VintageCB750 Supplying CB Riders Since 2010

About Us Why Us? Reviews Shipping Info Returns Contact Us
Wish Lists
0 My Cart

Your cart is currently empty.

Browse all parts
Total (USD): $0.00
View cart
Menu
Search
Wish
Cart 0
My motorcycle Choose your Honda CB model

Search parts

Searching all Honda CB parts

Example: brake pads or oil filter.

1981 Honda CB125S Engine Parts

For the 1981 Honda CB125S, this engine guide focuses on replacement tappet-adjuster hardware. The featured set combines a screw with its nut, making package contents clear while you compare the original parts and plan the work your engine needs.

Close ×
Your saved bike Choose your Honda CB model

Shop By Category

Most orders ship same or next business day Fitment guarantee Listed for your exact model and year? We’ll make it right if it doesn’t fit as described. Mechanic-backed support Ask our team for help choosing the right Honda CB part.
Currently viewing Engine

Honda motorcycle parts

Choose your model and year to see parts listed for your bike.

Honda CB Piston Pin Clips 15mm Pk/2 ~ Replaces 94601-15000

Honda CB Piston Pin Clips 15mm Pk/2 ~ Replaces 94601-15000

$1.95 USD
05-7201
Secure your piston pins with this 2-pack of 15mm Piston Pin Clips, Japanese made to superior quality and replacing OEM Ref. #94601-15000. Exceptionally broad...
Honda CB750 CB650 CB550 tappet adjuster screw and nut set 90012-426-000

Honda CB Tappet Adjuster Screw & Nut Set ~ Replaces 90012-426-000

$4.61 USD
49-0784
Replace your tappet adjuster screws and nuts with this Tappet Adjuster Screw & Nut Set. Each set includes one tappet adjuster screw and one...
Honda CB125S clutch cover gasket 11393-KT0-710

1981-82 Honda CB125S Clutch Cover Gasket ~ Replaces 11393-KT0-710

$9.94 USD
73-1194
Ensure a proper seal during clutch maintenance or engine rebuilds with this high‑quality Clutch Cover Gasket. Engineered to meet OEM standards, it’s the perfect...
Sold out
Honda CB750 CB700 performance magnetic oil drain plug joker machine

Honda CB Performance Magnetic Oil Drain Plug ~ Joker Machine

$49.95 USD
73-1074
Catch metal debris from your engine with this Joker Machine Brand Custom Performance Magnetic Oil Drain Plug, 12mm dia x M1.5, OEM #92800-12000.The plug...
Honda CB125 CB100 oil pump gasket 15126-107-020

Honda CB125 / CB100 Oil Pump Gasket ~ Replaces 15126-107-020

$2.95 USD
73-1196
Ensure a secure, leak-free seal during your engine rebuild or maintenance with this Oil Pump Gasket. Precisely engineered to replace OEM# 15126-107-020, this gasket...
New
Honda CB125 CB100 tappet adjusting hole cap 12361-383-000

Honda CB125 / CB100 Tappet Adjusting Hole Cap ~ Genuine Honda 12361-383-000 ~ Replaces 12361-383-000

$13.50 USD
99-5199
This genuine Honda tappet adjusting hole cap closes the valve adjustment access opening on the Honda models listed below. It is also commonly searched...
New
Honda CB650 CB550 CB500 piston pin 13111-440-000

Honda CB Genuine Honda Piston Pin ~ OEM 13111-440-000 / 13111-286-000

$18.95 USD
99-5321
Upgrade or restore your classic Honda motorcycle with this Genuine Honda Piston Pin — precision‑engineered and made in Japan. This authentic replacement fits and...
New
Honda CB125S exhaust valve 14721-437-000

1980-85 Honda CB125S Exhaust Valve ~ Replaces 14721-437-000

$19.95 USD
01-9966
Restore proper engine performance with this Exhaust Valve, designed as a direct replacement for the original Honda component. This valve replaces OEM part number...
New
Honda CB125S intake valve 14711-440-003

1980-82 Honda CB125S Intake Valve ~ Replaces 14711-440-003

$19.95 USD
01-9965
Restore proper engine performance with this Intake Valve, designed as a direct replacement for the original Honda component. This valve replaces OEM part numbers...
New
Honda CB125 CB100 Honda oil filter screen spring 15426-107-000

Honda CB125 / CB100 Genuine Honda Oil Filter Screen Spring ~ OEM 15426-107-000

$25.00 USD
99-5044
Upgrade or restore your classic Honda motorcycle with this Genuine Honda Oil Filter Screen Spring — precision‑engineered and quality made in Japan. This authentic...
New
Honda CB100 CB125 oil filter screen 15421-107-000

