yamaha prov 150

[edjr]

i bought a 87 procraft 19.5 ft with a yamaha pro v 150 what would be the wot rpm range. are there any issues with the motor i need to be aware of.<br />currently it runs around 4900 with a full tank of gas and 2 men with fishing gear. thanks for any info.

 

[WillyBWright]

Re: yamaha prov 150

You're overpropped. You should be turning at least 5500. That's official. Between you and me, they'll run 6 grand all day long and love you for it.

 

[edjr]

Re: yamaha prov 150

now it has a 13 1/2 x 23 what would you recommend going to thats gonna get it up to 5500. is there any truth to 1 pitch is about 200 rpms?

 

[rodbolt]

Re: yamaha prov 150

yes<br /> sometimes you will get as much as 300 per inch. as a two stroke turns up it makes more power. I would try a cupped 13 1/2 by 20 or so.

 

[edjr]

Re: yamaha prov 150

thats what ill try...thank you for the advice..this is a GREAT forum ..ill let ya know how it runs when i get it

 

[edjr]

Re: yamaha prov 150

sry i forgot should i go 3 blade or 4 blade and what are the advantage or disadvantages of either one?

 

[WillyBWright]

Re: yamaha prov 150

3-blades are generally faster. But 4-blades allow you to raise the motor on the transom to push less gearcase thru the water and you can make that up if not get a tad more speed. 4-blades also seem to reduce chinewalk substantially.<br /><br />But I wouldn't think a 23 would be out of line for that setup. You might want to make sure you're running on all 6 cylinders. Check the sparkplugs. They should all burn about the same. If any deposits look radically different than the others, you may have a motor problem.

 

[rodbolt]

Re: yamaha prov 150

a run up on the test wheel or dyno can tell you if the motor is making correct power. reccomended before chasing prop sizes. I am nt familiar with a procraft so I have no idea of the hull configuration or weight.

 

[edjr]

Re: yamaha prov 150

plugs all look same... even discoloration. the weight of the boat is around 2500 lbs..good compression on all cyl. (around 130) good spark.<br />im gonna check to see if someone in our area has a dyno or a test wheel to check it. but as good as the motor starts and runs ( all the way thru the rpm range) im hoping the motor isnt sick. can it harm anything if it contiunes to run at 4900 opposed to 5500?

 

[bigbrownbuku]

Re: yamaha prov 150

its extra load your engine doesnt need ed. in the short term it shouldnt harm much. in the long term your engine life will be reduced due to the extra load.<br />pulling skiers with that rpm could be harmful