Shaun « Myrons Mopeds

A40. 14x1 female vacuum-operated automatic

A40 14×1 vacuum
G2IX9 634176
Honda NX50 $15

Replaces Honda 16950-187-671 and 16950-GN2-671. 6mm hose spigots

Links to photos of examples:

1981 Honda NX50 original

A38. 22x1 female spigot down

A38 22×1 spig. down
for 70’s Jawa none
←res on↓ off→

Links to photos of examples:

1978 Jawa 207 original
1979 Jawa 207 original
Jawa 207 with A38 installed with cover off

The chrome replacement Jawa petcock A38 is at left. Original is at right. The handle does not stick out of the hole in the side cover like the original did. So it is a little hard to reach but not too hard.

A37 Petcock

July 14, 2022

A37. 16x1.5 female spigot down

16×1.5 spigot down N/A
16950-045-005 Off-On only

In most cases, spigot right (above) can substitute for spigot down. The valve can be aimed at any angle, so “right” can become “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).

A36 Petcock

July 14, 2022

A36. 16x1.5 female spigot right

A36 (bottom) 16×1.5 spigot right $20
↑reserve ←off on↓ made in Taiwan

This is a vertical mount valve for ’82-83 Honda NC50I Iowa, and some 60’s and 70’s Honda motorcycles and ATV’s.

Indian valve substitute: The threads fit an Indian 4-stroke moped. This valve A36 will substitute for an Indian gas valve A35, but the cover panel would have to be left off. With the cover on you cannot reach the handle.

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

A36a with reserve $34

A36 is a modern substitute 16×1.5, made in Taiwan. It is a vertical design, mounted horizontal. 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.

A36a is valve A36 with a added aluminum reserve tube that curves upward.

A35 Petcock

July 14, 2022

A35. 16x1.5 female side mount

A35 Indian 16×1.5 side-mount Not Available

A turnbuckle nut none M16-1.5 R and L
B outer seal ring none 12 x 16 x 2
Bs B substutute $5.00 10 x 16 x 1
C valve body xxx none 20.9 ID
D trap filter disk none 19 x 1.5
E trap seal ring x $2.50 15 x 19 x 2
F trap cup xxxxx $5.00 M20-1.0 thread (Trac Eagle)
G seal disk xxxx $11.0 20.5 x 3.25 4-hole D10
H handle plate x none 21.3 OD
I wave washer (2) none 20 x 16 x 0.3
J face plate xxxx none 17 ID
K face screw (2) $1.50 M3 x 6

A35 is an original Indian 16×1.5 side mount, made in Taiwan. All 3 rubber seals have decomposed.

The 2 seal rings do not normally leak if they are undisturbed, but the seal disk does. There are two ways the seal disk can leak.

1) It can keep supplying the carburetor with gasoline when in the OFF position. This leak can be stopped temporarily by pinching the fuel hose with a small vise grip or C clamp.

2) It can leak gasoline outside of the valve when the handle is in any position. Other things besides the seal disk can cause this kind of leak. Some of those things are: improper assembly, damaged handle plate, missing wave washer, damaged valve body, pieces of the old seal disk still stuck to the valve body sealing surface.

Outer seal ring: The 17mm substitute outer seal ring sits in a 16 mm groove. But it has to fold to pass over 14.5 mm thread tops on its way in, Once in it can be unfolded and does fit, but tightly.

A34 Petcock

July 14, 2022

A34. 16x1 female, side mount

A34 petcock, 16×1 side mount, price $32
made in the 1970’s in Italy by Paioli
A34 is for Euro model KTM Foxi and Hobby mopeds, not US versions.
A33 is for US model KTM Foxi mopeds.

A34 will substitute for A33 if a hole is cut in the top of the right side cover.

A33 Petcock

July 14, 2022

A33. 16x1 female side mount

A33 petcock, 16×1 side mount, none available
made in the 1970’s in Italy by Paioli
A33 is for US model KTM Foxi mopeds, not Euro versions.
A34 is for Euro model KTM Foxi and Hobby mopeds.