Honda CB100 / CB125 Oil Filter Screen ~ Replaces 15421-107-000

$5.64 USD
01-8998
Protect your small-displacement Honda's engine with this Oil Filter Screen, a direct replacement for OEM #15421-107-000. Fits the CB100K and CB125S series, filtering debris...
Honda CB125S pulse generator base gasket 12339-KT0-710

1981-82 Honda CB125S Pulse Generator Base Gasket ~ Replaces 12339-KT0-710

$5.96 USD
73-1199
Ensure a proper seal with this high-quality replacement Pulse Generator Base Gasket. Designed to match OEM specifications, this gasket is essential when servicing or...
Honda CB125 CB100 oil filter cap gasket 15459-KT0-710

Honda CB125 / CB100 Oil Filter Cap Gasket ~ Replaces 15459-KT0-710

$5.95 USD
73-1197
Maintain proper oil system sealing with this high-quality Oil Filter Cap Gasket. This direct replacement meets OEM specifications to ensure a leak-free seal when...
Honda CB125S crankcase center gasket 11191-KT0-710

1981-82 Honda CB125S Crankcase Center Gasket ~ Replaces 11191-KT0-710

$13.51 USD
73-1195
Restore your engine’s integrity with this high-quality Crankcase Center Gasket. Designed to match OEM specifications, it provides a precise seal between crankcase halves —...
Honda CB125S pulse generator cover gasket 30372-437-010

1976-82 Honda CB125S Pulse Generator Cover Gasket ~ Replaces 30372-437-010

$8.27 USD
73-1198
Restore factory sealing and protect your engine with this Pulse Generator Cover Gasket, designed to replace worn or damaged gaskets. Made to meet OEM...
Honda CB125 cylinder head gasket 12251-437-P00

1973-85 Honda CB125 Cylinder Head Gasket ~ Replaces 12251-437-P00

$14.95 USD
73-1192
Restore compression and prevent leaks with this high‑quality Cylinder Head Gasket. This gasket is engineered to meet OEM specifications for a precise fit and...
Honda CB125S cam chain 25H x 98 14401-383-003

1976-85 Honda CB125S Cam Chain ~ 25H x 98 ~ Replaces 14401-383-003

$31.72 USD
52-3013
Replace your CB125S cam chain with this Cam Chain 25H x 98, replacing OEM #14401-383-003 / #14401-428-003 / #14401-439-003. D.I.D (Daido) brand. Pitch .25,...
Honda CB125S cylinder base gasket 12191-KT0-710

1981-82 Honda CB125S Cylinder Base Gasket ~ Replaces 12191-KT0-710

$5.88 USD
73-1193
Maintain proper compression and prevent leaks with this high‑quality Cylinder Base Gasket. Designed to OEM specifications, this gasket is a reliable replacement for worn...
Honda CB400 CB450 CB125 valve stem seal 12208-413-003

Honda CB400 / CB450 / CB125 Valve Stem Seal

$3.10 USD
01-0128
Stop top-end oil loss with this Valve Stem Seal, a replacement for OEM #12208-413-003 / #12209-KL4-005 / #12209-428-003. Fits a range of smaller-displacement Hondas,...
compare

1981 Honda CB125S · Engine Buying guide

Choose the tappet hardware your repair needs

The adjuster screw and nut are supplied together. Match both reference numbers to your repair, then choose the number of sets needed for the adjusters you intend to replace.

Parts to consider

Honda CB Tappet Adjuster Screw & Nut Set ~ Replaces 90012-426-000 Tappet adjuster screw & nutOne adjuster screw and one nut per set. Replaces references 90012-426-000 and 90206-250-000.View part

Match the screw and its nut

The replacement uses separate references for the screw and nut: 90012-426-000 and 90206-250-000. Keep the removed components together while checking the order, so a comparison of the screw does not overlook the nut needed with it.

Keep adjustment specifications separate

Choosing replacement hardware is only part of the repair. Use the service manual appropriate to the engine for valve-clearance settings and adjustment instructions. Keep those specifications with your work notes rather than relying on a product reference to establish the setting.

Common buying questions

Does a set include both pieces?

Yes. Each set contains one tappet adjuster screw and one nut. Order by the number of adjuster assemblies being renewed; the set description does not specify a complete-engine quantity for the CB125S.

Is this adjuster listed for the 1981 CB125S?

Yes. Its stated CB125S application is 1981–82. That year range is useful when comparing similar-looking hardware, particularly if you are sorting parts from more than one CB125S engine.

What if my CB125S has a replacement engine?

Identify the engine before relying on the motorcycle’s registration year. Compare the required screw and nut references with the fitted components, and resolve any mismatch before ordering the adjuster set.

Not sure which part you need?

Send your model and year, plus photos of your existing part and any changes to the original setup.

Ask a fitment question
Parts categories for 1981 Honda CB125S

Your cart

×