If your Yamaha ATV makes a thumping noise on startup, you may have to re-grease the clutch.

Before you spend money on a new ECU for your Yamaha ATV, run some tests on the charging and ignition systems.

Is your Yamaha ATV stuck in neutral after a complete brake job? Partzilla's Yamaha ATV expert John Talley weighs in on what could be wrong. 

When a Yamaha ATV is low on oil but has no leaks, does that mean an oil ring has gone bad? Not necessarily. John Talley weighs in on Yamaha Grizzly oil consumption. 

When it comes to the right coolant for a Yamaha ATV, can you go wrong with the OEM brand? Here's what ATV expert John Talley says about the right coolant for a YFM700.

Should I add more coolant to my Yamaha ATV? John Talley answers a viewer's question about setting the coolant level in a Yamaha quad.

From a Grizzly 700 that starts then cuts out to another that shuts off when idling, here are some questions and answers about YFM700 starting problems. 

Not all ATVs are great for mudding, but these four quads are champs at powering through sludge.

Got a Yamaha ATV that's not performing well after a wet clutch installation? John Talley offers advice for a Grizzly 660 with this problem.