The Batavus HS-50 has motorcycle styling with the tank positioned between the knees built to a Harglo specification for the British market. The Batavus HS-50 comes in the color red while its twin, the Mobat, is black sporting a stylized “MoBat” logo in black and gold on a silver field adorning the fuel tank.
Like the other Batavus model, the HS-50 uses the 48cc Laura Engine.
Original air filters are extremely hard to find, but uni-pod makes a universal filter that works better, model # UP 4200. The filter fits right over the carb throat and tightens down with a hose clamp. This will provide better pickup and possibly more speed. These filters can be ordered online.
The HS-50 has single-speed transmission with automatic clutch and can reach a top speed of 35mph. Due to the nature of the centrifugal clutch/chain drive to rear wheel, initial acceleration is very poor and renders the machine very unstable for the first few yards. However, once the bike is under way, the rate of acceleration increases. In fact, after a few seconds when the engine reaches its power band, the 90lb machine accelerates forward and starts making up ground on geared mopeds that have no trouble in beating it away from a standstill.
Worn belts can slip and twist, causing poor acceleration and other headaches. Replace the M48's belt at the first sign of dry rot, cracking, or breakage. Find a replacement belt by taking your old belt in to your local automotive or tractor supply store or by referring to any of the following model numbers: Gates 9319, Dayco 17320, Goodyear 17321, metric # 13A0815.
Front suspension of the HS-50 is by telescopic forks with internal springs, while the rear is by a pivoting fork with the engine on the forward end to counterbalance the rear wheel. The handling of the machine demands a great deal of care, as the steering is very light possibly because the forks are mounted too near the vertical plane. This is all very well when maneuvering through traffic but, when traveling at more than a walking pace, the bike can feel unstable or twitchy. Despite using thin bicycle-type tires, the HS50 corners well allowing even the novice rider to lean the machine over to somewhat extreme angles. The only thing one has to remember is to turn the pedals so that they do not scrape the ground.
Due to the light weight of the HS-50, the small drum brakes are quite efficient; in fact, it is quite easy to lock both wheels on the driest of roads with just a firm grip on the handlebar-mounted levers. When the HS-50 winds itself up to a fair speed, it is affected by gusty side winds, and much concentration is needed to keep traveling in a straight line. Also, the bike is prone to bounce around on bumpy surfaces and, again, needs to be held fairly tight.
The HS-50 uses a Bosch generator for its 6V electrical system and requires no battery for its magneto ignition. The magneto powers a small headlight and indicators are an optional extra. Here is a copy of the wiring diagram .
1 1/2 gals (5 liters) petrol with reserver tap.