Dinghy Motor Replacement Results
Posted: Thu Nov 22, 2012 8:15 am
Dinghy Motor Replacement Results
We gave up on the 1976 Mercury 2 stroke 9.8 horse motor (with 12 horse jets and reed valves)
Replaced with a Yamaha 2 cylinder 2 stroke 8 horse motor in new condition.
It weighs only 60 lbs.
The Yamaha 8 takes our 10.5’ high pressure air floor dinghy to 15 kts/17.3 MPH with two adults on board.
Planes effortlessly at 10 kts.
Once we repair/replace the somewhat rough edged prop we should do a bit better.
The Yamaha starts on the first pull, uses 100:1 fuel oil mix compared to 50:1 on the Merc resulting in less smoke, is much quieter, what a difference in noise plus the nearly all the exhaust flows out through the prop.
The biggest surprise is that the published weight difference is negligible at 4 pounds, however with the large built in handle at the front it is far easier to heft on/off the dink and back to the garage where it will receive a new impeller shortly.
Maybe it’s a bit more compact than the gangly old Merc.
Thank y’all for your input on this one. I am really glad I passed on the 90 pound 9.9 Yamaha.
That 60 lb Yamaha 8 will be a breeze to stow in the lazarette and I can still use the St Croix mini crane if I need to/want to when I become an even older fart.
RWS
We gave up on the 1976 Mercury 2 stroke 9.8 horse motor (with 12 horse jets and reed valves)
Replaced with a Yamaha 2 cylinder 2 stroke 8 horse motor in new condition.
It weighs only 60 lbs.
The Yamaha 8 takes our 10.5’ high pressure air floor dinghy to 15 kts/17.3 MPH with two adults on board.
Planes effortlessly at 10 kts.
Once we repair/replace the somewhat rough edged prop we should do a bit better.
The Yamaha starts on the first pull, uses 100:1 fuel oil mix compared to 50:1 on the Merc resulting in less smoke, is much quieter, what a difference in noise plus the nearly all the exhaust flows out through the prop.
The biggest surprise is that the published weight difference is negligible at 4 pounds, however with the large built in handle at the front it is far easier to heft on/off the dink and back to the garage where it will receive a new impeller shortly.
Maybe it’s a bit more compact than the gangly old Merc.
Thank y’all for your input on this one. I am really glad I passed on the 90 pound 9.9 Yamaha.
That 60 lb Yamaha 8 will be a breeze to stow in the lazarette and I can still use the St Croix mini crane if I need to/want to when I become an even older fart.
RWS
But at our age Christmas is when we want it to be present wise! 