Puch cylinder kit summary
From MopedWiki
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.
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
Cons:
- - 4 ports
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
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.
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
- Click to view second 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): 7 including 3 boosters (114º)
- 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 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.
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)
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.
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
- + 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.
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 his 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
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)
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
- 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 |