Balance Shaft Kits

Is the engine in your ATV or UTV vibrating more than normal, or does the balance shaft need replacing during an engine rebuild? In this category you will find balance shaft kits from Hot Rods for a range of models from, for example, Polaris and Yamaha. Each kit is made for a specific model, year and displacement.

What does a balance shaft do?

The balance shaft rotates in sync with the crankshaft and typically counteracts the vibrations created as the piston moves up and down. If the shaft, gears or bearings are worn, vibrations can become stronger and put more stress on the engine, frame and fasteners. A balance shaft kit from Hot Rods can be used for a repair or as part of a larger project, for example together with an engine rebuild kit.

How to choose a balance shaft kit

These factors determine whether the kit fits your machine:

• Model and year: The kits are made for specific models and years, e.g. Polaris RZR 570 from 12-20 or Yamaha YFM 700 R Raptor. Compare the product name carefully with your machine.
• Displacement: The same model name can cover several engine sizes, so also check the cc.
• Modified engine: If the engine has been given a longer stroke with one of our stroker kits, the balance can change. So check whether the kit is intended for a stock engine.
• Contents: What is included depends on the kit. Read the description before you order gaskets and other parts.

During installation, the balance shaft typically has to be timed correctly to the crankshaft using the marks on the gears. If the timing is wrong, vibrations can become stronger. Follow the service manual for your model. You will find other engine parts under engine kits and rotating assemblies.

Frequently asked questions

How can I tell that the balance shaft is worn?

Typical signs are more vibration in the handlebars and frame, or rattling and clicking noises from the engine. However, the same symptoms can have other causes, such as worn engine mounts, so have the engine inspected before you replace parts.

Does the balance shaft need to be timed during installation?

Typically, yes. The balance shaft must be positioned correctly relative to the crankshaft, which is normally ensured by timing marks on the gears. If it is out of position, vibrations can become stronger. Always follow the service manual for your model.

Can I use a kit for a different year of the same model?

Only if your year is listed in the product name. Each kit states model, year and displacement, e.g. 09-20 Polaris RZR 170, and parts may change from year to year. Always check the part number against your machine.