Second hand advice Honda Dax ST 50-70

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Second-hand advice Honda Dax ST 50/70

Second-hand advice Honda Dax ST 50/70
Small escapes

The Honda Dax is sometimes faster than the police allow. In such situations, the small dimensions and light weight definitely pay off. The mini motorcycle from the 1970s is a classic today.

Gerfried Vogt

December 21, 1998

With the small four-stroke engine of the Dax, Honda blew up in 1970 to change the pace and attack screeching two-stroke fifties. With success. The ST 50 quickly caught on with the tuning-loving youth. The 4.5 hp moped, whose engine, including a smart semi-automatic and three-speed gearbox, is based on the engine of the Honda C 100 Super Cub – a four-stroke machine that Honda sold from 1958, but which never caught on in Germany, marches at around 70 kilometers per hour.
In contrast to the ST 50, which is just 1.5 meters long, in which Klacks Leverkus only complained about the undamped telescopic fork in the first test in MOTORRAD 24/1970. Even back then, he warned the offspring who were keen to experiment against tampering with the sporty raised exhaust: “The thing then rattles like an MG 42, but the engine doesn’t pull anything anymore.
In 1973 the ST 50 was replaced by the ST 50 G – a low-insurance Mokick version of the Dax with 2.1 hp. A good decision, as 35,000 Dax-Mokicks sold by 1978 impressively prove. The motorcycle version, the ST 70, which was only 50 marks more expensive, appeared together with the Mokick. The 72 cm³ model comes with indicators and high beam as additional equipment, but has the same weak six-volt alternator of the ST 50 G with a mere 41 watts Perfomance. The specified 75 km / h can only be achieved with difficulty by the “big one” with her 5.2 horses. Both versions remained in the Honda program until 1980, followed by an eight-year break.
In 1988 the Dax reappeared as a 50 km / h Mokick. To the delight of the fan base, it now has a significantly improved chassis, CDI ignition, twelve-volt electrical system and even the main stand that was missing in the first versions. Its small dimensions have remained – thanks to the foldable handlebar halves, the Dax fits easily into any mid-range car. In addition, with all STs, the fuel tank under the seat can be closed leak-proof with a twist of the tank lid.
The innovations on the 1988 model also include a number of changes that put a stop to the tuning attempts undesirable by the TuV and the police. For example, demolition bolts, a longer connecting rod and thinner walls put a stop to the subsequent search for performance. Insiders don’t mind – they simply spice up their Dax with high-quality Takegawa or Kitaco tuning parts from Japan. You can get it from Nikolaus Tams, phone 0511/9523355, or from the Dax and Monkey Tuning Team, phone 08641/698770. From individual components to drilled cylinders to complete engines, everything is available that delivers performance or eliminates weak points.
These few weak points in the series Dax include the plain bearing camshaft, which only ran in ball bearings from 1988, and the mechanical timing chain tensioner. A conversion of the cylinder head to needle bearings is possible from Heinrich Kohler, phone 04231/73733. There is also an improved timing chain tensioner for around 50 marks. Dax connoisseurs also swear by SAE 10W 50 when it comes to lubrication and advise against synthetic oils, as otherwise problems with the centrifugal clutch can occur.
If the used ST 50 or 70 has already stood more than 15,000 kilometers on the clock or for a few years, the new owner should free the oil strainer and centrifuge from accumulated abrasion. Contrary to the information in the maintenance manual, frequent drivers set the exhaust valve clearance less tightly (0.07 instead of the stated 0.05 millimeters). The remedy for the quick deflecting fork sleeves of the undamped telescopic fork up to 1980 is provided by precisely manufactured fitting sleeves from tuning specialist Walter Rein, phone 07021/58443. Georg Clemm, phone 0171/3280292, who, among other things, prepares emissions reports and makes TuV entries for conversions, can also help with particularly tricky questions about the Dax.
At the Federal Motor Transport Authority, almost 3000 ST 70s are in stock – these are models built up to 1980, because all ST 70s of the new series were imported in gray and approved for use as light motorcycles by individual acceptance. Interestingly, older ST 70s with motorcycle approval are often cheaper to get than their weak Mokick counterparts. There are almost only construction sites for less than 1,000 marks, everyday items with luck from around 1,500 marks, pieces of cream and conversions often cost more than twice as much.
The bad news at the end: According to Honda Germany, the production of the Dax ST 50 has now also been discontinued in Japan, although a Japanese website on the Internet lists a 1998 special model with four-speed gearbox, manual clutch and additional electric starter.
It’s a shame, because even after almost thirty years, the cute, little four-stroke engine has lost none of its charm, which countless DAX fans still succumb to.

