Garelli
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Garelli is an Italian manufacturer of mopeds. Garelli produced such model as the Super Sport XL, VIP, Eureka Flex, and Gran Sport.
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Rubber Clutch
The rubber clutch in Garellis is often the source of problems, especially concerning idling issues. One common problem with the clutch is the melting of the rubber bushings inside the clutch, which can be fixed by removing the melted parts and replacing the bushing with rubber fuel line.
Horizontal Engine
The Horizontal or NOI style engine came on, to name a few, the Sport, NOI, and Supersport XL lines. It has a single speed automatic transmission with an internal reduction of 16/71 or 1:0.225. The internal pedal ratio is 27/9 or 1:3. The Supersport XL LTD 2 Speed came equipped with a VIP style two speed transmission, though it is exceptionally rare.
Garelli sold bikes with NOI style engines with 17, 20, 25, and 30mph top speed ratings. These different speeds were accomplished through a variety of means, including cylinder port area, head design, intake variance, various carbs and jettings, gearing, spark plug type, exhaust header diameter and shape, muffler restriction, and piston crown shape.
The cylinder generally seen on a NOI style engine is the rectangular cast iron. These, like most Garelli jugs came in two varieties. The 'Red Dot' fast cylinder and the 'Yellow Dot' slow cylinder, with matching intakes. The Porting difference is small, though the intakes are very different. The 'Yellow Dot' or 'Square Guy' intake bends on a 45 while the 'Red Dot' or 'Curvey Guy' intake curves up without any sharp bends. These dots can be found by looking at the top of the intake flange, looking down so as to see through the bore. They can also be found on the underside of the flange on the intake itself. They are not always present as they were only painted on and can wear off.
Garelli also fielded an Aluminum version of their rectangular cylinder, as well as a noticeably different ported radial cylinder with accompanying radial head. There is also a flat top and bottom Aluminum type with more fins that does not fit with the general style of the above mentioned. While nearly all other Garelli cylinders seem to be stamped 'CH-3.0', this last type is stamped 'CH-1.2'. [Anybody know what these CH's mean?]
Piston crowns can either be flat, yielding lower compression, or domed giving higher.
Most NOI style engines came with a Dell'Orto SHA 14/12, though a few came with a SHA 14/9.
The Garelli Katia came with a slightly scaled down version of the NOI. While all parts are the same in proportion, the scale is such that very little is interchangeable.
Care and Maintenance
Regardless of engine type, Garelli's require 13.5oz of SAE 30 motor oil in their transmission.
If your Garelli came with the Oil Injector Pump, it is advisable that you either test it periodically or remove it entirely and pre-mix. The seals in these pumps can fail with age, causing vacuum leaks that reduce the actual amount of oil making it into the gas tank. Running to lean on oil can lead to seizure of your engine.
Manuals and Specifications
See this link for the Garelli '76-'78 Owner Service Manual
Garelli horizontal engine specs
See Also
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