VINTCO crankshaft bearing and seal kit for YAMAHA DT 125, DT 175, MX 125, MX 175, YZ 100, YZ 125 from 1974 to 1983

VINTCO offers this crankshaft bearing and seal kit for YAMAHA DT 125, DT 175, MX 125, MX 175, YZ 100, YZ 125 from 1974 to 1983. The crankshaft spins on two large bearings in the cases, protected by oil seals. They take all the engine’s force; after many hours they develop play and vibration appears.

What is this bearing made of?

Races and balls (or rollers) in hardened chrome steel, 100Cr6 type: a very hard steel that withstands the fatigue of millions of engine revolutions.

• Open bearing: unsealed, it is lubricated and cooled by the engine oil; clean oil is its best protection.
• C3 / C4 internal clearance: slightly more clearance than normal for a hot engine’s expansion; always refit the original clearance.
• Limit: it dislikes dust and old oil; running short of oil destroys it within minutes.

Why choose VINTCO?

Vintco supplies Japanese-made crankshaft bearings for a reliable rebuild of vintage engines.

When should you replace the bearings on your YAMAHA DT 125?

Unusual vibration, a deep knock that follows engine speed or play in the con-rod: the bottom end needs a rebuild.

The manufacturer publishes no hour interval for this model: have the con-rod play checked at every piston change. Cross-Mania guideline: rebuild the bottom end every 2 to 3 top-end rebuilds.

Specifications and fitting tips

• Includes the bearings and seals needed to install the crankshaft
• Includes OEM-quality bearings made in Japan

Cross-Mania tip: Heat the cases to remove and fit the bearings without forcing them, and replace the oil seals at the same time.

Compatibility

Check the exact model and year of your bike in the list below before ordering.

Fits:
YAMAHA DT 125 1981
YAMAHA DT 125 1980
YAMAHA DT 125 1979
YAMAHA DT 125 1978
YAMAHA DT 125 1977
YAMAHA DT 125 1976
YAMAHA DT 125 1975
YAMAHA DT 125 1974
YAMAHA DT 175 1981
YAMAHA DT 175 1980
YAMAHA DT 175 1979
YAMAHA DT 175 1978
YAMAHA DT 175 1977
YAMAHA DT 175 1976
YAMAHA DT 175 1975
YAMAHA DT 175 1974
YAMAHA MX 125 1976
YAMAHA MX 175 1981
YAMAHA MX 175 1980
YAMAHA MX 175 1979
YAMAHA MX 175 1975
YAMAHA MX 175 1974
YAMAHA TY 175 1975
YAMAHA YZ 100 1983
YAMAHA YZ 100 1982
YAMAHA YZ 125 1977
YAMAHA YZ 125 1976
YAMAHA YZ 125 1975
YAMAHA YZ 125 1974