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Siba and Bosch Black Box Systems

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The picture shows a SIBA black box control system fitted to all KR200 models up to chassis number 70643 reported date of introduction 6th April 1959. Never remove the regulator cover with the battery connected. Accidental closing of the cut-out contacts often causes them to weld together. The engine starter will appear to be operating … Read more
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Engine Technical Data Sachs 200 type AZL-R For Messerschmitt KR200

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Type Air-cooled single cylinder two stroke engine Transfer port type Schnuerle loop scavenging Cylinder bore dia. 65mm Piston stroke 58mm Cylinder volume 191cc Compression ratio 6,3 : 1 Power output 9,7 hp at 5250 rpm Gearbox Four speed integrated gearbox Clutch Four plate oil bath clutch Neutral selector Hand operated lever and cable Starter system … Read more
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Engine Technical Data Sachs 200 type AZL

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Type Air-cooled single cylinder two stroke engine Transfer port type Schnuerle loop scavenging Cylinder bore dia. 65mm Piston stroke 58mm Cylinder volume 191cc Compression ratio 6,3 : 1 Power output 9,7 hp at 5250 rpm Gearbox Four speed integrated gearbox Clutch Four plate oil bath clutch Neutral selector Hand operated lever and cable Starter system … Read more
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Silicone use and Applications

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The article by Anders Johnsson the Engineer from Sweden, on “Silicone – Carbon Brush Poison !” featured in the July 2001 Edition of Kabinews was excellent in it’s content and the problems that it highlighted. Having shown the article to a number of people, it created quite a lot of interest, especially among my well … Read more
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KR200 Electrical System Overview

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When the engine is stopped and the ignition switch turned on, the battery supplies power to all circuits. 1. START Turning on the start switch energizes the start relay. Heavy duty contacts of this relay will supply high current to the stator coils, which are in series with the rotor by way of, HE of … Read more
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TG500 Model History

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The Tg 500: After the KR200 model variants were introduced, tests on the first four wheeled KaRo- the “Tiger” began in September 1957. The sales were aimed at existing KR 200 owners who had developed a faithful following in Germany with the many Karo Clubs. For legal reasons, the “Tiger” could only be called the … Read more
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TG500 Engine Development History

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Fend started negotiations with Fichtel & Sachs to buy the rights to produce an engine developed by them for the burgeoning small car market in Germany. It is thought they had originally designed this engine type during the war as a starter motor for large aircraft engines. An existing drawing dated 16th December 1955 that … Read more
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History of the high performance TG500

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Launched in May 1958 to great acclaim from Messerschmitt fans in Britain, who were impatient for its arrival. Four months later, it reached us and we were not disappointed. Our Club welcomed Herr and Frau Fend for the first time for the official British launch of the Tiger on 29th September that year at Brands … Read more
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Overhauling Rear Drive

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These notes cover all rear drives after chassis number 65186, but the procedures for the overhaul are similar. Before starting this job, do some diagnostic work to determine the extent of repairs and replacement parts needed. Jack up the car and make it secure and remove the wheel and brake drum to reveal the brake … Read more
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Shifting and gearbox problems

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First of all you should realize that the way the Sachs engine is designed, it is impossible to have shifting or jumping-out-of-gear problems. But, since this appears to be happening to many club members, we should look at the possible causes: Jumping out of gear can be caused by 4 different conditions: Improper shifting Neutral … Read more
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Understanding Gearbox Ratios

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All gears can have different ratios in a SACHS engine. By following these instructions you will be able to find out what ratios are in the gearbox without taking it apart: Select first gear, and then turn the crankshaft 31 revolutions. Take out the plug will make it a bit easier. If the mainshaft turns 4 revolutions you … Read more
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Barrels

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Originally, the SACHS 200 engine had 10,2 HP and for Messerschmitts it was later reduced to 9.7HP. The reason for this change was that at 10.2HP it was in a higher insurance category in Germanyand thus raised the cost of insurance for everyone with a car above 10HP. You can differentiate the weaker barrels as … Read more
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Measuring pistons and re-boring clearances

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Two-stroke engine pistons often run hotter than similar capacity four-strokes because the working strokes are doubled. Exposure of the exhaust ports and contact with hot eases leads to further increases. The heat expansion is therefore greater than with the four-stroke-engine. Greater assembly tolerances are required for pistons. gudgeon pins and piston-rings. to compensate for the … Read more
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Messerschmitt Owners' Club