Several months ago I let the fuel in the tank run low & had to turn the fuel cock into the reserve position. As luck would have it debris was sucked into the carby and the engine started running rough & finally stopped working 90km from home. After some assistance from a motorcycle shop and further running repairs, as I carry a comprehensive tool kit, I was able to encourage the Sachs to limp home. Over the next couple of months I stripped & cleaned the carby several times until I finally found the source of the problem which was a dirty fuel bowl inlet valve. Now after a few extra tuning steps the Sachs is running better than ever. To try to ensure that this problem does not occur again, besides not running with an almost empty fuel tank, I have installed an in-line fuel filter in the fuel line just after the fuel tap. You may wish to consider the same modification. In-line fuel filters are obtainable from Ebay. If you are not familiar with working on engines you may wish to leave the mod to a mechanic. Leaking fuel is best avoided. For those of a mechanical bent, below is a description of the best technique I have found for quickly accessing the carby for cleaning. This technique works for me as I have made several mods to the configuration of my Sachs. First I have removed all plastic fairings & the skirt at the bottom of the fuel tank. This makes the bike easier to work on. Second I have relocated the VIN compliance plate from near the carby to the rear bike frame just under the seat. This makes more room for accessing the carby. The technique below may not fully work if the above mods have not been made. Make sure the engine is fully cold before starting Turn off the fuel tap Remove the seat Disconnect the fuel line from the fuel tap. Use a rag to stop any fuel from spilling Disconnect the fuel gauge wire plug under the fuel tank Remove the fuel tank Loosen the clamp that attaches the air cleaner box to the carby Remove the 2 air cleaner box holding bolts at the top of the box Jiggle (is that a technical term?) the air cleaner box until the air cleaner box frees itself from the carby Undo the 2 nuts attaching the carby to the engine Jiggle (their we go again) the carby until you can move it outside the bike frame. It is a tight fit & you might not be able to do this if you have not made the bike mods I described above Remove the cable operating the carby fuel pump. This is harder than it sounds Unscrew the carby slide cap & withdraw the slide Now the carby body is free from the bike. Reinstall in the reverse order. There is lots of info on the Internet re cleaning carbys. Whilst researching a solution to my problem on the Internet, I came a across a reference which stated that engines similar to the Sachs with lots of bits attached to reduce pollution often have the carby set to run a lean fuel/air mixture. So after I had the engine working again, I gave the engine fuel/air mixture a small tweak. The low speed mixture screw is located on the right hand side of the carby at the front bottom edge of the fuel bowl. It is the screw in a vertical orientation that screws up into the front of the fuel bowl. I had to find a small screw driver & cut off most of its handle to get an implement with which I could easily adjust that screw. With the engine at full working temperature, I first adjusted the engine revs to about 1750rpm (details on page 11 of the user manual that came with the bike) and then unscrewed the fuel mixture screw a quarter turn at a time until the engine started running rough & then turned the screw back in 2 quarter turns or so until the engine ran smoothly again. I went through those 2 steps above until the engine was running smoothly & then turned the idle revs down to 1500rpm. I now find that starting a hot engine is much easier. Over time you may wish to keep an eye on the spark plug to ensure that it does not soot up indicating a too rich fuel mixture. But at the end of the day a slightly rich fuel mixture is better for the engine than a slightly lean fuel mixture. So to finish. Don't run out of fuel as I did & you may wish to consider installing an in-line fuel filter. Safe riding to all.