Chinese GY6 Service Repair Motorbike Manuals

The GY6 engine designs have a four-stroke single-cylinder in a mostly horizontal positioning that is used on several small motorcycles or scooters made in China, Taiwan, and other southeast Asian countries. Believed initially to have been a Honda design, it has since become a standard technology. Kymco went on to manufacture Honda clones such as the Pulsar (CB125) as part of their range. But before you work on your GY6, double check to see if you have a Chinese GY6 service manual.

The GY6 single is forced air-cooled engine with a crossflow Hemi cylinder head and a chain-driven overhead camshaft. Fuel metering is by a single constant-velocity style sidedraft carburetor, typically a Keihin CVK clone or similar.

The ignition is by capacitor discharge ignition (CDI), with a magnetic trigger on the flywheel. Due to the fact, the trigger is on the flywheel instead of the camshaft; the ignition will fire on both exhaust strokes and the compression, making it a 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.

It included an integrated swingarm, which housed a centrifugally controlled CVT, which used a rubber belt occasionally called a VDP.  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 Bravo, Vespa Grande, and variated Ciao model, as well as Hobbit scooters/Honda Camino/mopeds. An electric starter, backup kick-starter, and rear brake hardware are also housed in the swingarm. However, if you ever find yourself showing your GY6 some TLC, make sure you have a Chinese GY6 repair manual to make sure the job gets done right.