Puch Cylinder Information
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
+ Reliable
+ Wear-proof
- Discontinued
Aluminium with chromed wall
Intakeport: oval
Ports: 2
Exhaustport: 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
+ Reliable
- Discontinued
Cast-iron
Intakeport: oval
Ports: 2
Exhaustport: 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.
+ Reliable
+ Cheap
- Rattles somewhat
- Poorly finished
Aluminium with nicasil wall
Intakeport: oval
Ports: 2
Exhaustport: oval
Special points of interest:
Finishing the edges of the ports is recommended.
Zeta 50cc (fast) (38mm)
+ Accelerates faster than stock Puch cylinders
+ Has a higher top speed than stock Puch cylinders
+/- Powerband comes higher than stock Puch cylinders
- 4 ports
Cast-iron
Intakeport: oval
Ports (128º): 2
Exhaustport (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.
+ Reliable
- Sometimes poorly finished
- 4 ports
Aluminium with nicasil wall
Intakeport: oval
Ports: 2
Exhaustport: oval
Special points of interest:
Good timing and most of the times the fnish on the ports is good.
50cc TCCD / RGD (fast) (38mm)
Very fast 50cc.
+ Fast
+ 6 ports
- Poor piston
Aluminium with nicasil wall
Intakeport: oval
Ports (114º): 4
Exhaustport (164º): oval
Blowdown: 25
Metrakit 50cc (38mm)
Fast 50cc.
+ Fast
- Expensive
Distinguishing marks:
Big black cooling fins with unique shape
Cast-iron
Intakeport: oval
Ports (?º): 4
Exhaustport (?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
+ Wear-proof
+ VERY fast
+ Reed-valve intake
+ Fits a big carb
- Pistons are hard to get
Aluminium with chrome wall
Intakeport (variable): Raised intake as booster-port
Ports (121º): 4 main ports + 1 booster-port (114º)
Exhaustport (175º): oval
Blowdown: 27
Special points of interest:
Reed-valve intake
Pulls hard & has high topspeed.
Reaches 12.000 RPM unmodified.
Comes with a 2-valve reed-valve, but takes a 4-valve Honda reed-valve with a simple riser & Honda intake.
Autisa 60cc (42mm)
Aluminium with nicasil wall
Intakeport (110º): Oval with half bar in the top
Ports (128º): 2
Exhaustport (158º): oval
Blowdown: 15
Special points of interest:
Pretty rare cylinder
Half bar in the intake.
Malossi 60cc (42mm)
+ Pretty quick for a 60cc
- Exhaustport is hard to modify
Aluminium with nicasil wall
Intakeport (122º): oval
Ports (110º): 2
Exhaustport (159º): oval
Blowdown: 24,5
Boostports (90º): 2
Diameter exhaustport: 25mm
Special points of interest:
Piston-ring-gap goes between the exhaustport & intakeport.
Metrakit 65cc (43,5mm)
Good torque cylinder. Pulls well at every RPM.
Distinguishing marks:
Black cooling fins
Last cooling fins have a sloped edge
+ Very good pull from low RPM
- 4 ports
Cast-iron
Intakeport: oval
Ports (114º): 2
Exhaustport (153º): oval
Blowdown: 19,5
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
+ Cheap
+ Reliable
- Poorly finished
- 4 ports
Aluminium with nicasil wall
Intakeport: oval
Ports (114º): 2
Exhaustport (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.
Distinguishing marks:
Reed-valve intake
Unique intake
+ 7 ports
+ Good finish
+ Reed-valve
+ VERY torquy
- Expensive as hell
- Pistons are expensive too
- Needs very good carb tuning and oil-mixture
Aluminium with chrome wall (old models)
Aluminium with nicasil wall (new models)
Intakeport (variable): 7 including 3 boosters (114º)
Ports (114º): 4 ports + 3 boosters
Exhaustport (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:
Boosterport that goes into the intake
+ Reliable
+ Wear-proof
- Discontinued
- 4 ports
- Intake is hard to modify, the boosterport gets in your way
- Foot-gasket thickness comes very close. The boosterport in the piston might be in front of the intake, so it doesn't run.
Cast-iron
Intakeport: Square, U-shape
Ports (114º): 4
Exhaustport (164º): Oval
Blowdown: 25
Special points of interest:
Speciae boostport.
Airsal 70cc (45mm)
Very nice cylinder. A lot of people say: The perfectly timed cylinder.
