50hp tohatsu 15" parts/mods

[airtime.]

hey all.. Great forum
Im from australia and currently got a D2 50hp tohatsu 2 stroke motor that soon ish i am planning on doing a rebuild.. I am starting to get a knocking sound at idle and full rpm as I need replace the bearings.. So i was thinking i want to up the motor a bit and get some performance parts for it instead of replacing most the stuff with original parts.. BTW motor is on a Caesar thundercat.

I am having trouble finding Performance parts for the 50 tohei in aussie land.. Can someone help me source some?? Is there a 1 stop shop that i could ship over from US?
I have read through the mod50 threads but still cannot source some things..

Also have herd that some 70 carbs bolt straight onto the 50 block Or with minor modifications?? is this true? I Would like to go bigger and better quality parts, If that makes sense?

Still got lots of questions to ask but im sure this will keep you busy

Cheers, airtime

[mcyama]

I had built several Earlier model tohatsu's about 20 years ago.All were of the 40-50 hp 3 cylinder block,and ran 55+knots on a lite rig appx 450#. I still have quite a few parts including new crankcases, pistons and rings. Ialso have the prop that we ran, If you are interested in anything let me know. The dual swirl combustion chamber motor responds well to carbs and compression. then proceed to time and area. thanks Martin

[airtime.]

thanks mcyama..
Yeah i have read up alot of the 3 cycl 50hp motors and i agree with you.
Thanks for the offer accept it will be a few months till i start rebuilding the motor.. I am just want to gather every part i want slowly then put it all together..
Just need help finding where all these mysterious aftermarket/performance parts are for this motor..

cheers

[mcyama]

Well, Don't waste a hole bunch of time and effort on this side, because I had to do it all myself. WHO DAT!!! Martin

[Bies]

Tohatsu for Competition Only

By Bass Machines

(360) 373-3839

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<o>
</o>Tohatsu For Competition Only by Bass Machines is a carbureted 50 HP Tohatsu power head mounted on an 8.5-inch Bass Machines tower housing, adjustable bolt-on transom bracket, and lower unit. The engine is complete with steering bars, throttle connection, and fuel hose.
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This engine is approved by APBA, AOF, and NBR for several stock or modified classes. Check with your association to get the current racing rules. Purchase of this engine requires proof of intent to use the engine for competition only. Proof of membership in one of the above national organizations or another similar boat racing organization is suitable for proof of authority to purchase.
<o></o>
The carbureted 50 HP Tohatsu M50D2 power head is imported under a competition waver from EPA and is only available as a complete racing outboard motor from Bass Machines. The carbureted M50D2 Tohatsu is sold worldwide and was sold in the <?xml:namespace prefix = st1 ns = "urn:schemas-microsoft-comffice:smarttags" /><st1:country-region w:st="on">United States</st1:country-region> and <st1:country-region w:st="on"><st1lace w:st="on">Canada</st1lace></st1:country-region> until EPA emissions restrictions caused the same basic power head to be sold only as a fuel injected model complying with all EPA regulations. Parts for the M50D2 power head are readily available from your local Tohatsu or Nissan outboard motor dealer. All specialty-racing components are available from Bass Machines.
<o></o>
General Description:<o></o>
<o></o>
Three Cylinder, Two Cycle, Carbureted
Displacement: 42.5 cu. in. (697cc)
Bore & Stroke: 2.68 x 2.52 in. (68 x 64 mm)
Approximate Weight: 140 lbs.
Induction: <st1lace w:st="on">Loop</st1lace> Charged
Ignition System: Capacitor Discharge, One Coil per Cylinder
Manual Start with Recoil (Electric Start Available)
Water Pump: In Tower Housing Above Lower Unit
Lower Unit Shaft: 11/16<SUP>th</SUP> inches
Shear Pin Hole: ¼-inch
Gear Ratios Available: 17:17 or 16:17

[airtime.]

thanks mate,
Are these the complete custom lowerunit/midsection/transom bracket bass motors?? I think i have seen a few pics.. They look brilliant but I am really only looking at modding the power head/exhaust.

Also taking the silencer off will it do much different or just give that more better noise??? I have seen a few people do it but won't the water tube get really hot? Exposed Directly next to the tuner without some surrounding cover?

cheers.

[Mark75H]

These are std carb powerheads not sold in the US for pleasure use ... nothing high performance in the powerhead.

[airtime.]

oh ok. Well Im from Australia and we don't have the restrictions yet. but thanks.

Im Just looking around for options atm.. So i can find definitely what I want without wasting any money ect. At the end of the day I just want more HP but still fairly reliable motor.

Thanks - great forum, lots of information!

[olmo40]

Why not trade up to a 70hp Tohatsu ?

[airtime.]

Need a short shaft leg and cant really have the 110kg + weight hanging off my transom..

[oyan13]

are you got any idea how to get tower housing/ lower unit for the tohatsu m50d2 bass machines

if any one out their has idea how to get bass machines please reply me at oklinggi02@gmail.com

thanks

[Mark75H]

Call them directly: (360) 373-3839

[stroker smoker]

Don't take the exaust can out just cut the bottom off were the tuner sticks out a few inches and wether it's a 50 or not make sure it has a 50 tuner in it the late model 50s came with the 40 tuner don't know why drill some1 1/16 holes through the gear case were it sqizes the exaust down right under the tuner boysen reed are a must , do yourself a favor and weld the crank jornals while it's out match port the exaust port top and bottom to the cast and to the head 120 thousandths it seems to make them run well you might find somone that has better porting than me I like mercs oh don't forget the rev limiter

[stroker smoker]

And you can cut the starting ring off the flywheel just don't foget to balence it

[airtime.]

cheers mate,
Since i started the thread i Havnt done much performance wise, Just carbon reeds, got the 50hp D1 exhaust, Drilled the holes in the exhaust bit, rev limiters cut, For the cost of them few mods it is definately worth it.. Gained about 4 - 5km top end speed and a bit more crisp acceleration.

I have never heard of cutting the starting ring before - il look into it thanks


I think thats all the basic hp mods covered ??

thanks - airtime