VINTCO crankshaft bearing and seal kit for YAMAHA IT 125, IT 175, YZ 100, YZ 125, YZ 125 X, YZ 175 from 1976 to 1985

VINTCO offers this crankshaft bearing and seal kit for YAMAHA IT 125, IT 175, YZ 100, YZ 125, YZ 125 X, YZ 175 from 1976 to 1985. 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 YZ 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 IT 125 1981
YAMAHA IT 125 1980
YAMAHA IT 175 1983
YAMAHA IT 175 1982
YAMAHA IT 175 1981
YAMAHA IT 175 1980
YAMAHA IT 175 1979
YAMAHA IT 175 1978
YAMAHA IT 175 1977
YAMAHA YZ 100 1981
YAMAHA YZ 100 1980
YAMAHA YZ 100 1979
YAMAHA YZ 100 1978
YAMAHA YZ 100 1977
YAMAHA YZ 125 1985
YAMAHA YZ 125 1984
YAMAHA YZ 125 1983
YAMAHA YZ 125 1982
YAMAHA YZ 125 1981
YAMAHA YZ 125 1980
YAMAHA YZ 125 1979
YAMAHA YZ 125 1978
YAMAHA YZ 125 X 1976
YAMAHA YZ 175 1976