Myrons Mopeds

A29. 14x1 female side mount

A29 14×1 side mount
original  Not Available
A26 14×1 spigot left
substitute $18 no res.

Links to photos of examples:

1983 Trac Eagle original (installed at an angle)

The upper valve is an original Trac 14×1 side mount, made in Korea.
All their inner seal disks have decomposed.
But there is a replacement inner seal disk D2 for $8 see below.

The lower one is a modern Honda substitute, made in China. It is a 14×1 vertical mount spigot left mounted sideways. The cover panel must be removed, or a large hole cut, to allow access to the substitute valve. There is no reserve capacity on the substitute, since the reserve tube is horizontal. 

A28. 14x1 female spigot back

A28 14×1 sp back
with trap   $30
↑reserve ←off on↓
General original

A28a 14×1 spigot back
01z3264268 N/A
↑reserve ←off on↓
Italy-made by OMG

Links to photos of examples:

1977 Lazer Sport 50 original
1978 AMS Sierra 50 original
1984 Trac Image original
1985 General 5-Star original

Many of the original valves had poorly made cast nuts. The nuts were too big and also weak. When fully tightened they would strip. Some have good nuts, but after 35 years the rubber seal disk inside is brittle and deformed. All of the mopeds listed that came with a spigot-back gas valve, can take a less expensive spigot down or spigot left valve.

The A28a valve has a 7.7 mm spigot, for 1/4″ (6.3mm) fuel hose.

Honda Design: Note that the little arrow on the handle points opposite to the handle. So off is arrow left (handle right), on is arrow up (handle down), reserve is arrow down (handle up).

A27. 14x1 female spigot right

A27 14×1 spigot right
01z3234229 $25
↑reserve ←off on↓
Italy-made by OMG

Links to photos of examples:

1978 Moprix top tank original
1980 Yamaha QT50 (left is A25 substitute, right is original)
1979 General 5-Star ST original (use A28 or A26)

This valve configuration was original on Yamaha QT50, early Yamahas and Hondas, and early Taiwan mopeds. It can replace other 14×1 thread valves, in most cases.

This motorcycle fuel valve has a 7.7 mm spigot, for 1/4″ (6.3mm) fuel hose.

Honda Design: Note that the little arrow on the handle points opposite to the handle. So off is arrow left (handle right), on is arrow up (handle down), reserve is arrow down (handle up).

A26, A26a. 14x1 female spigot left

A26 14×1 spigot left
Golden  $19
A26a with shortened filter & reserve tube

Links to photos of examples:

1978 Honda NC50 Express original valve
1980 Honda NC50 Express original
1981 Honda NC50 Express original

Short reserve tube for short gas tanks.

A26a 14×1 spig. left
Golden  $18
↑res ←off  on↓
long reserve tube

Links to photos of examples:

1979 Oakwood Catalina replacement
(original was spigot-right)

Long reserve tube for tall gas tanks.

This spigot left valve was original on Honda NC50 Express. It also substitutes for other 14×1 thread valves, including Yamaha QT50 (spigot right), Honda NA50 (spigot down), Trac Eagle (side mount), and most Taiwan-made mopeds (mostly spigot back).

Honda Design: Note that the little arrow on the handle points opposite to the handle. So off is arrow left (handle right), on is arrow up (handle down), reserve is arrow down (handle up).

This valve has a 6.5 mm spigot, for a 3/16″ (4.8mm) hose, or a 1/4″ (6.3mm) hose with clamps.

A25. 14x1 female spigot down

A25 14×1 sp. down
633783  $19
↑reserve ←off on↓
made in China

Links to photos of examples:

1980 Honda NA50 Express II original
1979 Yamaha QT50 original spigot-back with trap
1980 Yamaha QT50 (left is A25 substitute, right is original)

This spigot down valve was original on 1979-81 Honda NA50 Express II. It also replaces the original spigot left on Honda NC50 Express, and the original spigot right on Yamaha QT50 Yamahopper.  

Honda Design: Note that the little arrow on the handle points opposite to the handle. So off is arrow left (handle right), on is arrow up (handle down), reserve is arrow down (handle up).

This valve has a 6.0mm spigot, for 3/16″ (4.8mm) hose.

