1971 ST70 Dax

Beretta

Member
Just picked up this little Dude, just sorta came my way. It's a 1971 ST70 Dax and doesn't seem to be your normal 70's Dax. All of the decals, which are original are in Japanese.
After hours of research as near as I can find this Bike was brought directly From Japan- most likely by an Individual in the 70's.
Most all of the parts interchange with a 71 CT and appears to be a 4 speed manual shift- 1 up and 3 down . ( see the Paddle Shifter)
Before I decide it's future I've been pricing parts like a new original style Seat ( different than a CT seat)
The handle Bars are also unique with the cross brace will need to be re-chromed along with several other parts. Anyone recommend a good chrome shop ?
Any comments or suggestions for parts would be appreciated !


 

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cjpayne

Well-Known Member
Nice find.
Some of our soldiers had those bikes shipped to the USA back in the day. I have a 70K0 front fender with a Naval pass sticker that I put on my gf's 74K3.
I think your exhaust is a china repop instead of the K0 type. You have a 4speed clutch cover, but the flywheel looks like the 3speed version. I dont know dax's very well, but please post what you find out is original. If I remember right, but I've seen some of these posted here before and they had detachable front ends and had blinkers. I think someone's changed the bars on yours, but might still have the detachable cables, ect. Would like to hear if it does. Please post a pic of the VIN plate.
 

Beretta

Member
I researched the exhaust and it appears to be original as the Holes by the Engine in lieu of the slots I don't believe any nuts and bolts were ever turned on this bike.
There is no typical ID stamped plate on the steering neck - Nor any holes that indicate there ever was one. Chassis number
ST70-4029484.
The headlight ears are original and have holes for mounting the turn signals as well as the signal wiring in the headlight and tail light harness. I'll look closer at the cables tomorrow. Research also indicates the Bars and 4 bolt mount are correct for the 71- Not even close to the CT70's.
As for the Flywheel- It does look like a 3 spd ct70 match- Hell it may be a 3 speed manual shift--I'll get it in the air and run it through the gears by hand and report back.
Thanks for your reply !!
 

cjpayne

Well-Known Member
I'd guess you have a non-export Dax and its a totally different animal compared to the rest. Pretty rare on this side of the world. Cool find.
 

Tripod

Well-Known Member
Different flavors of dax. 3 and four speeds. Some have the removable forks. Some have folding bars, bmx bars. Some have k0 pogo stick forks, some have k1+ hydraulic forks.
 

Beretta

Member
Thanks for comments ! This Bike is Definitely a 4 Speed- 1 up and 3 down- strange from what I'm use to.
Either way I need some suggestions: The wiring is all F^^^^ up- someone cut off the key switch wire and wired up an external condenser for the points- Go Figure that.- Anyhow the basic plan is to get it running as is then Rebuild the engine and begin ordering parts-- Not going to repaint it just make it a Super Runner and keep it as Original as possible--- Any Help or suggestions would be Welcomed !!
If anyone on her has experience with a 71 ST please chime in.
 

Tripod

Well-Known Member
Thanks for comments ! This Bike is Definitely a 4 Speed- 1 up and 3 down- strange from what I'm use to.
Either way I need some suggestions: The wiring is all F^^^^ up- someone cut off the key switch wire and wired up an external condenser for the points- Go Figure that.- Anyhow the basic plan is to get it running as is then Rebuild the engine and begin ordering parts-- Not going to repaint it just make it a Super Runner and keep it as Original as possible--- Any Help or suggestions would be Welcomed !!
If anyone on her has experience with a 71 ST please chime in.

Your best bet would be to source as much parts domestically as possible. Photos of each part will help to clarify what your dealing with. The flywheel you posted looks like a 3 speed flywheel. Take it off and show us the other side as well as the crankshaft taper. A picture of the stator plate will also help. I actually prefer the external condenser like on the ST90 since it doesnt involve soldering.
 

