Puch cylinder kit summary

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This is a summary of all known Puch (Maxi) cylinders. This information is as-is and not guaranteed to be correct.

Puch 50cc Stock old model (38mm)

Stock Puch cylinder with open ports.

Cil1-resize.jpg Cil2-resize.jpg

Distinguishing marks:

  • Small, unconnected cooling fins
  • Open ports
  • Rectangular intake

Pros:

+ Reliable
+ Wear-proof

Cons:

- Discontinued

Description:

  • Aluminum with chromed wall
  • Intake port: oval
  • Ports: 2
  • Exhaust port: oval

Special points of interest:

  • Open ports.
  • 16mm carb fits without modifying.
  • Revs higher than the closed ports version.
  • Less torque than the closed ports version.


Puch 50cc Stock new model (38mm)

Stock Puch cylinder with closed ports.

Hi-torque -22, 2.JPG Hi-torque -22, 4.JPG

Distinguishing marks:

  • Bigger, connected cooling fins
  • Round intake

Pros:

+ Reliable

Cons:

- Discontinued

Description:

  • Cast-iron
  • Intake port: oval
  • Ports: 2
  • Exhaust port: oval

Special points of interest:

  • More torque than open ports version.
  • Revs less high than open ports version.

Airsal 50cc (as stock) (38mm)

Replacement cylinder for stock Puch cylinders. Has closed ports.

Cil3-resize.jpg Cil4-resize.jpg

Distinguishing marks:

  • Bigger cooling fins than stock cylinders with open ports.
  • In contrary to the fast 50cc Airsal, no logo.

Pros:

+ Reliable
+ Cheap

Cons:

- Rattles somewhat
- Poorly finished

Description:

  • Aluminum with nicasil wall
  • Intake port: oval
  • Ports: 2
  • Exhaust port: oval

Special points of interest:

  • Finishing the edges of the ports is recommended.


Zeta 50cc (fast) (38mm)

Cil5-resize.jpg Cil6-resize.jpg Cil7-resize.jpg

Pros:

+ Accelerates faster than stock Puch cylinders
+ Has a higher top speed than stock Puch cylinders
+/- Powerband comes higher than stock Puch cylinders
+ 7 Ports

Cons:

- Less bottom end power

Description:

  • Cast-iron
  • Intake port: oval
  • Ports (128º): 2
  • Exhaust port (159º): oval
  • Blowdown: 15.5

Special points of interest:

  • Nice cylinder to replace stock Puch cylinder.

Airsal 50cc (fast) (38mm)

Many say: Best fast 50cc.

Cil8-resize.jpg Cil9-resize.jpg Cil10-resize.jpg

Distinguishing marks:

  • Round logo on upper-left cooling fin
  • Cooling fins like the closed ports Puch cylinder, but not connected to each-other.

Pros:

+ Reliable

Cons:

- Sometimes poorly finished
- 4 ports

Description:

Special points of interest:

  • Good timing and most of the times the finish on the ports is good.


50cc TCCD / RGD (fast) (38mm)

Very fast 50cc.

Cil11-resize.jpg Cil12-resize.jpg

Pros:

+ Fast
+ 6 ports

Cons:

- Poor piston

Description:

  • Aluminum with nicasil wall
  • Intake port: oval
  • Ports (114º): 4
  • Exhaust port (164º): oval
  • Blowdown: 25


Metrakit 50cc (38mm)

Fast 50cc.

Cil13-resize.jpg

Distinguishing marks:

  • Big black cooling fins with unique shape
  • Cast-iron

Pros:

+ Fast

Cons:

- Expensive

Description:

  • Intake port: oval
  • Ports (?º): 4
  • Exhaust port (?º): oval
  • Blowdown: ?

Special points of interest:

  • Big intake that can handle an 18mm carb


Eurocilindro/Athena AJH 50cc (38mm)

VERY fast 50cc reed-valve kit

Cil14-resize.jpg Cil15-resize.jpg Cil16-resize.jpg

Distinguishing marks:

  • Big reed-valve intake

Pros:

+ Wear-proof
+ VERY fast
+ Reed-valve intake
+ Fits a big carb

Cons:

- Pistons are hard to get
- The valves has tendency to break, change to carbon valves asap.

Description:

  • Aluminum with chrome wall
  • Intake port (variable): Raised intake as booster-port
  • Ports (121º): 4 main ports + 1 booster-port (114º)
  • Exhaust port (175º): oval
  • Blowdown: 27
  • Click to view port map.

Special points of interest:

  • Reed-valve intake
  • Pulls hard and has high top speed.
  • Reaches 12,000 RPM unmodified.

