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#11475809 - 03/14/16 05:22 AM RPM's for Phoenix
Jigfish Offline
Extreme Angler

Registered: 02/28/03
Posts: 2726
Loc: Tx
I have a 2015 920 Phoenix with 250 Show Yamaha. Going about 65mph I'm getting about 4000 RPM's. Is that right or should I be getting more?
_________________________
Thanks,

Kaufman High School Boat Captain

The weak call it obsession, the strong call it dedication!
Jigfish


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#11475842 - 03/14/16 06:33 AM Re: RPM's for Phoenix [Re: Jigfish]
Flippin-Out Offline
Extreme Angler

Registered: 02/25/15
Posts: 1564
Loc: Magnolia, TX
RPMs don't get associated with any particular boat. For any given boat/motor/prop combination, the proper prop should be selected. The rig should be propped so that the engine runs just at the maximum engine-manufacturer approved RPMs. Generally speaking, if the pitch of a prop is too low for a boat, the engine will over-rev the RPMs and the rev-limiter will kick in. For a prop with pitch too high, the engine will bog down and never achieve the power rating intended by the manufacturer. That power level depends on reaching the max RPM.

I don't know what the max RPM is for your particular engine, but most SHO's state 5000-6000 RPM as the max power range, so you appear to be WAY out of line at 4000 RPM. You are either grossly mis-propped, have an improper engine height, or a mechanical issue. The proper prop on that boat should allow a 250 SHO to run 5000+ RPM.

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#11476898 - 03/14/16 02:42 PM Re: RPM's for Phoenix [Re: Jigfish]
gary purdy Online   content
TFF Guru

Registered: 05/24/03
Posts: 10509
Loc: Littlefield Tx & Lake A. H. US...
Could be the tach.
_________________________
“The world will not be destroyed by those who do evil, but by those who watch them without doing anything” GOD IS GOOD

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#11478376 - 03/15/16 07:59 AM Re: RPM's for Phoenix [Re: Jigfish]
Josh@SCP Offline
Angler

Registered: 04/27/07
Posts: 385
Loc: Winnsboro TX
If you are running 4000 rpm at wide open throttle trimmed up with the boat running 70 something mph then you have a tach issue. If it is doing none or only part of what I just mentioned then give me a call and either me or stve will help you figure out if you need a prop shop or a mechanic.
_________________________

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#11479550 - 03/15/16 04:53 PM Re: RPM's for Phoenix [Re: Josh@SCP]
Chris B Online   content
TFF Celebrity

Registered: 05/02/03
Posts: 5728
Loc: Prosper, TX
4000 Rpm's at 65 mph? Something isn't adding up or that is one fast boat. I would get the tach checked like stated above.
_________________________

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#11503446 - 03/26/16 10:02 PM Re: RPM's for Phoenix [Re: Jigfish]
Jigfish Offline
Extreme Angler

Registered: 02/28/03
Posts: 2726
Loc: Tx
I took it back into fun and sun and they supposed to have replaced the Tach but I have run it a week and still running no more then 4000 rpm's.
_________________________
Thanks,

Kaufman High School Boat Captain

The weak call it obsession, the strong call it dedication!
Jigfish


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#11504882 - 03/27/16 08:36 PM Re: RPM's for Phoenix [Re: Jigfish]
Allison1 Online   sleepy
TFF Guru

Registered: 12/14/03
Posts: 16292
Loc: Grand Prairie, Tx
Something is wrong. At 4000 rpms @ 65 mph your prop would have to be thirty something to be right. If you are doing 65 GPS you must be doing at least in the low 5000 rpm's.

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#11505266 - 03/28/16 03:36 AM Re: RPM's for Phoenix [Re: Jigfish]
papamark Offline
Mini Tractor

Registered: 04/28/05
Posts: 10466
Loc: Winnsboro
I have a 921 with a 250 SHO and at 70 I am turning around 5500

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#11505655 - 03/28/16 09:16 AM Re: RPM's for Phoenix [Re: Jigfish]
Jigfish Offline
Extreme Angler

Registered: 02/28/03
Posts: 2726
Loc: Tx
Yea, that's 65GPS and not over 4000RPM's
_________________________
Thanks,

Kaufman High School Boat Captain

The weak call it obsession, the strong call it dedication!
Jigfish


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