Beretta

Member
I checked for Stator voltage while cranking by hand with the Plug removed--It has A/C voltage and D/C Voltage.
Plug wire had voltage too, but if I ground the Plug ---Nothing --No Spark-- I'll check the Plug again while foot kicking at a faster speed- while I'm doing a Compression Check.
Yes it appears the Flywheel is Identical to my other 3 Spd's Not My H's---Looks like the stator coils show no evidence of being changed- But--Where is the neutral wire--there are only 3 wires to the Stator Plug
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allenp42

Well-Known Member
Your stator looks like a SL70 K0 due to the wrap on the lighting coil and because it does not have a condenser mounted on the plate. The condenser on this type is usually mounted on the ignition coil. On a CT70, the ignition coil is mounted under the fuel tank, and would assume the same for a ST but not sure. No spark is usually due to dirty/oxidized points or a bad condenser. I would try cleaning the points with electrical contact cleaner or brakeleen and maybe a few passes of 400 grit sandpaper. Definably clean/set the points before replacing the condenser.

Or if you're anxious to see some spark, replace both.
 

allenp42

Well-Known Member
I took a quick peek on CMSNL and the ST70 shows to use a 3-speed type of crankshaft and has a condenser on the stator plate. Just to satisfied my own curiosity, does the lobe on the flywheel show a rub line about the same width as the rub block on the points toward the very end of the lobe?

Again, no experience at all with ST70s but the fact that you have a neutral switch and no wiring...and that particular stator makes me go ummm. See if you can find a condenser mounted on the primary coil.
 

Beretta

Member
Thanks for the reply !
I've been researching this the last few days. Thus far I've found that the existing stator plate and
connector are not OE for this bike, I pulled the Harness and the Stator plug has 4 wires one of which is the neutral colored wire the same as my H's-Green with a Red tail. And Yes this is a 3spd auto Flywheel.

Good news is the Eng has 140lbs of Compression and no sign of ever being apart . So- I'm looking for a decent used 4 Speed Flywheel-Stator plate and coils with the correct plug- I think a 1971 H is what I need.
CMSNL is a great source for parts- Just a little pricey with Shipping across the pond.
The plan is to get it running and ridable - Completely disassemble -Clean and leave the Frame and original paint alone as is- Of course along with all new peripheral parts- Tires-cables-seat Ect Ect.
 

OLD CT

Well-Known Member
Time out! You should measure from the crank seal on the stator to the threaded ''end'' of the flywheel.. That will be one expensive mistake buying a H flywheel and stator setup. Me thinks that is a 3 speed crank in there! And the 4 speed stuff will not work if I am right! It actually looks like you have the wrong stator right now, sure looks like a 4 speed Hitachi stator on a 3 speed crank, as it sits Beretta.

You may only need a 3 speed Hitachi stator to get her running.
 

allenp42

Well-Known Member
You may only need a 3 speed Hitachi stator to get her running.

I agree with OLD CT, and I agree with you that it looks like you have a 3 speed crankshaft. If this is a fact, you don't need a 4 speed flywheel...and becuase it will not fit a 3 speed crank.

Unless you have a really odd duck that is not listed on CMSNL, I would be looking for a K1-76 stator (has neutral wire) or a nice K0 and just add the neutral wire to the stator.

Did you find a condenser at the ignition coil or scabbed on somewhere along the route of the black wire from the stator to the coil under the tank?
 

Beretta

Member
K--I'll hold off on the parts !
The PO wired in a condenser scabbed on the Blk wire from the plug to the Coil.
You know what the measurement should be for the Crank End. So the H's have a longer crank ?
 

OLD CT

Well-Known Member
Yes, the 4 spd is longer. I just measured 1 1/2 inch from the stator plate to the end of the snout on a 3 spd.
 

Tripod

Well-Known Member
Does the main harness for the body have four pins at the stator connection? Does your speedo have a neutral light?

The more pictures you can post the better information you will get.
 

Beretta

Member
K Boys here we go !
Shaft Depth just shy of 1 3/4 or 1.64 in see Pic.
Chassis Harness Stator Plug has 4 wires including the Neutral wire for the Light
The Speedo has 3 lights- Green- Neutral-Yellow- High beams- Speedo backLight. Do I have that Right ?

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OLD CT

Well-Known Member
O.K. you have the green light to order a 4 speed Hitachi flywheel. You have the 4 speed Hitachi stator. 4 speed cranks are aprox 1/4 inch longer. Better to check than be sorry later. ;)
 

Beretta

Member
So your saying that the existing Stator as shown is an H style, if so where does the Condenser Mount and where is the Neutral wire. This one seems different form my CT70 H's
 
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