Parmakit 50cc

50cc parmakit.jpg
50cc parmakit 2.jpg

Pros:

+ Largest transfers of any 50cc kit
+ Lots of torque
+ Reliable

Cons:

- Discontinued ( supposedly, there are a few out there still )

Description:

  • The front of the exhaust port is 32mm from the top of the cylinder 14.5mm x 27mm wide
  • The back of the intake port is 20mm from the back of the cylinder skirt 13mm x 25mm wide
  • Boost port in front of that is spaced 2mm forward of the intake port and is 18mm x 14m wide
  • All the side ports are 11mm x 13mm wide
  • Click to view port map.

Autisa 60cc (42mm)

Cil17-resize.jpg Cil18-resize.jpg Cil19-resize.jpg Cil20-resize.jpg

Description:

  • Aluminum with nicasil wall
  • Intake port (110º): Oval with half bar in the top
  • Ports (128º): 2
  • Exhaust port (158º): oval
  • Blowdown: 15

Special points of interest:

  • Pretty rare cylinder
  • Half bar in the intake.


Malossi 60cc (42mm)

Cil21-resize.jpg Cil22-resize.jpg Cil23-resize.jpg

Pros:

+ Pretty quick for a 60cc

Cons:

- Exhaust port is hard to modify

Description:

  • Aluminum with nicasil wall
  • Intake port (122º): oval
  • Ports (110º): 2
  • Exhaust port (159º): oval
  • Blowdown: 24,5
  • Boost ports (90º): 2
  • Diameter exhaust port: 25mm
  • Click to view port map

Special points of interest:

  • Piston-ring-gap goes between the exhaust port & intake port.
  • Piston also works in 60cc 42mm Eurocilindro kit for Puch.

Stock Hero Puch 65cc (43mm)

Stock cylinder found on Hero "turbo sport"

Hero puch kit.jpg Hero puch kit 2.jpg P8252244.JPG

Distinguishing marks:

  • Large cooling fins
  • Unique fin shape

Pros:

+ Rated at 4.5hp off the shelf
+ Massive transfer ports
+ 8 ports

Cons:

- Very poor quality casting
- Ports have very jagged chamfers that need to be cleaned up before cylinder can be run.

Description:

  • Cast-iron
  • Intake port (132º) rectangular
  • Ports (114º): 4
  • Exhaust port (144º): rectangular
  • Blowdown: 21
  • Boost ports (107º) 2
  • Click to view port map

Special points of interest:

  • Material needs to be added to cases to avoid air leaks.
  • Angled 3 bolt intake and angled exhaust


Metrakit 65cc (43,5mm)

Good torque cylinder. Pulls well at every RPM.

Cil24-resize.jpg Cil25-resize.jpg Cil26-resize.jpg

Distinguishing marks:

  • Black cooling fins
  • Last cooling fins have a sloped edge

Pros:

+ Very good pull from low RPM

Cons:

- 4 ports

Description:

Special points of interest:

  • Round intake that is large enough for a 20mm carb.

Airsal 65cc (44 mm)

Nice cylinder with pretty good pull and nice top speed.

Cil27-resize.jpg Cil28-resize.jpg Cil29-resize.jpg

Distinguishing marks:

  • Round logo on cooling fin

Pros:

+ Cheap
+ Reliable

Cons:

- Poorly finished
- 4 ports

Description:

  • Aluminum with nicasil wall
  • Intake port: oval
  • Ports (114º): 2
  • Exhaust port (164º): oval
  • Blowdown: 25

Special points of interest:

  • Finishing the edges of the ports is recommended.


Polini 65cc (43,5mm)

Fast reed-valve kit. Ideal for high top speed. Read this if you plan to run one... [1]

Cil30-resize.jpg Cil31-resize.jpg Cil32-resize.jpg Cil33-resize.jpg

Distinguishing marks:

  • Reed-valve intake
  • Unique intake

Pros:

+ 7 ports
+ Good finish
+ Reed-valve
+ VERY torquy

Cons:

- Expensive as hell
- Pistons are expensive too
- Needs very good carb tuning and oil-mixture

Description:

  • Aluminum with chrome wall (old models)
  • Aluminum with nicasil wall (new models)
  • Intake port (variable)
  • Transfer ports (114º): 4 ports + 3 boosters
  • Exhaust port (164º): oval
  • Blowdown: 25

Special points of interest:

  • Reed-valve intake
  • Rivals larger displacement cylinders in power
  • Very seize sensitive. Needs perfect mixture to run well.

Parmakit/Zeta/Autisa 70cc (45mm)

Discontinued

Cil34-resize.jpg Cil35-resize.jpg

Distinguishing marks:

  • Booster port that goes into the intake

Pros:

+ Reliable
+ Wear-proof

Cons:

- Discontinued
- 4 ports
- Intake is hard to modify, the booster port gets in your way
- Foot-gasket thickness comes very close. The booster port in the piston might be in front of the intake, so it doesn't run.

