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.
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.
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.
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.
Port map:
Zeta 50cc (fast) (38mm)
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.
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:
- Aluminum with nicasil wall
- Intake port: oval
- Ports: 2
- Exhaust port: oval
- Click to view port map
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.
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.
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
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
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)
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)
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"
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.
Distinguishing marks:
- Black cooling fins
- Last cooling fins have a sloped edge
Pros:
- + Very good pull from low RPM
Cons:
- - 4 ports
Description:
- Cast-iron
- Intake port: oval
- Ports (114º): 2
- Exhaust port (153º): oval
- Blowdown: 19.5
- Click to view port map
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.
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]
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
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.
Distinguishing marks:
- Round logo on cooling fin
Pros:
- + Cheap
- + Reliable
- + Well timed
Cons:
- - Rattles
- - 4 ports
- - Poorly finished
Description:
- Aluminum with nicasil wall
- Intake port (138º): oval
- Ports (114º): 2
- Exhaust port (170º): oval
- Blowdown: 28
- Boost ports (114º): 2
- Click to view port map
- Click to view second port map
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.
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.
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:
- Aluminum with nicasil wall
- Intake port (138º): oval
- Ports (114º): 4
- Exhaust port (153º): oval
- Blowdown: 19,5
- Boostports (107º): 2
- Click to view port map
- Click to view second port map
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.
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.
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.
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.
Distinguishing marks:
- Big reed-valve intake
- Unique intake
Pros:
- + Wear-proof
- + Fast
- + Big 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
- - Cylinder ports about 3mm blocked by piston but can be run without spacing
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
- Reed Cage bolt spacing CC is 61.5mm x 40mm
- Cylinder skirt outer diameter 48mm
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.
- Derbi Reed valves fit with angle spacer and a 15mm paralel spacer
- If installed right out of box ports will be blocked by piston, To correct a spacer will need to be made + deck cylinder or make a countersunk head to fix squish (port timings will be around Transfer 131 degree, Exhaust 190 degree. good for turning 10k rpm!)
Airsal 72cc (46mm)
New Airsal cylinder. Biggest displacement you can fit on a Puch without modifying the crank-case.
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. Puch Zeta clone with worse casting.
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)
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 Ports
Distinguishing marks:
- Reed-valve
- Square cooling ribs
Pros:
- + Reed-valve
- + Fast 75cc kit
Cons:
- - Piston doesn't have the pin in the center
Description:
- Aluminum with nicasil wall
- Intake port (variable): 1 booster (119º)
- Ports (123º): 4 ports + 1 booster (119º)
- Exhaust port (178º) : Oval
- Blowdown: 27.5
- Port Map via http://team-nerdspeed.blogspot.com
- Click to view port map
- Click to view second port map
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)
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.
| Puch Information | |
|---|---|
| Puch Engine Variations | E50 • ZA50 • Korado • E50 (kickstart) • Magnum X • Engine differences (photos) |
| Puch Parts | Aluminum cylinders • High torque cylinders • Bing |
| Puch Performance | Kit summary • Speed/setup table • Exhausts • E50 crankshafts • Ignition system summary |
