How many hours are you guys getting off your bottom ends?

So I am looking at a clean YZ 125 for 600$ and the guy says it needs new top end and sleeve in cylinder. How many hours are you guys getting on your bottom ends? Thanks.

Honestly, from my own experiences.....I've owned n raced numerous makes/sizes of 2t bikes. Have never had to do a bottom end on any till recent. These. Bikes I picked up cheap and they were not very well maintained.

I guess what I'm saying is; plan on doing a top and bottom end on any used bike. Cause you really have NO idea how many hours are it. Cheaper now rather than later. Lkke when your thrust washers/ needle bearing go and send debris up and seize your new topend. Check ojut the thread. By jammj2013, engine seizure.

Edited by argclh6670

Depends how you ride it, ive ridden mine at a moderate C class racing level and it lasted me well into my 3rd year.

Huh, let me see.....71 years times 365, times 24 hours - oh dang thats to hard to compute with my ol brain! Oh wait, you meant the YZ bottom end. As mentioned above, two many variables to give a solid number. I've only had one lower end fail and that was on my 99 after five years of racing and trail riding. I blamed it on the fact that I ran 50:1 whether racing or just trail riding; I now run Torco GP7 @ 40:1 and also tear down at around two years.

I'm a firm believer in 32:1....

About 3 years racing xc A class on my 06 125. At that point I just replace them to make me feel better. Thats running 50:1 golden spectro.

200-300 hrs depending on how hard your riding. If your racing A class I would go 125-150hrs.

Create an account or sign in to comment

You need to be a member in order to leave a comment

Create an account

Sign up for a new account in our community. It's easy!

Register a new account

Sign in

Already have an account? Sign in here.

Sign In Now

  • Similar Content

    • By faizakhtar125
      Hey guys I found a bike for a really cheap price. I figured out the total cost, and if I sell it I can make $850 in profit. It is a 2002 Yamaha YZ250F. He said the bike starts but then dies. I am not sure what the problem is. Is it needing a carburetor clean up? What would be the total cost to fix it?
    • By neonmarine
      Hey guys, 
      I've used this forum as a "guest" for awhile now and I thought I'd share my build now that it's all coming together.  The primary purpose of this project is to help me train for roadracing my 2009 R1 at lower speeds as well as giving me a cheap alternative to racing the big bike. 
      Here's what she looked like when I picked it up from a local shop.  Paid $800 cash for the bike as you see it with 17' rims, FMF pipe, EBC 250mm front rotor and clip on handle bars.

      Fits PERFECT!

      Shake down run at the Herrin Compound last summer:

      As she sits today:

    • By 125 yamaha guy
      i bought my yz125 from a dealer and they said that the clutch was broken so i bought it and it worked fine it would run move and everything and then it started to act up and now only first gear works barely though. when you put it in first it acts like its bogging down but its not and when you go into gears 2-5 it wont move i dont know whats wrong with it im assuming the clutch is slipping or something if you know please leave me a comment 
    • By Randomneewb
      Hey guys, I have a 2003 cr125 I bought a couple weeks ago and I'm having a problem with it. The spark plugs die every about 15 minutes, with hotter plugs it will last about 45 minutes. I herd that if the timing is off it can over heat the plugs and burn out the the resistor. Is there any truth to that? The reason I thinks it's not fouling is because when the plug dies it gives no spark no matter how much you clean it, And it shorts out. 
    • By fiat2nv
      Hi all, First post here. I need some help.
      Ive just bought an 05 yz 125 for a good price but it needs some work. One of the forks has some pretty severe pitting of the chrome on the stanchion towards the bottom near the brake caliper mount.
      Ive found a pair of good condition forks from an 04 yz250 for a very good price, from the research ive done its seems that both the 04 & 05 forks are 48mm but are different, with the 05 fork regarded as being better than the 04, but not as good as the 06 + sss forks.
      Im looking for the cheapest way to get me riding, Will I be able to make the 04 forks work with my 05 triple clamps, brakes, wheel, axle, spacers etc? If not does anyone know what hardware id need to make it work?
      Finally, as a last resort, does anyone know if i could swap the stanchion from the 04 fork into my 05 forks?
      Thanks, Andrew