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#11303538 - 12/25/15 05:19 PM Jasper lower unit?
stratos1 Online   content
Outdoorsman

Registered: 12/09/04
Posts: 25
Loc: richland hills
Can a lower unit cause loss of rpm ? And why ?

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#11303762 - 12/25/15 08:17 PM Re: Jasper lower unit? [Re: stratos1]
Dubee Offline
Extreme Angler

Registered: 07/17/11
Posts: 1303
Loc: Godley Tx
Yes

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#11303854 - 12/25/15 09:29 PM Re: Jasper lower unit? [Re: stratos1]
kingdad101 Offline
TFF Guru

Registered: 10/24/05
Posts: 20721
Loc: W.F. Texas
does it have the same gear ratio as the old one...
_________________________

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#11304171 - 12/26/15 08:52 AM Re: Jasper lower unit? [Re: stratos1]
stratos1 Online   content
Outdoorsman

Registered: 12/09/04
Posts: 25
Loc: richland hills
It has the gear ratio as the motor year calls for,1998 Evinrude 225. Dubee, you say yes. Besides gear ratio how?
Never checked the ratio before the other one trashed, so really don't no.

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#11304242 - 12/26/15 09:47 AM Re: Jasper lower unit? [Re: stratos1]
TLW Online   content
Extreme Angler

Registered: 11/16/06
Posts: 2037
Loc: ft worth
how many rpm lost?

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#11304280 - 12/26/15 10:05 AM Re: Jasper lower unit? [Re: stratos1]
stratos1 Online   content
Outdoorsman

Registered: 12/09/04
Posts: 25
Loc: richland hills
between 400 to 500 rpms

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#11304293 - 12/26/15 10:13 AM Re: Jasper lower unit? [Re: stratos1]
Flippin-Out Offline
Extreme Angler

Registered: 02/25/15
Posts: 1580
Loc: Magnolia, TX
Could the prop have been damaged (bent) and not noticed?

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#11304294 - 12/26/15 10:14 AM Re: Jasper lower unit? [Re: stratos1]
stratos1 Online   content
Outdoorsman

Registered: 12/09/04
Posts: 25
Loc: richland hills
Had the pitch on the prop changed from 24 to 22, got rpms back up to 5800. What is weird is the 24 pitch 4 blade will run 6000 rpms. Both are 14 1/4.
The rpm drop was right after new lower unit put on.

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#11304297 - 12/26/15 10:15 AM Re: Jasper lower unit? [Re: stratos1]
stratos1 Online   content
Outdoorsman

Registered: 12/09/04
Posts: 25
Loc: richland hills
No prop damage.

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#11304336 - 12/26/15 10:37 AM Re: Jasper lower unit? [Re: stratos1]
Dubee Offline
Extreme Angler

Registered: 07/17/11
Posts: 1303
Loc: Godley Tx
Could be gears not meshing correctly.

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#11304344 - 12/26/15 10:41 AM Re: Jasper lower unit? [Re: stratos1]
TLW Online   content
Extreme Angler

Registered: 11/16/06
Posts: 2037
Loc: ft worth
sounds like a different gear... if something wrong and/or bad in tha gear case usually it (or motor) isn't long for this world...


Edited by TLW (12/26/15 10:44 AM)

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#11304473 - 12/26/15 12:16 PM Re: Jasper lower unit? [Re: stratos1]
stratos1 Online   content
Outdoorsman

Registered: 12/09/04
Posts: 25
Loc: richland hills
Does to me to.

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#11305476 - 12/26/15 11:04 PM Re: Jasper lower unit? [Re: stratos1]
LOSTTEXAN Offline
Outdoorsman

Registered: 05/10/09
Posts: 43
Loc: Pensacola, Fl
I'm thinking Different gear.

You haven't talked about GPS speed difference, which would clue us in.
_________________________
Grew up on Tawakoni and Texoma before hybrids and stripers existed on either.

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#11305750 - 12/27/15 09:22 AM Re: Jasper lower unit? [Re: stratos1]
stratos1 Online   content
Outdoorsman

Registered: 12/09/04
Posts: 25
Loc: richland hills
Went from right at 70 to 62 gps.

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#11306774 - 12/27/15 06:01 PM Re: Jasper lower unit? [Re: stratos1]
gary purdy Offline
TFF Guru

Registered: 05/24/03
Posts: 10768
Loc: Littlefield Tx & Lake A. H. US...
Sounds like you got a 1.75-1 instead of a 1.86-1
_________________________
“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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