Description:

  • Cast-iron
  • Intake port: Square, U-shape
  • Ports (114º): 4
  • Exhaust port (164º): Oval
  • Blowdown: 25

Special points of interest:

  • Special boost port.

More info: http://mopedluau.blogspot.com/2014/10/finally-its-autisa-time.html

Airsal 70cc (45mm)

Very nice cylinder. A lot of people say: The perfectly timed cylinder.

Cil36-resize.jpg Cil37-resize.jpg Cil38-resize.jpg

Distinguishing marks:

  • Round logo on cooling fin

Pros:

+ Cheap
+ Reliable
+ Well timed

Cons:

- Rattles
- 4 ports
- Poorly finished

Description:

Special points of interest:

  • Finishing the edges of the ports is recommended.


RGD/TCCD 70cc (45mm)

Almost the same as Airsal 70cc. Some say that the old TCCD was made of better materials than the new RGD.

Cil39-resize.jpg Cil40-resize.jpg Cil41-resize.jpg

Pros:

+ Cheap
+ Well timed
+ 6 ports

Description:

  • Aluminum with nicasil wall
  • Intake port (127º): oval
  • Ports (121º): 4
  • Exhaust port (164º): oval
  • Blowdown: 21,5
  • Boost ports (114º): 2
  • Click to view port map


K-Star 70cc (45mm)

Good cylinder with good torque. Can be very fast with modifying.

Cil42-resize.jpg

Distinguishing marks:

  • Dark grey cooling fins
  • K-Star logo on cooling fin (Upside down when installed. Morons. :P Fixed on newer kits.)

Pros:

+ Cheap
+ 6 ports

Cons:

- Poorly finished

Description:

Special points of interest:

  • Good tuning material
  • Good piston & rings
  • Some pistons have their ring gap at 12:00, can cause expansion into windows
  • Guide to making it faster - K-Star 70cc Kit Compendium
  • DMP 70cc kits are almost identical, but they are inconsistently finished (better OR worse) and cast with less quality

Polini 70cc (45mm)

Very fast 70cc cylinder. Sadly discontinued.

Cil43-resize.jpg Cil44-resize.jpg Cil45-resize.jpg Cil46-resize.jpg

Distinguishing marks:

  • Special port-shape

Pros:

+ VERY fast
+ 6 ports

Cons:

  • - Discontinued

Description:

  • Aluminum with chrome wall
  • Intake port: oval
  • Ports (105º): 4
  • Exhaust port (175º): oval
  • Blowdown: 35
  • Boost ports: 2
  • Click to view port map

Special points of interest:

  • Good quality chrome wall
  • Discontinued


Eurocilindro/Athena 70cc (45mm)

Fast 70cc.

Cil47-resize.jpg Cil48-resize.jpg

Distinguishing marks:

  • Eurocilindro on bottom cooling fin (Only on Eurocilindro, not Athena)

Pros:

+ Wear-proof
+ Good torque

Cons:

- Pretty expensive

Description:

  • Aluminum with nicasil wall
  • Intake port (140º): oval
  • Ports (105º): 4
  • Exhaust port (160º): oval
  • Blowdown: 27.5
  • Boost ports (90º): 2

Special points of interest:

  • Better piston than in the reed-valve kit.


Eurocilindro/Athena 70cc (45mm)

Fast 70cc reed-valve kit.

Cil49-resize.jpg Cil50-resize.jpg Cil51-resize.jpg Cil52-resize.jpg

Distinguishing marks:

  • Reed-valve intake
  • Unique intake

Pros:

+ Very fast
+ Good torque
+ 6 ports

Cons:

- Wrong piston comes with the kit
- Metal reed-valves break easily. Recommended that you replace them by carbon valves.

Description:

  • Aluminum with nicasil wall
  • Intake port (variable): Raised intake as booster-port
  • Ports (122,75º): 4 ports + 1 wide booster
  • Exhaust port (165º): Oval
  • Blowdown: 21
  • Click to view port map


Eurocilindro/Athena AJH 70cc (45mm)

Fast 70cc reed-valve kit.

Cil53-resize.jpg Cil54-resize.jpg

Distinguishing marks:

  • Big reed-valve intake
  • Unique intake

Pros:

+ Wear-proof
+ Fast
+ Reed-valve
+ Intake large enough for a big carb

Cons:

- Piston is very sensitive at the ring-gap. A good replacement is a 70cc Polini piston for Honda MT5/MB5

Description:

  • Aluminum with nicasil wall
  • Intake (variable): Raised intake as booster port
  • Ports (128º): 4 ports + 1 wide raised booster (107º)
  • Exhaust port (165º): oval
  • Blowdown: 18.5
  • Click to view port map

Special points of interest:

  • Reed-valve intake.
  • Poor piston.
  • Comes with a 2-valve reed-valve, but takes a 4-valve Honda reed-valve with a simple riser & Honda intake.


