Tohatsu anatomy 101.

[Fast Fred]

I think we should have a Fast Fred tech section. Fred has helped us with several issues when we began the Tohatsu project. Thanks Fred.
Neil Bass

thanks, i don't think i know that much, I do want every body who races to be fast, so when i go whippin by i'll know i'm do in somethin

We have one advantage over the rubber boat racers in that we are not trying to swing a large propeller that releases and grabs hard

thats helpin ya big,

old school would drill and insert pins to keep it together, i miss read.

once welded, i've never seen one fail, no mater how hard ya bash it or who made it,
i just weld them all cuzz thay never fail

[Richard K.C. Mo.]

Point Being!!!

I actually don't know what the rules should be ,they certainly should be followed though, in spirit as well as word.

I remember some one who quit racing when Q towers and 1-1 Lu became available for kg7 merc , allowed 2 mph and took matters out of the hands of driver. I guess that was really the end of SOA as we knew it.
RichardKCMo

[nbass]

Welded Crank Pins & Speciality Racing Parts

Most racing engines have some special parts. The 44xs has a different flywheel and other parts that are different from the stock production powerhead. The OMC A-stock has a different crank than the stock OMC production engine. Look at the Mark 20H, which is all racing product. Fishing engines are not manufactured to stand up against the abuse imposed by high RPM, jerky motion, and the hop and jump prop out of the water conditions.

The Tohatsu M50D2 is no different than any other production engine; it is not manufactured strictly for racing. At the very onset of the project we advised the APBA SORC and others of the need to weld the crank pins. Our 2005 specifications showed that the pins may or may not be welded. That is the manufacturers (Bass Machines) stock specification.

Like I said before, most racers choose not to weld the pins. Most have not had a problem (yet). We offer the engine without welded pins so the racer has a choice, can do the work themselves, and as a savings to the racer. Anyone that wants their engine sent with welded pins can ask for that work to be included.

If off the shelf standard production no special parts engines is desired, stock racing will need to start racing four-cycle engines with fishing lower units, RPM restrictors, and a whole lot of other undesirable stock fishing engine parts. I for one think there should be a class for just such racing.

Just race it, it is only for fun anyway.
Neil Bass

[Fast Fred]

welded or unwelded, the hull goes the same speed, it in no way makes any POWER what so ever.

[bh/]

Richard

[QUOTE=Richard K.C. Mo.;89885] I remember....when Q towers and 1-1 Lu became available.....that was really the end of SOA as we knew it.

Richard; I was quite young when the Q tower came out, but I thought it was the beginning of stock outboard racing as we know it. Tell me, do you watch much of the 'stock car' racing on TV these days, the Fords, Chevs, Toyotas etc? If so do not ever go over to look at one of those stock cars closely. You may never turn your TV on again; -or as Service put it;
"there are strange things done in the mid-night sun"

[G Stillwill]

Acctually when Mercury made the Quicksilver lower units it was the beginning of the hay day of stock outboard racing. The Johnrudes were at the end of there life at that time. You could take a stock KG-4 or KG-7 bolt it on a Quicky and go racing , take six bolts off and bolt it back on a service unit and go fishing or duck hunting. Then came the 20-H same basic castings as the MK-25 with minor changes. When you come right down to it the Quicksilver was the shot in the arm that Stock outboard racing needed.

[Richard K.C. Mo.]

S.o.

bh, i know all that it just seems unstock somehow to go in and work on a stock motor.
I don't race so i don't know the problems 1st hand, i try to spectate at as many races as i can, not many lately.
I do remember my uncle racing a kg7 with a stock lu on a 12' thompson runabout when the quikie 1st came out. There wasn't a lot of diff. in speed except through the turns lower c.g. i guess.
I guess in the tohotsu thing it could be considered a safety issue
, motors live longer don't blow and wreck.
Anyhow good luck to all you racers, maybe i'll see you at a race sometime.
Richard

[jeff55v]

It's complicated...

bh, i know all that it just seems unstock somehow to go in and work on a stock motor.
I don't race so i don't know the problems 1st hand, i try to spectate at as many races as i can, not many lately.
Richard

Richard, I think it's always nice to look back at Stock Outboard's early years. Things were sure great back then! But, I think it's a mistake to compare the early years with today and conclude that we (Stock Outboard) must be doing something wrong. Times change, and as any sport matures, it just naturally gets more complicated. It's just the nature of things. I think Stock Outboard has done a great job of remaining as close to it's begining concepts as possible.
Richard, I hope I can drive south and meet you at a race next year.

[DougMc]

Most racing engines have some special parts. The 44xs has a different flywheel and other parts that are different from the stock production powerhead. The OMC A-stock has a different crank than the stock OMC production engine. Look at the Mark 20H, which is all racing product. Fishing engines are not manufactured to stand up against the abuse imposed by high RPM, jerky motion, and the hop and jump prop out of the water conditions.

The Tohatsu M50D2 is no different than any other production engine; it is not manufactured strictly for racing. At the very onset of the project we advised the APBA SORC and others of the need to weld the crank pins. Our 2005 specifications showed that the pins may or may not be welded. That is the manufacturers (Bass Machines) stock specification.

Like I said before, most racers choose not to weld the pins. Most have not had a problem (yet). We offer the engine without welded pins so the racer has a choice, can do the work themselves, and as a savings to the racer. Anyone that wants their engine sent with welded pins can ask for that work to be included.

If off the shelf standard production no special parts engines is desired, stock racing will need to start racing four-cycle engines with fishing lower units, RPM restrictors, and a whole lot of other undesirable stock fishing engine parts. I for one think there should be a class for just such racing.

Just race it, it is only for fun anyway.
Neil Bass

Thank you and others for posting details.Technical threads like this help me learn more about our motors such as how they work and why. The more detailed answers make my racing more interesting than put the motor on and go.

[Richard K.C. Mo.]

Nbra

Jeff, you'll have to come to Centralia or Shelbyville Ill. if they're on next yr. there will be 4 tohotsu motors i think i think i heard.
Richard.