke with Yamaha Corp rep. about proping my 250, he said that wot rpms should be obtained with the engine trimmed to the middle. Another words middle being from trimmed all the way down. Then use that rpm to start with, depending on heavy load, and light load.
I would try to find a differnt prop to try, before modification is done to the one you have.
It is a 20 year old Force.
Any motor looses power over the years, a few percent per year. So, you’re probably producing more like 35hp or less, maybe, sort of, I think.
Consequently, putting new Jets won’t get you 10hp. More like 7 or 8, at most.
And, it is a 20 year old Force/Chrysler. If it is still running, its a miracle. No matter what you do (jets, prop, whatever), you’re not going get much improvement. Take good care of it and run it 'til it dies.
17’ Henry O Hornet w/ Johnson 88 spl
26’ Palmer Scott project hull
14’ Bentz-Craft w/ Yamaha 25
I ran into a guy putting in at a boat ramp on Murray this summer that had one of those old square looking Chrysler outboards. Actually cranked right up and sounded pretty good. Couldn’t believe it. Think he said it was late 60s.