Airsal 72cc (46mm)

New Airsal cylinder. Biggest displacement you can fit on a Puch without modifying the crank-case.

Cil55-resize.jpg Cil56-resize.jpg

Pros:

+ Big displacement without modifying crank-case
+ Comes with HC head
+ Massive torque hit in the midrange
+ Crazy high compression good for power if you set the timing back

Cons:

+ Case sometimes needs to be gently dremeled in order to make cylinder sleeve fit.
+ Cylinder sleeve is VERY thin, and can crack over time
+ Aluminum in HC head is very soft, may strip out spark plug threads after only a few months.
+ Piston hits head, requires two head gaskets or two base gaskets similar to metra 65.

Description:

  • Aluminum with nicasil wall
  • Intake port: oval
  • Ports (128º): 4
  • Exhaust port (175º): oval
  • Blowdown: 23.5
  • Click to view port map

Special points of interest:

  • Round intake that fits a 20mm carb
  • Available with a straight and angled exhaust port

Parmakit 75cc (47mm)

New cylinder with a LOT of tuning-potential

Cil57-resize.jpg Cil58-resize.jpg Cil59-resize.jpg Cil60-resize.jpg

Distinguishing marks:

  • Butterfly intake & exhaust port.

Pros:

+ Butterfly intake port
+ Butterfly exhaust port
+ Lots of torque because of the butterfly ports

Cons:

- 4 ports
- Comes without a head

Description:

  • Aluminum with nicasil wall
  • Intake port (132º): Butterfly port
  • Ports (132º): 2
  • Exhaust port (170.5º): Butterfly port
  • Blowdown: 19.25
  • Boost ports: 1
  • Click to view port map

Special points of interest:

  • Angled exhaust port.
  • Crank-case needs mod-work to fit cylinder.


Eurokit 75cc (47mm)

Cil61-resize.jpg Cil62-resize.jpg Cil63-resize.jpg

Distinguishing marks:

  • Extra ports in the cylinder wall.
  • Angled exhaust port.

Pros:

+ 8 ports

Cons:

- Discontinued

Description:

  • Aluminum with nicasil wall
  • Intake port: Oval
  • Ports: 4
  • Exhaust port: Oval
  • Boost ports: 2
  • Click to view port map

Special points of interest:

  • Special boost ports.
  • Angled exhaust port.
  • Crank-case needs mod-work to fit cylinder.


Gilardoni 75cc (47mm) (Reed-valve)

Gilardoni Reed size vs. Polini 4 petal

Gila reed vs polini.jpeg

Gila Ports

Gila ports.jpeg Cil64-resize.jpg Cil65-resize.jpg Cil66-resize.jpg Cil67-resize.jpg

Distinguishing marks:

  • Reed-valve
  • Square cooling ribs

Pros:

+ Reed-valve
+ Fast 75cc kit

Cons:

- Piston doesn't have the pin in the center

Description:

Special points of interest:

  • Minarelli Vertical intake fits without modification.
  • Minarelli AM6 (Aprilia, Rieju, newer Derbi's etc.) reed-valve fits without modification.
  • A lot of people say that you have to replace the piston with a Metrakit or Airsal piston, because the original piston isn't suitable for right-turning engines because of the off-center piston-pin.
  • Angled exhaust port.
  • Crank-case needs mod-work to fit cylinder.

Metrakit 75cc (47mm)

Cil68-resize.jpg Cil69-resize.jpg Cil70-resize.jpg

Distinguishing marks:

  • Big black cooling fins with unique shape

Pros:

+ Torque cylinder

Description:

  • Cast-iron
  • Intake port (153º): Oval
  • Ports (121º): 4
  • Exhaust port (175º): Oval
  • Blowdown: 27
  • Click to view port map

Special points of interest:

  • Angled exhaust port.
  • Crank-case needs mod-work to fit cylinder.
  • When fitting this cylinder you should mind the piston-rings. They come out of the intake, you need to push them back before sliding the piston further in.


Zeta 75cc (47mm)

Not much known.

Has a bad aluminum with nicasil wall.


Translated by SchijnHeilig

Original from Puchforum.com
Port maps originally posted on Puchforum.com (see the sticky in the tuning section) or Bromsprintforum.

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Puch Information
Puch Engine VariationsE50ZA50KoradoE50 (kickstart)Magnum XEngine differences (photos)
Puch PartsAluminum cylindersHigh torque cylindersBing
Puch PerformanceKit summarySpeed/setup tableExhaustsE50 crankshaftsIgnition system summary