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 Post subject: Re: Best outboard for an investigator563
PostPosted: Tue Jun 28, 2016 5:16 pm 
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Joined: Mon Jan 17, 2011 11:19 am
Posts: 378
Location: Zeerust Victoria
I suspected this might be a problem which is why I thought a pre-measured 800ml bottile might be handy.

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Peter
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 Post subject: Re: Best outboard for an investigator563
PostPosted: Wed Jul 04, 2018 2:20 pm 
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Joined: Sun Aug 18, 2013 11:33 am
Posts: 140
Location: Townsville, Qld
Hi all, good topic, i'm investigating 2 stroke motors due to the 2 stroke ban beginning.

Had a very detailed and long (1hr!) yarn with the local Tohatsu rep (also a good mechanic) at their workshop, hidden away in a back street of an industrial zone. They have a very different approach to sales and maintenance to the "big names" around (Yamaha, Mercury etc} They don't keep much stock but just order in exactly what is required which takes about 4 days,

I was after Tohatsu 4-5hp longshaft 2st on arrival. but not so sure now. He is very cluey on the power and prop requirements for small heavy yachts. The owner suggested that a 6,8 or 9.8 hp with a 6" pitch bigger prop (to give high thrust) would be better and push an investigator into a very strong wind/sea and tide race situation. (like whats found in the Whitsundays). They all have the same engine specs and all weigh 26kg's (different carby's) (They also have a good folding outboard trolly if moving it becomes an issue.)

We got into allot of mechanical/maintenance detail. The 4-5hps wear out their rubber steering bush faster, the 6-9s have a much more robust set up which lasts for life. Many parts are interchangeable over time, eg Modern lower legs can bolt straight onto 30 year old motors. The removal of the lower leg for impeller maint is easy, with an exposed connector for the gear shift rods. The ignition advance was old school solid mechanical. A decent looking fuel filter was in there (better than the Johhno's piece of ss gauze). They can be fitted with alternator battery recharging system via a rectifier to convert the AC into DC. The fuel pump is more robust than the 4-5hps ones. They are their best sellers for small yachts. The only real changes over the years were to ignition electrical components, the hardware is all the same dimensions over time.

Says the 6" pitch means the motor can run at higher revs, better for a 2st motor. The boat will have better low speed acceleration, ie recover faster from large wave knock backs.

so which power size to choose 6, 8 (or more.?)

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Andrew
Investigator #9 Teria
Townsville


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 Post subject: Re: Best outboard for an investigator563
PostPosted: Thu Jul 05, 2018 8:55 am 
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Joined: Sat May 05, 2012 4:25 pm
Posts: 174
Location: Gold Coast
As there is no weight penalty between the models, I'd go for the 9.8hp model. It will maintain the speed you want at lower revs and be quieter doing it (and probably use less fuel). I normally run my (15hp) outboard at only a little above idle and it is very quiet and fuel efficient. (I haven't had any issues with plugs fouling.) It is also good to know that there is plenty of power available when you need it. You will be also future proofing yourself if you move to a larger TS.

If you look after your new purchase, you might end up with the last remaining workable 2 stroke outboard in Australia in 20 years time. Could be worth a fortune.

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Ray
Investigator #39


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 Post subject: Re: Best outboard for an investigator563
PostPosted: Thu Jul 05, 2018 11:59 am 
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Joined: Mon May 25, 2009 7:10 pm
Posts: 834
Location: Sydney
6 hp is more than enough. I went for the 6hp Sailpro and it never gets over just past starting revs most times.

The 6 hp 4 stroke Sailpro was roughly the same price as the 2 stroke long shaft and has an extra long shaft. A bit hard to move around and I had to raise my stand, but great for keeping the prop submerged in broken choppy water.
I lost my shearpin in the "washing machine" area of Pittwater with the 5hp long shaft due to the engine racing and then dropping back. Most embarassing as there was no wind and I had to ask for a tow back to the ramp.

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Ian B
Investigator 563 #50 Yara
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 Post subject: Re: Best outboard for an investigator563
PostPosted: Mon Aug 26, 2019 6:00 pm 
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Joined: Sun Aug 18, 2013 11:33 am
Posts: 140
Location: Townsville, Qld
Quote:
6 hp is more than enough. I went for the 6hp Sailpro and it never gets over just past starting revs most times.

The 6 hp 4 stroke Sailpro was roughly the same price as the 2 stroke long shaft and has an extra long shaft. A bit hard to move around and I had to raise my stand, but great for keeping the prop submerged in broken choppy water.


Sounds like the Tohatsu sailpro 4-stroke could be good for some long range cruising (and return, to deadlines). I was reading a blog https://backbeatsailing.wordpress.com/2013/05/28/tohatsu-6-hp-sail-pro-review/ and the owner was very happy with it. he cruises a 25fter at about 5knots on 1/3 throttle, it sips fuel - ran for 11.5 hrs on a 3 gallon tank, plus is quiet. The price was much less than 9-10hps he was looking at.

Ian, you mentioned it comes as a package - extra long shaft, sailboat propeller, and charging (tho this isn't much at 1/3 throttle), weight still reasonable, all good points.

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Andrew
Investigator #9 Teria
Townsville


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 Post subject: Re: Best outboard for an investigator563
PostPosted: Thu Sep 19, 2019 9:08 am 
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Joined: Sun Aug 18, 2013 11:33 am
Posts: 140
Location: Townsville, Qld
Hi All,

Decided on retiring the old 2 stroke Johnson and going to a Tohatsu Sailpro 4st 6hp extralong shaft (without alternator)

The old 2st Johnson 9.9HP, now 40 years old, motor needed a new gearbox shaft seal fitted, that alone was $300. the service would be an extra $500 or so, there's are other issues like the tiller handle cogs are jumping and the carby. It was to be around a $950 repair bill. So cut loose, bought her home in bits, for her old age retirement in the container..

Went to Townsville Tohatsu dealer and paid deposit on an ultra long shaft sailpro 6HP. Its being shipped in so arrives late next week. they will do a pre-delivery preventative-maintenance ( pull apart lower leg, grease shaft and check torque on nuts) and 1 hr freshwater tank run to seal the gaskets for extended saltwater use. Checked out the u-tube videos on the sailpro, the main thing noticeable is how quiet it is and that it pushes some sizable yachts about. Thanks Ian for your reviews and comments on this engine, (and also everyone who had their ideas on engines too, very informative)

Looking forward to upgrading to the new motor. Quiet, economical, reliable, clean, long-range motor cruising ..visions of Hinchinbrook channel, lake Tinaroo (Atherton tablelands)..!

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Andrew
Investigator #9 Teria
Townsville


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