Tohatsu 9.8 4st problems

Any details you care to add about rebuilds, problems solved, how to do etc,
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zebedee
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Re: Tohatsu 9.8 4st problems

Post by zebedee » Sep 3rd, '18, 22:03

We call them a mash hammer. Or a "thud".
A man's boat is his Castle. The Gippsland Lakes are my moat. Castle 650 #10, Roller Coaster.

Frank Peters
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Re: Tohatsu 9.8 4st problems

Post by Frank Peters » Sep 13th, '18, 15:58

Hi All,
My Tohatsu 9.8 4st is finish and ready to be installed.
After I reshape the cowl, it is good fit.
I am going to write the manual for fitting Tohatsu 9.8 4 st to Noelex 25 without rudder extension on 2018 model.

Then I post it to people as a reference to help and to simplify this procedure.

Only one question I have and it is the propeller.
What type of propeller people use on this motor?
Regards Frank

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MargGannet
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Re: Tohatsu 9.8 4st problems

Post by MargGannet » Sep 13th, '18, 18:21

Hi Frank,
I bought the high thrust propellor with the motor... Works well.
has four blades, numbers on it say 8.7 x 5 I think...

Cheers,
Marg
Marg
Special Edition NX 25,
LC 80 series
Bayswater North, Vic

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barnaclephill
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Re: Tohatsu 9.8 4st problems

Post by barnaclephill » Sep 13th, '18, 19:57

Marg is correctly. 4 blades at 8.75 diameter and 5" pitch.
A fantastic motor and propeller combination.
Frank you need to match the number of splines too.
Northerner28.

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zebedee
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Re: Tohatsu 9.8 4st problems

Post by zebedee » Sep 13th, '18, 21:40

Adrian has a 4 blade prop on his Tohatsu 9.8 4st, it looks like a high thrust prop. We're transferring it from his old Noelex to his new one at the moment; I'm getting hands on experience with the motor mount in these boats...
A man's boat is his Castle. The Gippsland Lakes are my moat. Castle 650 #10, Roller Coaster.

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Re: Tohatsu 9.8 4st problems

Post by Frank Peters » Sep 13th, '18, 22:18

Hi Marg and All
And thanks to your information. My motor come with mark 8.5 - 3 blades 8.9 x 8.3. I will try it and possibly get high trust if it’s not suitable.
Regards Frank

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Re: Tohatsu 9.8 4st problems

Post by Frank Peters » Sep 20th, '18, 22:40

Hi All,
Today I finally put the Tohatsu 9.8 4 st in my Noelex.
To lift the motor and drop it in took only 15 min, but before that 5 weeks to figure out what to cut and reset.
To do it again would take me one day.
So motor is in and it is perfect.
I have clearance under rudder stock and I rest the linkages for locking the mounting board. I am very happy and fitting Tohatsu 4 st in Noelex without extension is reality.
I have standard prop, and I may modify it later if necessary for better reverse.
Also my dealer in Bairnsdale told me not to buy Tohatsu high trust prop, if I need it, buy Solarex after market, much cheaper.
They also have Tohatsu 9.8 4st with remotes in the shop for good price if somebody is interested.
So if everything goes well we will be on the water on Cup Day.
If anybody needs advice on fitting Tohatsu, send me email.
Regards Frank

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zebedee
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Re: Tohatsu 9.8 4st problems

Post by zebedee » Sep 20th, '18, 23:50

Prop chart for the Tohatsu 9.8:
Toh98Props.gif
Adrian has the 4 blade, 8.7x7 prop on a Noelex.
A man's boat is his Castle. The Gippsland Lakes are my moat. Castle 650 #10, Roller Coaster.

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Re: Tohatsu 9.8 4st problems

Post by Frank Peters » Sep 21st, '18, 22:07

Hi All,
I have considered modification of the propeller by drilling the holes for exhaust escape.

I don’t have the specification and Wanton promise to send it to me.

But as far as today I don’t have it.

Maybe he got confused about the drilling and sent it to EHarmony.
So I am still waiting.

