My F150 does not have low water pick up, as with many of the lower hp Yamaha engines. I am at the point where I can no longer raise the engine due to H2O psi fluctuations. Somewhere, I read about blocking off the upper portion of the factory intake screens to decrease air intake. It sounds perfectly logical. Does anyone have info or experience with this? I am seeking only an additional 1/4 to 3/8 lift.
Allison XB-21 ProSport
Yamaha 250 SHO
Croxton Razor 4XL
The Merc owners do it all the time. They use machine screws to plug the top intake holes. I don't know of anyone who has done it to a Yamaha but I would think it would be possible.
They don't use machine screws... They use SS set screws I believe 5/16 in size.
Not sure what it would take for a yamaha LU.
Marks Props 317-398-9294, 1850 East 225 South, Shelbyville, Indiana 46176 propellerman59@gmail.com http://www.marksprops.com/index.html
Somewhere I read about blocking off the top portion of the Yamaha water inlet cover. Installing a true LW PU on my LU is overkill.
Allison XB-21 ProSport
Yamaha 250 SHO
Croxton Razor 4XL
Part number 12 in the below link.
http://parts.yamaha-motor.com/...2,2,0
Allison XB-21 ProSport
Yamaha 250 SHO
Croxton Razor 4XL
Well, I blocked off the top section of the water intake grates, and it works. I was able to raise the engine another 1/2". Pressure actually increased and was very steady.
Allison XB-21 ProSport
Yamaha 250 SHO
Croxton Razor 4XL
What did you use to block them off? Part # 12 above looks like it's for a lawn mower.
Mike
In Memory of Michael
Fantastic Father and Loving Son
A true man at 23 years old
"What was once a great country has been mortgaged and bankrupted by the egos and ethics of career politicians."
I removed the intake covers and filled the top section of the intake cover with epoxy. I simply taped off the cover on the front side and filled it from the back. The engine was elevated to the point were the top portion of the intake was sucking air. Seems to work quite well.
Allison XB-21 ProSport
Yamaha 250 SHO
Croxton Razor 4XL
<TABLE WIDTH="90%" CELLSPACING=0 CELLPADDING=0 ALIGN=CENTER><TR><TD>Quote, originally posted by abu-guru »</TD></TR><TR><TD CLASS="quote">What did you use to block them off? Part # 12 above looks like it's for a lawn mower.</TD></TR></TABLE>
Definately a wrong link.
Allison XB-21 ProSport
Yamaha 250 SHO
Croxton Razor 4XL
http://parts.yamaha-motor.com/...173,2
I'm sure at one time the previous link was good.
Oh well, this link is good. Parts 12 and 13.
Modified by PSM207 at 5:27 PM 12/18/2007
Allison XB-21 ProSport
Yamaha 250 SHO
Croxton Razor 4XL
Good idea, no need for me to try it though I think i'm perfect.
How did raising the motor work out?
Mike
In Memory of Michael
Fantastic Father and Loving Son
A true man at 23 years old
"What was once a great country has been mortgaged and bankrupted by the egos and ethics of career politicians."
It worked well for top speed, and gave me a few 1/10's of mph. I run a F&S, so at times I drop it back down in order to ski.
Allison XB-21 ProSport
Yamaha 250 SHO
Croxton Razor 4XL
I picked up 1 mph after the console and all the guages were changed out
Mike
In Memory of Michael
Fantastic Father and Loving Son
A true man at 23 years old
"What was once a great country has been mortgaged and bankrupted by the egos and ethics of career politicians."
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