Distinguishing marks:
Round logo on cooling fin
+ Cheap
+ Reliable
+ Well timed
- Rattles
- 4 ports
- Poorly finished
Aluminium with nicasil wall
Intakeport (138º): oval
Ports (114º): 2
Exhaustport (170º): oval
Blowdown: 28
Boostports (114º): 2
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.
+ Cheap
+ Well timed
+ 6 ports
Aluminium with nicasil wall
Intakeport (127º): oval
Ports (121º): 4
Exhaustport (164º): oval
Blowdown: 21,5
Boostports (114º): 2
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)
+ Cheap
+ 6 ports
- Poorly finished
Aluminium with nicasil wall
Intakeport (138º): oval
Ports (114º): 4
Exhaustport (153º): oval
Blowdown: 19,5
Boostports (107º): 2
Special points of interest:
Good tuning material
Good piston & rings.
Polini 70cc (45mm)
Very fast 70cc cylinder. Sadly discontinued.
Distinguishing marks:
Special port-shape
+ VERY fast
+ 6 portd
- Discontinued
Aluminium with chrome wall
Inltakeport: oval
Ports (105º): 4
Exhaustport (175º): oval
Blowdown: 35
Boostports: 2
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)
+ Wear-proof
+ Good torque
- Pretty expensive
Aluminium with nicasil wall
Intakeport (140º): oval
Ports (105º): 4
Exhaustport (160º): oval
Blowdown: 27,5
Boostports (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
+ Very fast
+ Good torque
+ 6 ports
- Wrong piston comes with the kit
- Metal reed-valves break easily. Recommended that you replace them by carbon valves.
Aluminium with nicasil wall
Intakeport (variable): Raised intake as booster-port
Ports (122,75º): 4 ports + 1 wide booster
Exhaustport (165º): Oval
Blowdown: 21
Eurocilindro/Athena AJH 70cc (45mm)
Fast 70cc reed-valve kit.
Distinguishing marks:
Big reed-valve intake
Unique intake
+ Wear-proof
+ Fast
+ Reed-valve
+ Intake large enough for a big carb
- Piston is very sensitive at the ring-gap. A good replacement is a 70cc Polini piston for Honda MT5/MB5
Aluminium with nicasil wall
Intake (variabel): Raised intake as boosterport
Ports (128º): 4 ports + 1 wide raised booster (107º)
Exhaustport (165º): oval
Blowdown: 18,5
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.
+ Big displacement without modifying crank-case
+ Comes with HC head
Aluminium with nicasil wall
Intakeport: oval
Ports (128º): 4
Exhaustport (175º): oval
Blowdown: 23,5
Special points of interest:
Round intake that fits a 20mm carb
Available with a straight and angled exhaustport
Parmakit 75cc (47mm)
New cylinder with a LOT of tuning-potential
Distinguishing marks:
Butterfly intake & exhaust port.
+ Butterfly intakeport
+ Butterfly exhaustport
+ Lots of torque because of the butterfly ports
- 4 ports
- Comes without a head
Aluminium with nicasil wall
Intakeport (132º): Butterfly port
Ports (132º): 2
Exhaustport (170,5º): Butterfly port
Blowdown: 19,25
Boostports: 1
Special points of interest:
Angled exhaustport.
Crank-case needs mod-work to fit cylinder.
Eurokit 75cc (47mm)
Distinguishing marks:
Extra ports in the cylinder wall.
Angled exhaustport.
+ 8 ports
- Discontinued
Aluminium with nicasil wall
Intakeport: Oval
Ports: 4
Exhaustport: Oval
Boostports: 2
Special points of interest:
Special boostports.
Angled exhaustport.
Crank-case needs mod-work to fit cylinder.
Gilardoni 75cc (47mm) (Reed-valve)
Distinguishing marks:
Reed-valve
Square cooling ribs
+ Reed-valve
+ Fast 75cc kit
- Piston doesn't have the pin in the centre
Aluminium with nicasil wall
Intakeport (variable): 1 booster (119º)
Ports (123º): 4 ports + 1 booster (119º)
Exhaustport (178º) : Oval
Blowdown: 27,5
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 by a Metrakit of Airsal piston, because the original piston isn't suitable for right-turning engines because of the un-centered piston-pin.
Angled exhaustport.
Crank-case needs mod-work to fit cylinder.
Metrakit 75cc (47mm)
Distinguishing marks:
Big black cooling fins with unique shape
+ Torque cylinder
Cast-iron
Intakeport (153º): Oval
Ports (121º): 4
Exhaustport (175º): Oval
Blowdown: 27
Special points of interest:
Angled exhaustport.
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 aluminium with nicasil wall.
Translated by SchijnHeilig
Original from PuchForum.net
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