YZ250 2-stroke hours?

[HEKTIC]

Asking the experts here. How many hours should a YZ 250 top end last? I know it varies per rider and how it's ridden but let's just say a fast young intermediate. How often should it be changed before we should expect it to go kaboom?

[walent215]

25-30 hours imo....

[Hack-Man162]

It might last 60-70 hours before kaboom, but for best performance, you are probably looking at about 30 hours.

[billyghog]

20-25 for me.

[Dirt Addict]

What do you guys recommend for a 125?

[HEKTIC]

Thanks for the info guys. Appreciate it.

[billyghog]

What do you guys recommend for a 125?

15 or so depending on how fast you are.

[nickvalve]

No need to play guessing games , pull the pipe off , look at the piston ring [ rings ]  if the ring is flat , full width , its time. If its good you will see the 45degree flats [ grayish] top and bottom of the ring. If its worse , brown to black deposits below the ring indicates blow-by and time for top end.

[Spode]

No need to play guessing games , pull the pipe off , look at the piston ring [ rings ]  if the ring is flat , full width , its time. If its good you will see the 45degree flats [ grayish] top and bottom of the ring. If its worse , brown to black deposits below the ring indicates blow-by and time for top end.

thanks Nick im doing this inspection today

[batotal]

Asking the experts here. How many hours should a YZ 250 top end last? I know it varies per rider and how it's ridden but let's just say a fast young intermediate. How often should it be changed before we should expect it to go kaboom?

Depends on if the "fast young intermediate" has the bad habit of many youngsters these days such as  opening the throttle whilst airborne just to make him or herself sound fast.

With two strokes there are variables that make estimating life uncertain: If the jetting is too lean or oil ratio isn't right or the bike is constantly decelerated with the throttle closed thumper style, all bets are off.

[rdelavega]

Asking the experts here. How many hours should a YZ 250 top end last? I know it varies per rider and how it's ridden but let's just say a fast young intermediate. How often should it be changed before we should expect it to go kaboom?

When my son was racing for our YZ144 we usually changed the piston/rings out at ~20 hours due to the fact that my son was always in the power band, for the YZ250 about 25 hours. Never had any piston/cylinder issues following this conservative schedule. We also use 1:1 pump/C12 or F&L SP-3 mixed 32:1 with Klotz synthetic or Yamahalube 2R. Good luck.

[Gator]

I go through 16 pint bottles of HP2 between pistons, which I guess is about 40 hours.  I have done this several times and the piston and ring always mic out just in spec still.   Air cleaner every 3 rides.