1997 johnson 150 prop number

[90srtatos]

i have a viper prop on my boat and was wondering if someone could tell me what it is ,,,its a viper 174815 thanks ,,,,chris

 

[Jcstratt]

Re: 1997 johnson 150 prop number

found this at michigan wheel = 174815 14-1/4" x21"

 

[90srtatos]

Re: 1997 johnson 150 prop number

thanks jcstratt ,,,so the pitch is 21 what direction do i need to go to get more top speed , it planes out really quick so i dont need the hole shot i need more top speed thanks once again chris

 

[90srtatos]

Re: 1997 johnson 150 prop number

bump jcstratt

 

[90srtatos]

Re: 1997 johnson 150 prop number

could someone tell me which direction to go on the pitch up or down for top speed i have a 21 thanks for the input.

 

[sikpnter]

Re: 1997 johnson 150 prop number

Hey again stratos. What is your top speed and what are your rpms?

 

[90srtatos]

Re: 1997 johnson 150 prop number

hey sikpnter still not got the pack yet but ill let you know asap, about 52mph at 5100 rpms

 

[90srtatos]

Re: 1997 johnson 150 prop number

that is trimmed as much as possible

 

[90srtatos]

Re: 1997 johnson 150 prop number

thats on a 20ft fish-n-ski 289 stratos it a pretty heavy boat

 

[sikpnter]

Re: 1997 johnson 150 prop number

Your low on the rpm side for this motor. This motor loves the 5800 range. I have a 18.5 skeeter fish n ski that came with a 21 pitch and I was getting 53 at 5400 rpm so I bought a 20 pitch raker stainless and Im getting 58 mph at 5800 rpms when its not bogging down of coarse. Being low on the rpms is lugging it and will cause problems down the road for your motor. Maybe try dropping a pitch. Do you have a jack plate?

 

[90srtatos]

Re: 1997 johnson 150 prop number

no dont have a jack plate ,so you say i need to go down to a 20 and i will gain a couple of mph maybe even 5 !!!! what kinda prop was the 21 you had ? what brand was it ss?

 

[sikpnter]

Re: 1997 johnson 150 prop number

The 21 pitch was omc aluminum. You need to get your rpms up to let your motor put out its full horsepower. So Im not sure how much more speed you'll get but if you drop a pitch you'll pick up that extra rpm and maybe a few more mph and save your motor. I would drop a pitch,maybe you know someone who will let ya test a prop first. If so even try a 19 if your boat is real heavy. just get those rpms up near 5800