Regards Frank

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Wanton
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Re: Tohatsu 9.8 4st problems

Post by Wanton » Sep 21st, '18, 22:50

My apologies Frank. I have been caught up in life's business. I will attend to your needs tomorrow.
Ed
Wanton C22/110
All I wanna do is sail
http://www.baysidetrailableyachtclub.com
Photo shows Wanton at Nara Inlet, Whitsundays, Qld.
Image

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Re: Tohatsu 9.8 4st problems

Post by Frank Peters » Sep 23rd, '18, 18:32

Hi All,
I did not like Tohatsu 9.8 4 st tiller to stick out and make it difficult getting in and out of the boat.
So I took the motor out of the boat again for more modifications.
I removed the tiller and consider two options.
One to cut and shorten tiller by 100 mm and weld it, or shift it to other side. I did not like any of those options.
So next morning I decided to make small leaver and linkage to carby.
It is straight forward, I drill the hole next to choke and tomorrow I start on the leaver with red ball on the top.
After that I would like to separate output wire of the charging coil and take it through to my regulator already on the boat.
It is slow process, but in bad weather is OK.
Regards Frank

Ukuri
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Re: Tohatsu 9.8 4st problems

Post by Ukuri » Sep 24th, '18, 19:40

Bye bye Warranty!

INMA
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Re: Tohatsu 9.8 4st problems

Post by INMA » Sep 24th, '18, 21:25

Frank, something like this might be useful.

https://www.ebay.com.au/itm/LAWN-MOWER- ... 2a898b9d40
RL24 Mk4 cruiser Mariner 5 2 stroke

A bad day in the Whitsundays is better than a good day at work. Unless you work in the Whitsundays.

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Re: Tohatsu 9.8 4st problems

Post by rseydler » Sep 24th, '18, 21:51

I still believe Frank would go well with this.

https://rover.ebay.com/rover/0/0/0?mpre ... 2220040526

Frank Peters
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Re: Tohatsu 9.8 4st problems

Post by Frank Peters » Sep 24th, '18, 21:54

Hi All,

Thanks for the advice, I know I blow my warranty by modifying the outboard to suit my needs.
I always service my outboards myself, so it disqualified me anyway.
I have new throttle lever nearly finish, it fits next to gear shift.
There is not much room and 6mm ss rod with red ball on top fits neatly.
Hopefully I finish it tomorrow and then test it on the stand.
I am taking photos to put it on the post later on, only the final design probably mark 5.
Regards Frank

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zebedee
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Re: Tohatsu 9.8 4st problems

Post by zebedee » Sep 24th, '18, 22:25

A man's boat is his Castle. The Gippsland Lakes are my moat. Castle 650 #10, Roller Coaster.

Frank Peters
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Posts: 1674
Joined: Apr 19th, '09, 22:34
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Re: Tohatsu 9.8 4st problems

Post by Frank Peters » Sep 25th, '18, 11:09

Hi All,

Tohatsu has absolutely nothing like my replacement for tiller.!!!!!!!!!!!!!!!!!

I don’t need remote controls, only to operate throttle from other side by small lever.

I did make similar set up on my Yamaha and design myself (not Yamaha) 20 years ago.

It served me well, and that’s what I want.

Simplicity!!!!!!!!!!!!! and good function!!!!!!!!!!!!! is my aim and get rid of tiller!!!!!!!!!! on wrong side!!!!!!!!!!!!.

I hope to finish today.

Regards Frank

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Re: Tohatsu 9.8 4st problems

Post by Frank Peters » Sep 25th, '18, 18:37

Hi All,

I spent all day replacing temporary components for final stainless steel ones.

Also I have changed the configuration of linkage and made more room for choke baton.

Tomorrow I have to do more welding, then polishing and assemble the bits together.

Test will be on Friday, then back to be fitted in the boat.

Regards Frank

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Re: Tohatsu 9.8 4st problems

Post by Frank Peters » Oct 1st, '18, 22:16

Hi All,
Finally Tohatsu is in the boat, properly fitted.
The tiller is off and small lever works fine.
Now I find out that Tohatsu does not have locking in straight position.
There is small bracket available, no one stock it.
I will tighten the bolts on the shaft and hope it stays straight.

