Common questions on Chinese Engines. Where to look for the model?
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European bikes are more difficult you have to look up the supplier say (Aprilia) then check the engine in production (say SR 50 was it Ditech, Piaggio, PureJet, Minarelli) so for OEM Derbi it could be (Derbi, Piaggio etc...) on these higher end brands from Taiwan or Europe you must check with the OEM. For generic Chinese its easy, you can check the engine numbers at the bottom of your bike. So for Peugeot, Malaguti, Kymco, CPI, European made Benelli, Aprilia, Piaggio, Vespa, Derbi, Italjet you will need to check online or with the OEM for the engine in each mode. This is very important if working on an Aprilia for the first time since most dealers dont know what engine version is in the scooter. Same applies to Derbi it can be difficult since some have LC version made by Piaggio and others the LC made by Derbi. Double check.
Generic Chinese engines tend to be easier because there is a stamp on the side of the engine case.
For Chinese Common Engines
50cc 2-stroke D1E41QMB02, D1E41QMB, H1E41QMB and 1E41QMB model engines
250cc 4-stroke CN250 water-cooled 172mm
Linhai 260 - Sunright / Diamo / PSF
All Generic Type Air Engines 150cc and 125cc GY6 QMI152/157 QMJ152/157 4-stroke
All Generic Type Air Engines for 50cc 2-stroke 1PE40QMB Minarelli based engine.
The factories use different pre fixes say QJ for Qjiangjiang or QMA, ZMD will be Zongshen. The first number is the number of cylinders, the second, a P, is code for a horizontal engine. THIS IS NOT ALWAYS IN THE SAME PLACE. Check above the engine, next to the seat. Some brands have the number plate on the upper rear side of the belt cover. GY6 engines are on the fron, bottom, left had side near the centerstand pivot.
The cylinder or engine numbers are also located in the description itself. The next 2 numbers, 39, is the bore diameter in mm, 39mm bore. The next letter, F, indicates that it is natural (not forced) air-cooled style. The next letter designates that it is a motorcycle engine "M". The next letter reveals the full engine displacement. B is code for a 50. C for a 60, D for a 70, F for a 90, G for a 100, H for a 110, I for a 125, J for a 150, and so forth.
QMA139 or QMB139 would be the standard GY6 50cc.
140EQMB is the standard JOG copy of the Minarelli Yamaha Air Cooled engine but with a 12mm pin for anything made in China or Taiwan after 2005.
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MRP sells Performance engine parts and scooter tuning accessories from Stage6, SSP, Motoforce, STR8, Malossi, Polini, Hebo, Naraku, Top Performances, Arreche and others. Racing cylinder kits, exhaust systems, clutches, variators, carburetors, drive belts optic tuning accessories and more.
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