Question - Maximum HP on a Tohatsu 6.1

Chief Wiggam · 12 March 2009, 16:28

Does anyone have any information on the maximum HP that could be hung off a Tohatsu 6.1 (One design?) Would appreciate any information on the class as a whole and this specific question. I have seen comments in the past that the boats are 'lightly built' but with the advent of the lighter two stroke Evinrudes etc I am wondering if it is weight or power that would be a limiting factor

Thanks

kwil · 12 March 2009, 19:18

They are designed to take 2 stroke engines either 1 x 120hp or 2 x 70hp. I would not put a heavy 4 stroke on as the transon as it is quite low meant for a 20inch shaft. I get just shy of 40 knots with my 115 etec and 17" prop, just over 40knots with the 19" prop. And well over 200 miles range from the built in 160litre tank when cruising at 30-33 knots. If you wanted to go slightly bigger a good match would be the new 115HO etec which I believe actually produces 126hp.

Keith

Rogue Wave · 12 March 2009, 19:21

Tohatsu's are reallysolidly built I've worked on a few and have always been impressed by the build quality they have good strong transoms

richardjawilson · 12 March 2009, 20:53

I hang a 150 opti off the back of my Tohatsu 6.1. The engine is nigh on 200kgs and although the boat goes well imho it makes the boat too stern heavy. In flat water its awesome, but when it starts to get rough she does not like travelling to slowly as she will come off the plane quiet easily. I also have a large A frame and small auxillary as well so that doesnt help the handling.

The fastest I've had out of it was 55.4 mph, but that was on the Thames with some tidal assitance.

I think the tohatsu website says the transom is rated for 120 fyi.

Richard

Chief Wiggam · 13 March 2009, 15:08

Thanks for the information - replies are much appreciated and lots of things to consider - well done Ribnet!

Pete7 · 13 March 2009, 19:56

Think Keith is spot recommending the 115. Rib International managed 54 mph out of one of the early 6.1 with 90 hp and mine did 40 mph with the same engine before she got an Opti 150.

This might be worth a read if you haven't seen it before, written about 98 time if your looking at the price.

http://www.ribmagazine.com/site/inde...=104&Itemid=84

Pete