1999 Mariner 125hp carbed 2 stroke autolube

carholme

Rear Admiral
Joined
Sep 4, 2010
Messages
4,845
Re: 1999 Mariner 125hp carbed 2 stroke autolube

From the manual:

4750-5250

If you would like a copy of the manual. drop me a PM with an email address and I will send it to you.


Gerry
 

headlight

Cadet
Joined
Jan 20, 2010
Messages
20
Re: 1999 Mariner 125hp carbed 2 stroke autolube

Thanks for the info Gerry.
The engine is on a Raider 18ft which is a British built fast fisher weighing about 1,400lbs that my friend bought a couple of months ago.
The engine has only done 120 hours & is in perfect condition.
The prop is a 13.25" Laser 2 with 20" pitch.
We took the boat out this weekend to see how it performed & TBH were a little disappointed.
Acceleration was excellent & the boat topped out at 30.5kts at 5,200rpm.
That would suggest that the boat is correctly propped.
However I have an identical boat with 10hp less & we were expecting at least the same top speed.
My engine is a Honda 115 EFI running a 13.25" x 15" pitch stainless Honda prop.
This gives 36kts at 5,600rpm
Given that the gearbox ratios of both engines are almost identical (2.07 for the Honda & 2.08 for the Mariner) the fact that the Mariner revs 400rpm less flat out should be more than offset by virtue of the much bigger pitched prop I would have thought & we were expecting the Mariner engined boat to be at least as quick as mine if not quicker ?

headlight
 

Dave1027

Lieutenant Junior Grade
Joined
May 25, 2010
Messages
1,081
Re: 1999 Mariner 125hp carbed 2 stroke autolube

Something does not sound right. The Mariner with a 20 pitch prop should be going in excess of 40 mph. How is the Honda with a 15 pitch kicking it's butt?
 

dfrants

Petty Officer 1st Class
Joined
Jul 26, 2008
Messages
399
Re: 1999 Mariner 125hp carbed 2 stroke autolube

i'm not familer with that make of boat, but i have the same merc model as yours on a 17'Nitro. a 22" balistic topped at 51mph and a 26" laser II hit 57mph. does anyone know at what rpm the rev limited kicks in at?
 

Dave1027

Lieutenant Junior Grade
Joined
May 25, 2010
Messages
1,081
Re: 1999 Mariner 125hp carbed 2 stroke autolube

I don't think those motors have rev limiters. The electronics are very basic.
 

headlight

Cadet
Joined
Jan 20, 2010
Messages
20
Re: 1999 Mariner 125hp carbed 2 stroke autolube

This is a pic of another friends Raider 18, this one runs a 135 Optimax
He hits about 40kts.

headlight
 
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