How long does a top end last on YZ125?

How long does a top end last on YZ125?

35-40 hours
We have seen up to 35-40 hours on a YZ125 top end but that’s stretching it a bit far and we wouldn’t recommend prolonging standard maintenance that long.

When should you rebuild a YZ125?

Going by the book, a 125 should be inspected and/or replaced every 5-10 hours of racing. In the other hand, if you’re just casually trail riding and don’t care if you lose a little bit of power after a while, you could easily go 50-100+ hours before needing to replace engine parts.

How much HP does a 2001 YZ125 have?

33.53 hp
In 2001, Yamaha released a bike designed to complement the YZ125, the four-stroke YZ250F….Yamaha YZ125.

How do you break in a 2 stroke engine after rebuilding?

Start the engine and allow it to run at idle speed until it is thoroughly warmed up, then stop the engine and allow it to cool completely. Start the engine and allow it to warm up thoroughly. Then ride the motorcycle for ten minutes using no more than half throttle. Avoid lugging the engine.

How long does a top end rebuild take?

A four-stroke top end is generally rebuilt at the 25-30 hour mark if you’re a regular racer, and more importantly on a 250F, which is typically ridden more aggressively. On a 450, or if you’re riding the bike under an ‘easy’ load, then rebuilding the top end between 30-40 hours will be adequate.

How often do you have to rebuild a 125 2 stroke?

It’s also important to keep in mind that if you’re running your two-stroke on the lean side, it may need more frequent rebuild intervals. As a general rule, and especially if you’re racing, rebuilding the top end – which includes piston and rings – every 25 hours would keep you in the safe range.

What does YZ stand for on a dirt bike?

YZ- Yamaha zinger. RM- Race model. WR- wide ratio. SX- supercross. Not sure about KX or XR.