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Engine has no power

Motor trekt niet.
Sparta-with does not pull

Bought a new (second hand) Sparta bike and it turned out not to pull. Replace all external parts: the carburetor, ignition, ignition coil and the spark plug. Nothing helped. The compression was also measured and it turned out to be fine. Then split the complete engine. Then the "evil" came up. The inner oil seal on the crankshaft was out of place. This also used up the oil from the gearbox. The engine turned out to have no oil in the gearbox at all. Installed new oil seals, mounted the engine, and topped up the oil. The engine now pulls fine again

Trekt niet checklist

Motor heeft geen trekkracht.

Various solutions possible:
•Diaphragm plate does not close............> Replace
•Exhaust clogged by oil or grease.......> Blow through or replace Mixing ratio one to 100
•Cylinder exhaust port caked.....> Clean
•Piston piston ring seized.......> Replace
•Deco valve remains open..........> Replace
•Crankshaft seal loose from its seat...> Replace. No longer possible for engines with 499 imprint.

Water drop







The water drop.
I noticed that every time after about 1000 to 1500 km my spartamet engine started to run rotten again. Then once again the carburetor blown through and the problem seemed to be temporarily solved.
By chance I discovered that liquid was trapped in the small mesh filter that was mounted on the sprayer. A water drop! Due to capillary action, water remains on the fine filter mesh. Gasoline passes through the smallest openings without difficulty, but water does not. If the water droplet is large enough, it will dance in front of the nozzle hole, as it were, impeding the passage of the petrol. In the end, the problem is easy to solve. Remove the gauze filter in the petrol tank, which can be pulled off with long pointed pliers through the filling opening of the petrol tap, if present. Remove the screen filter from the jet and fit a paper filter between the fuel tank and the carburetor. So absolutely do not use a gauze filter! When the paper filter is replaced every few thousand kilometers, the inexplicably rotten running of the engine will probably be a thing of the past.



Worn cables
Simple trading: Even a building on the cables was about a bout van de uitlaat passeren. This occurs because the coat on the plate slide, and here door water in the inner core can come from the wall door of the cable even further quickly slide. I've seen it happen in the cable before. It is simple to help. Veel succes.

Technical data

Engine specifications

Technical data motor Sachs 301/A 301/AB

Type one cylinder 2-stroke Otto engine
Cooling system Air cooling by driving wind
Cylinder capacity 30cm³
Bore Ø 33mm.
Stroke 36mm.
Compression 7.5
Power 0.5kW (0.7HP) at 3750/min.
Engine lubrication Two-stroke mixture, premium gasoline with synthetic two-stroke oil in

                                                the ratio 1:100
Drive by means of gears
Crankcase lubrication 70 cm³ resp. 90 cm³ Sachs transmission oil
Clutch Centrifugal clutch in crankshaft side
Ignition Electronic contactless magnet ignition (maintenance free)
Ignition timing 1.0 ± 0.2 mm.(17°) for b.d.p.
Space between ignition coil and flywheel 0.4 mm.
Spark plug BOSCH WR 10 FC or Champion RJI2YC
Electrode distance 0.5 mm.



BING single carburetor Ø8mm. with starter device and fuel tap BING no. 81/8/101 jet 42 -or- SACHS single carburetor Ø8mm. with starter device and fuel tap TK nozzle 48

Idle speed 2300...2500/min.
Air filter Paper filter in suction muffler
Starting system Manual starter with cable pull
E-start (battery and starter motor + manual start)



The fuel for the SPARTAMET.

The mixed lubrication for the SPARTAMET is easy to mix yourself. You use EURO 98 super petrol and synthetic two-stroke oil for this. Mixing ratio is 100 parts gasoline to 1 part oil. (1:100). This is not what is sold as a mixed lubricant at the petrol station. This mixing lubrication is mixed 1:50, so it is fatter. Mixing can be done in the tank or in a jerry can.

Mix in the tank. Put 1 liter of petrol in the tank and add 10 ml of oil. Shake bike a few times to mix.

Mix in the jerry can. Put 5 liters of petrol in the jerry can and add 50 ml of oil. Shake jerry can well. Pour mixture into the tank. Shake the jerry can well before each tank. Text from instruction booklet "SPARTAMET & RABBIT". The mixing ratio of the oil to the petrol depends on the extent to which you use your spartamet or rabbit. For intensive use, it is best to choose a rich mixing ratio of up to 1:50. (Possibly you can fill up with two-stroke mixed lubrication during a long ride if you have not taken any oil with you.) If you use the moped little or mainly for short rides (± 5 km.), then choose a poor mixing ratio of 1:100. In this way you prevent excessive pollution of the engine. With a poor mixing ratio, it is better to use leaded super gasoline (or with a lead substitute) instead of unleaded. This benefits the starting and driving performance of your light moped.

Bad start

Bad start. Put on 10x.....

This is often caused by the adjustment of the air gap of the coil in relation to the flywheel. This is then too big. Solution: adjust gap to 0.3mm. If you don't have a feeler gauge, it can also be done with 8 sheets of paper from the printer. Loosen the bobbin and put the 8 sheets between flywheel and bobbin. Clamp the spool against the flywheel and tighten it securely. Paper out and ready..... Attention!!! No smaller gap than 0.3mm because then the coil will run and then it will burn.

Measure blue coil

If there is no spark, the coil can be measured with an ohm meter. Disconnect all wiring from the CDI and the short circuit wire. The values to be measured are shown in the photo.

Measure black coil

If there is no spark, the coil can be measured with an ohm meter. Disconnect all wiring from the CDI and the short circuit wire. The values to be measured are shown in the photo.

Measure the red coil

If there is no spark, the coil can be measured with an ohm meter. Disconnect all wiring from the CDI and the short circuit wire. The values to be measured are shown in the photo.

Spark plug test

Standard CDI vs Turbo CDI