Posted By: stratos1
Jasper lower unit? - 12/25/15 11:19 PM
Can a lower unit cause loss of rpm ? And why ?
Posted By: kingdad101
Re: Jasper lower unit? - 12/26/15 03:29 AM
does it have the same gear ratio as the old one...
Posted By: stratos1
Re: Jasper lower unit? - 12/26/15 02:52 PM
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.
Posted By: Flippin-Out
Re: Jasper lower unit? - 12/26/15 04:13 PM
Could the prop have been damaged (bent) and not noticed?
Posted By: stratos1
Re: Jasper lower unit? - 12/26/15 04:14 PM
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.
Posted By: Dubee
Re: Jasper lower unit? - 12/26/15 04:37 PM
Could be gears not meshing correctly.
Posted By: TLW
Re: Jasper lower unit? - 12/26/15 04:41 PM
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...
Posted By: LOSTTEXAN
Re: Jasper lower unit? - 12/27/15 05:04 AM
I'm thinking Different gear.
You haven't talked about GPS speed difference, which would clue us in.
Posted By: stratos1
Re: Jasper lower unit? - 12/27/15 03:22 PM
Went from right at 70 to 62 gps.
Posted By: gary purdy
Re: Jasper lower unit? - 12/28/15 12:01 AM
Sounds like you got a 1.75-1 instead of a 1.86-1
Posted By: stratos1
Re: Jasper lower unit? - 12/28/15 04:06 PM
Guess need to check again.