Technical data – Honda ST 50, type AB 22 from year of construction 1988

Strengthen

Low-maintenance, simply constructed engine

Low seat height

Smart semi-automatic

weaknesses

Short range

Oil filtering only by centrifuge

Lax chassis

Technical data engine Air-cooled single-cylinder four-stroke engine, one overhead camshaft, two valves operated by rocker arms, wet sump lubrication, Keihin PW 12 slide carburetor, passage 12 mm, alternator, battery 12 V / 3Ah, kick starter. Displacement 49 cm3, nominal output 2.4 PS ( 1.8 kW) at 7000 rpm power transmission Primary drive via gear wheels, centrifugal clutch, three-speed gearbox, secondary drive via chain. Chassis Pressed steel frame, hydraulic telescopic fork, standpipe diameter 25 mm, two spring struts at the rear, drum brakes front and rear, diameter 110 mm, divisible steel rims. Dimensions and weightsSpring travel front / rear 93/68 mmSpring head angle 65 degreesLength 1510 mmSeat height 740 mmTank capacity / reserve 2.5 / 0 , 5 liters Weight fully fueled 75 kg Perm. Total weight 255 kgSpare part pricesComplete partsBrake lever 8 marksHandlebar half with holder 58 MarkBlacker front 99 MarkFork tube 55 MarkFront wheel complete 253 MarkMuffler complete 137 MarkTank, painted 136 MarkFrame complete 610 MarkShock absorber 137 Mark 1970 Ratgeber 20/1980 Driving report 14/1988Tire releasesFront and rear 3.50-10No brand loyalty Honda ST 50/70 DaxModel maintenance 1970 ST 50: Camshaft and cylinder head of the SS 50; 4.5 hp; leak-proof 2.5 liter tank; undamped telescopic fork; Light switch on lamp holder; Contact-controlled ignition without ignition adjustment 1973ST 50 G: Mokick version with 2.1 HP throttled via ignition adjustment; Reduced inlet and outlet, modified magneto pole wheel. ST 70 E: motorcycle version with 47 mm bore; 5.2 hp; Light switch in plastic lamp housing; Flasher system1977K3 model series with slight design changes1978Last import year of the K3 series1988Dax revised according to the anti-manipulation catalog: new, hydraulically damped telescopic fork; Connecting rod extended by 3 mm; Throttling through welded metal sheets in the exhaust; Camshaft in the head now with ball bearings instead of slide bearings; easier shifting due to new shift drum; CDI ignition 1998 Only in Japan: Special model with four-speed gearbox and electric starter

Reading experiences

The tenor of the readers is clear: The Dax is a bike that is fully suitable for everyday use and a great fun mobile for the whole family.

In spring 1997 I bought a 70 Dax, built in 1979, with only 8500 kilometers. When the odometer reading was 11000, the clutch, which had been worn out due to late upshifts, was due. With the recommended Metzeler ME1, the Dax is much more stable in curves than the Bridgestone TW 3. The Dax is a »mopped ?? for learning to drive and screw, the 70s version, unlike the 50s, is not underpowered and is a lot of fun as a city runabout and as a scooter fright. Tim Olfenius, Kirchheim / Teck As a teenager I was fascinated by the idiosyncratic, beautiful styling, the sonorous sounding four-stroke engine, the scrambler exhaust, the studded tires and the wide double seat on the Dax. Although often smiled at because of the small dimensions, I am still enthusiastic about the charm of this mini bike. The 70s runs a good 70 km / h. In my opinion enough, because the chassis and brakes would be overwhelmed at speeds over 80 km / h anyway. The reliability is quite good with appropriate maintenance, but the valves and ignition have to be readjusted more often.Reinhold Bohm, Schongau I now have my fifth Dax. After several ST 70s, in the early summer of this year I bought a 1993 ST 50 with a odometer reading of 2300 as a basis for tuning measures (the 97 cm³ engine has already been ordered). The 70s Dax bring pure driving pleasure, the 50s are rather weak on the chest with their 2.4 hp. The only real drawback of the Dax is the much too small tank. Prospective buyers should make absolutely sure that they do not have a tinkered copy from the »tuning specialist ?? Udo Stenzel, Lichtenau The lot has decided among all the letters: Mr. Kitschmann-Storig from Barsighausen will receive the 100 marks

Readers’ appeal: MOTORRAD is looking for experience

MOTORRAD is looking for experience

Reading experiences are an important source of information for buying a used vehicle in MOTORRAD. So if you have something to report about damage, tire tips and accessories on one of the motorcycles listed below, please write to: MOTORRAD editorial team, keyword used purchase, Postfach, 70162 Stuttgart. Don’t forget to enclose a photo of yourself and your machine. Attention new! How satisfied are you or were you with your motorcycle? Give us your personal satisfaction factor in the form of a school grade between one (very good) and six (unsatisfactory) – including comma values. MOTORRAD is raffling off a MOTORRAD chronograph worth 120 marks among all senders.

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