A24. 12x1 female side mount Maxi

A24 12×1 side mt.
01z2141069a  $16
←reserve  on↓ off→
Italy-made by OMG

A24b 12×1 side mount
401400    none
⇐reserve  on⇓  off⇒
made in Taiwan

Links to photos of examples:

1976 Intramotor-Gloria Blanco original
1977 Intramotor-Gloria Blanco original
1977 Puch Maxi Sport original
1978 Puch Maxi original
1978 Puch Sport MKII with A24b
1984 Puch Maxi Sport LS original

Puch Maxi: The most popular 1970’s moped in the USA uses this valve. Puch Maxi and Maxi equivalents GN, Rigid, Sport, Sport MkII, Newport, Newport-L, Newport II and Maxi II all have the same sheet-metal gas tank built into the frame. The gas valve is on the right side mounted horizontally. 

A23. 12x1 female side mount Ciao

A23 12×1 side mount 5320   $18 
 ←reserve  on↓ off→
Italy-made by Franconi

A23b 12×1 side mt. 
01Z2141023A  $18   
←reserve  on↓ off→
 Italy-made by OMG

Links to photos of examples:

1974 Vespa Ciao frame

This valve fits a Vespa (Piaggio) Ciao. It can also fit a Puch Maxi type frame, but the upper filter hits the inside upper wall of the Puch gas tank. The reserve tube, which is a light press fit, can simply be rotated so it is not aimed straight up, to allow a Ciao valve to fit a Puch.

A22. 12x1 female spigot right long shaft

A22 12×1 right long shaft, price $19
01z2691051 ←reserve  on↓ off→ made in Italy by OMG

This shaft is 56 mm long, too long for a Benelli G2 or a Tomos Targa. The handle hits the pedal or the rider’s shoe. It needs to be 15 to 25mm shorter. 

A21. 12x1 female spigot right medium shaft

A21 12×1 spigot right
long shaft 5321 $15
←reserve  on↓ off→
Italy-made by Mec Eur

Links to photos of examples:

1978 Baretta 44 original
1978 Vespa Grande original
1979 Vespa Grande frame with no valve
1979 Vespa Grande with spigot right
1980 Vespa Si original
1985 Vespa Si frame with original valve

Vespa Grande: The Vespa Grande has a vertical type valve, but it is mounted at an angle of about 60 degrees from vertical, or “2 o’clock”, as seen in the red frame photo. Although the spigot direction is wrong, this still works fine on a Vespa Grande. The gas has to go uphill a little at first, but the gas hose stays below the bottom of the gas tank (when routed under the throttle cable like shown below). So it will flow gasoline all the way to empty.

Tomos Targa: While the Tomos Targa valve works on a Vespa Si, the opposite is not true. The Tomos engine is too close, unless the cover is left off and the valve is rotated.

A20. 12x1 female spigot left medium shaft

 A20 12×1 spigot left, medium shaft, price $20
229169 ←reserve  on↓ off→ Taiwan-made by FS 401601
Photos:  1995 Tomos Targa original, 1998 Tomos Targa original, 2005 Tomos ST original
can use A20a with a longer fuel hose

A20a 12×1 spigot down, medium shaft, price $15
3174 ←reserve  on↓ off→ Italy-made by Franconi

A20b 12×1 spigot right, short shaft, price $29
01Z2391037-modified ←reserve  on↓ off→ Italy-made by OMG
Photos: 1978 Moto Guzzi Robin original, 1979 Benelli G2 original

Benelli G2 The valve shaft sticks out of a small hole in the plastic side cover. To get the shaft through the hole in the plastic side cover, the black handle knob must be pried off and the metal rod unscrewed. The valve must be aimed just right. It might take 2 or 3 guesses to get the shaft aimed at the hole. Then the plastic cover is replaced, and then the handle knob is pressed back onto the shaft.

Tomos A35 ’92-06 The A20 original valve (right) has a hose spigot left. The A20a replacement valve (left) has a hose spigot down. The carburetor fuel inlet banjo, on the far side, can rotate to make the hose any angle. That allows the A20a to replace an A20.

Left, A20a. Right, A20.