CRF150R Engine Teardown | It's real ugly! 

Man, sorry to see that the engine blew... Keep us posted on your 2022!

I picked up an 07 crf150rb project/basket case bike a few weeks ago for $400 that was locked up. It looked almost identical to yours when I cracked it open, but the hole in the case halves on mine were a lot bigger. I bought the right case half and need to find a left one cheap now. I said screw it. I'll rebuild it.

I just got a locked up 07 150rb and started to open it up too! I was excited to see your video come up and understand why you wont be rebuilding this engine.. I was hoping for step by step rebuild video to follow though!.. ps can i have your clutch? 😉

What oil are you running? That could be why it blew up

oh man, fun video though!

Not fun but is a good time for CR125 option

conrod failures are almost always caused by pushing a steel or metal piece past its infinite fatigue limit too long, I can help boil down the cause a bit. How many hours did the bottom end/conrod have on it? what type of riding do you do with it? for your type of riding do you rev your motor high a lot? basically the thing that kills conrods is revving the engine high, not oil supply or anything like that because that kills the cylinder and bearing first so I'm sure your oil was clean enough and your oil squirter was fine. keeping the motor revs below 2/3 of the total rev range ensures that the conrod will last basically forever, at those rpm's the conrod is not under much strain and will not become weaker with time or usage but revving the motor above2/3 of the total rev range or to where it makes peak power output subjects the conrod to too much force and it becomes weaker every time it is subject to those forces. so basically im just asking for how many hours the conrod had on it and how often you revved the motor really high. based off of the teardown I can almost grantee you did rev it high a lot and that is the cause of the failures, if not then it could have been a faulty rod or it just had too many hours on it. those 150r motors try to make way too much power and need rebuilds all the time so it could have just been a high hour motor. also i would like ot know this info just for personal experience so I get a better idea of when i need to rebuild my motors.

Time to dust off the KX

Holy crap! 65 time!

Whooaa! That piston tried to reach the moon! Sorry to see this happened. Was there any warning signs?

That's a lot of damage. I wonder what was the cause of it all?

A whole new engine? Why not just buy a new crankcase and head, reuse the rest

Thats the joys of balance shaft , rod failure.. they all making cheap junk to save a dollar.. but the rev limiter heroes of today can turn everything to scrap.. if you rely on the rev limiter you seriously need to lear how to ride a bike..