![puch moped engine puch moped engine](https://img.ricardostatic.ch/t_1000x750/pl/1190213380/14/1/puch-maxi-s-rahmen-gabel-und-motor.jpg)
As such, the debate continues as to whether these were in fact stock pistons or not. It has not yet been determined whether these came from the factory, or were aftermarket or repair parts added after the production of the moped. Another variation is a two-ring piston with a dykes ring, or L-profile piston ring with the dykes ring closer to the crown. One variation is a single-ring piston, with the ring located much closer to the piston crown than on the standard two-ring Puch piston. However, some have found other types of pistons in stock Puch cylinders. Typically, all of the Puch cylinders ran a two-ring piston with thick piston rings. Stock pistons are still a realm of debate. There is also a "high compression" cylinder head which is slightly lower than the standard cylinder head, and thus raises compression. There is a standard cylinder head, which has a large squish band and can be milled down for higher compression. Two styles of stock cylinder heads can be found on the E50 and ZA50 engines.
![puch moped engine puch moped engine](https://img.ricardostatic.ch/t_1000x750/pl/1131380028/0/1/puch-maxi-e50-motor.jpg)
This cylinder/top end is highly sought-after by many performance tuners, because even without modification, it can perform better than some kits. The cylinder that came on this moped is aluminum, has a good squish band, came with large bridged transfers and a boost port, a single dykes ring piston, and an angled exhaust port. In the 1990's, Puch (then owned by Piaggio) manufactured the Korado. They also featured an angled exhaust port, which is different than the flat exhaust ports on the aluminum and cast-iron series. Like the "hi-torque" series, they had cast-iron cylinder sleeves. These cylinders have physically larger outer dimensions, but they retain the same 49cc displacement as the other stock Puch cylinders.
Puch moped engine series#
The last series of stock cylinders manufactured for the E50 and ZA50 was the Magnum series. However, the stock Puch intake manifolds and carburetors only came in 12mm and 14mm sizes, which do not take advantage of this large intake port. Some of these cylinders also came with very large intake ports where they connect to the intake manifold. These cylinders are typically stamped with single digit designations like 1, 2, 3, etc. There were the aluminum series cylinders, which have completely open transfer ports and are completely aluminum, with the exception of a plated bore. Main article: Puch cylinders (aluminum series)
Puch moped engine manual#
Click here to see a page from the Puch manual explaining the differences between the stock Puch top ends (aluminum series 1-5 and high torque series 11-33).
![puch moped engine puch moped engine](https://img.ricardostatic.ch/t_1000x750/pl/1123206510/0/1/puch-maxi-motor-e50a-mofa-lauft.jpg)
Many stock cylinders were manufactured for the E50 (and the ZA50 as well, as stock cylinders are compatible with both engines). These refer to the cylinder/ piston/ cylinder head assembly and the crankcase, respectively. At the most broad level, there is the top end and bottom end.