8/13/2019 Gy6 50cc Engine Spec
The open-source GY6 design has been adopted and tweaked by many scooter and light vehicle manufacturers (ATV etc.) across Taiwan, PRC and South East Asia. The exact origins of the design are unknown, and while it is often claimed to be a Honda design, no Honda products have ever been produced with a design resembling that of the GY6. The design is free to use by any manufacturer, and parts are intended to be freely interchangeable from one manufacturer to any other.
The Honda GY6 Engine is a small four-stroke internal combustion engine developed by the Honda Motor Company. The GY6 is commonly used to power various kinds of small vehicles, including Buggies, ATVs and Scooters. Amazon.com: 150cc gy6 engine. Brand New GY6 50cc 4-Stroke Short Case Engine 1P39QMB CVT QMB139 Scooter Peace Jonway Moped. $349.99 $ 349. FREE Shipping. Only 5 left in stock - order soon. TC-Motor Engine Mount Bushing For GY6 125cc 150cc 4 Stroke 157QMJ Scooter Moped ATV Quad Go Kart Cart.
The GY6 series is normally built in 125cc to 170cc versions. A smaller version identified as 'QMB' engines is produced widely in 49cc to 100cc models. Kymco QMB engines are designated 'SD10' and Kymco GY6 engines are designated 'SD20'. There are many other model numbers by different manufacturers but, in general, most parts are interchangeable within a series since the entire design in China is not copyrighted nor trademarked. It is an 'open-source' engine family.
The 150cc GY6 examples are popular alternatives to 50cc Honda Ruckus owners as candidates for engine swaps since the engines are (a) more powerful and (b) open source so parts are widely available.
Configuration[edit]
The GY6 and QMB designs are a single-cylinder, four-stroke engine, in a near horizontal orientation. It is forced-air cooled, with a chain-driven overhead camshaft and a crossflow hemi head. Fuel metering is by a single constant-velocity style sidedraft carburetor,[1] typically a Keihin CVK clone or similar.
Ignition is by CDI, with a magnetic trigger on the flywheel. Because the trigger is on the flywheel instead of the cam, the ignition will fire on both the compression and exhaust strokes, known as 'wasted spark' ignition'. An integrated magneto provides 50 V AC power for the CDI system and 20-30 V AC rectified and regulated to 12 V DC for chassis accessories (such as lighting), and to charge a battery.[1]
It includes an integrated swingarm, which houses a centrifugally controlled Continuously variable transmission (CVT) using a rubber belt sometimes called a VDP. At the rear of the swingarm, a centrifugal clutch connects the transmission to a simple integral gear-reduction unit. There is no clutch of any kind between the CVT and the crankshaft; it is engaged via a centrifugal clutch at the rear pulley in the same fashion as Vespa Grande, Bravo and variated Ciao model, as well as Honda Camino/Hobbitscooters/mopeds. An electric starter, backup kick-starter, and rear brake hardware is also housed in the swingarm.[1] There are variants known as the 'short case' (10' rear wheel, 729, 735 or 742mm belt) and 'long case' (12' or 13' wheel, 835 or 842mm belt). Final gearing ratio can be as low as 13/40, or as high as 18/36 (more commonly available as aftermarket items).
Variants[edit]
Specifications of GY6 variants[2][3]
The GY6 engines are produced by many different manufacturers in Asia such as Baotian, Yingyue, Linhai, Lifan, Loncin, Zongshen, Jialing, Jianshe, Qianjiang, Haojin, Shineray, Bashan, Jonway, Kymco, SYM, and Znen. Most retain 'GY6' labelling for their engines, but Kymco uses the 'SD10/20' identifier since it's based in Taiwan, but it's using an open-source Chinese design. There are some minor surface detail differences between the engines which slightly reduces parts interchangebility between different GY6 engines, but parts can be interchanged regardless of superficial differences. The different types of GY6 engines are recalled as GY6-a, GY6-b, GY6-c. Karts, quads and buggies often features a reverse gear in the engine case.
References[edit]
Further reading[edit]
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Retrieved from 'https://en.wikipedia.org/w/index.php?title=GY6_engine&oldid=901229993'
The GY6 series is normally built in 125cc to 170cc versions. A smaller version identified as 'QMB' engines is produced widely in 49cc to 100cc models. Kymco QMB engines are designated 'SD10' and Kymco GY6 engines are designated 'SD20'. There are many other model numbers by different manufacturers but, in general, most parts are interchangeable within a series since the entire design in China is not copyrighted nor trademarked. It is an 'open-source' engine family.
The 150cc GY6 examples are popular alternatives to 50cc Honda Ruckus owners as candidates for engine swaps since the engines are (a) more powerful and (b) open source so parts are widely available.
Configuration[edit]
The GY6 and QMB designs are a single-cylinder, four-stroke engine, in a near horizontal orientation. It is forced-air cooled, with a chain-driven overhead camshaft and a crossflow hemi head. Fuel metering is by a single constant-velocity style sidedraft carburetor,[1] typically a Keihin CVK clone or similar.
Ignition is by CDI, with a magnetic trigger on the flywheel. Because the trigger is on the flywheel instead of the cam, the ignition will fire on both the compression and exhaust strokes, known as 'wasted spark' ignition'. An integrated magneto provides 50 V AC power for the CDI system and 20-30 V AC rectified and regulated to 12 V DC for chassis accessories (such as lighting), and to charge a battery.[1]
It includes an integrated swingarm, which houses a centrifugally controlled Continuously variable transmission (CVT) using a rubber belt sometimes called a VDP. At the rear of the swingarm, a centrifugal clutch connects the transmission to a simple integral gear-reduction unit. There is no clutch of any kind between the CVT and the crankshaft; it is engaged via a centrifugal clutch at the rear pulley in the same fashion as Vespa Grande, Bravo and variated Ciao model, as well as Honda Camino/Hobbitscooters/mopeds. An electric starter, backup kick-starter, and rear brake hardware is also housed in the swingarm.[1] There are variants known as the 'short case' (10' rear wheel, 729, 735 or 742mm belt) and 'long case' (12' or 13' wheel, 835 or 842mm belt). Final gearing ratio can be as low as 13/40, or as high as 18/36 (more commonly available as aftermarket items).
Variants[edit]
Specifications of GY6 variants[2][3]
The GY6 engines are produced by many different manufacturers in Asia such as Baotian, Yingyue, Linhai, Lifan, Loncin, Zongshen, Jialing, Jianshe, Qianjiang, Haojin, Shineray, Bashan, Jonway, Kymco, SYM, and Znen. Most retain 'GY6' labelling for their engines, but Kymco uses the 'SD10/20' identifier since it's based in Taiwan, but it's using an open-source Chinese design. There are some minor surface detail differences between the engines which slightly reduces parts interchangebility between different GY6 engines, but parts can be interchanged regardless of superficial differences. The different types of GY6 engines are recalled as GY6-a, GY6-b, GY6-c. Karts, quads and buggies often features a reverse gear in the engine case.
References[edit]
Further reading[edit]
![]()
Retrieved from 'https://en.wikipedia.org/w/index.php?title=GY6_engine&oldid=901229993'
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