Now when I look at those two motors, Yamaha and Tohatsu,
it is like choke and cheese or like Holden and Ferrari.!!!!!!!!!!!!!!!!

Yamaha is definitely technically better design, even aesthetically and practically, specially on the leg.
Tohatsu has water coming from 3 different holes and has no regulator for charging batteries.
So primitive.
Why not rectifier and regulator together, it only cost few bucks.
If I was 20 years younger, I would buy Yamaha and cut the long leg no problem.
Now I have some limitations and too much on my plate.
I don’t want to discourage people from buying Tohatsu, this is only my personal experience and I may ad I am bit fussy in engineering design.
I keep you inform.
Regards Frank

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Re: Tohatsu 9.8 4st problems

Post by Mal » Oct 1st, '18, 22:39

Hi Frank
You may need to consider a small tube to pick up the exhaust from the leg as there is a tendency for there to be an accumulation of exhaust in the cabin and cockpit. By extending a line to below the waterline the gas doesn’t come back in.
Don’t know if any one has mentioned this but it is an issue.
BTW I went with the electric start and remote control so no tiller issues - apart from the height. Pretty happy with result.
Mal

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Re: Tohatsu 9.8 4st problems

Post by barnaclephill » Oct 2nd, '18, 00:52

My Tohatsu motor has a charging coil and whatever with long leads. I have never used them, because I use the solar panel. I bought cables for the throttle and gear shift, so all these things are possible.

Too much criticisms Frank. All designs have their merits and their not-so-good points. I'd be interested to see some photos of what you are doing, what changes and challenges you are engineering.
Northerner28.

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Re: Tohatsu 9.8 4st problems

Post by Harb » Oct 2nd, '18, 13:50

Frank Peters wrote: Now I find out that Tohatsu does not have locking in straight position.
There is small bracket available, no one stock it.
I will tighten the bolts on the shaft and hope it stays straight.
Good luck with that. It was designed not to lock it in place, no matter how hard you tighten it the saddle will still allow it to turn.
I used some rope to tie it to a couple of eye pads that were in the right place just
to test it and worked so well I left it like that. For the upgraded motor will be using a more permanent solution
using a a pivoting rod & SS quick disconnect ball joint mounted on the steering bracket which will allow it to trim and tilt freely
in the locked position and easily disconnect it if I want it to turn freely.

Image

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Re: Tohatsu 9.8 4st problems

Post by Frank Peters » Oct 2nd, '18, 18:46

Hi Harb and All,

Thanks for your valuable information and picture.
I am going to put small bracket between chassis and mounting board.
I will never use the motor steering as there is no room.
I have about 15 mm clearance on the side.
And back to the charging batteries.
If you have electric start motor, it has charging coil, rectifier to Dc from Ac but no regulator.
Power goes directly to batteries unregulated whether you like it or not, possibly make your battery boil.
So if you don’t want to use the charge, you must cut the wire going to starter motor heavy cable, or put in cheap regulator.
Regards Frank

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Re: Tohatsu 9.8 4st problems

Post by pdandy » Oct 6th, '18, 18:27

Frank, never say never. I've used the limitted "steering " ability of suzy in the well 2/3 times - basically when reversing into particularly awkward berths with wind / current fighting to encourage the noelex into places I don't want her.
noelex 25 green velvet

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Re: Tohatsu 9.8 4st problems

Post by Frank Peters » Oct 17th, '18, 21:58

Hi All,
I am nearly finished with re powering my Noelex and now I have few more jobs to do to get ready for sail on Cup day at Paynesville.
I have to shift the number plate about 100mm out as it is obstructed by bracket holding back rollers.
In this process I also change the trailer back lights to LED.
Local auto electrician has them really cheap, $22 each, but small LED light for number plate costs $24. No big deal.
Tomorrow I do the connections, and water proof the lot.
Then the next job will be to empty the locker to get access to electrical connections for Tohatsu.
That should be reasonably easy.
Then clean up all boat storages and get fresh supplies of essentials, like bear, wine, sun screen and tomato sauce.
I hope the Tohatsu run OK, if not I see the J ambassador!!!!!!!!!!!.
Regards Frank

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