I don't even have a 4 stroke let alone a yamaha but i find these videos interesting..

Heres a shortcut , leave the throttle body , throttle cables , airbox on , you can disconnect the intake side from the black rubber block that attaches to the head , just 2 allen key bolts , there is enough flex in the intake boot to push it out the way and slide the head up.

Fantastic video! I have had a few "bad" experiences as a teenager trying to do mechanical work on my mc and decided that "this is not for me". Now, 40-years later there is something called "youtube" and I have decided that I'm gonna learn how to do this! I have seen other videos and reflected on the dirt and dust on the frame above an open motor and wondered... Thanks for straightening that out! :)

This video is awesome! Literally everything I was looking for in a comprehensive and detailed video. Great work RM!

I love this website and this channel. So many great things!!!!!

great job, I'm sure it applies to the Wr250f as well

Everyone I recommend shoving a rag into were the timing chain is while taking it apart so you don't drop a screw or a pin or anything into the bottom end if you do your going to hate life

Got any tips on how to rebuild a collar bone in less than 5 weeks?

Nice vid!👍 keep the m coming

Good idea using Pro-x parts, made in Japan with high quality metals. Some of the other ones are mediocre but the other brands cranks blow absolute ass.

Good

Awesome vid and edits and filming and bike

Why I love two stroke smoke

Yeah think imma just take it to the shop

How many hours were actually on the bike? And whatvyear was it specifically

Hey don't know what top end kit based on piston size. how do you measure that? It says bore is 77 x 53 so do I order a 77 size kit?

Doing a top end rebuild on my 2017 Yz250f right now! Bike startled rattling so I shut it off checked chain and for any other loose parts didn't find any and then it wouldn't restart.. Wish me luck hoping for no major engine damage!!

How many piston rings come on a top end rebuild kit I only received four, but the manual shows five am I missing something here

Disconnect the battery first for e-start bikes.

Is it fine to only redo a piston on rings?