Yamaha YZ250FX Long Haul Update | 140 Hours and Counting | Dirt Bike Test 

Most would think we're crazy for going that long on the motor, so considering the amount of hard hours on it, it is pretty minimal..

@@DirtBikeTest sure whole motor tear down is minimal

@@jamesoso259 It is, you must be new. Plenty of bikes don't make it to 50hrs without a rebuild.

@@OtisFlintnot at all baby boy been at this for 23 years. I’m not just someone who sits behind a keyboard and lets their 🥜 hang

Nice! Can i ask you how much time between your oil change?

@@pechemodedemploi5118 7:30-10 hours

@@AdamJawhary My 2015 has 80 hours on the stock engine and still runs great. Used mostly for trail riding. As long as you keep your air filter clean and change the oil regularly, it seems like these bikes will run for a long time. I'm thinking of doing a top end at 120 hours.

@@ridgeridermoto Thank you so much for responding, for some reason All these bike blowup videos are scaring me into thinking I'll blow my bike up at 30 hours, Have you done anything with the timing chain yet?

@@AdamJawhary I think it entirely depends on how you ride and how much maintenance you do. If you run it pinned at the track all the time it won't last nearly as long as if you trail ride. Also if you extend your service intervals it won't last as long either. I once destroyed a top end in 40 hours on my KTM because I forgot to clean the air filter for several rides. Now I clean the air filter every ride and do oil every 6 to 8 hours. Personally I have not done anything to the cam chain. The engine is completely stock at 80 hours. The bike was very clean when I bought it so it hasn't been abused, which I think is the difference between a top end lasting 30 hours and lasting 150 hours. My point is that regular and frequent service is critical for these high performance engines. As long as you're not racing your top end should last a while. When you think it's time, put in a new piston and cam chain and check valves. Like OP said, he has 200 plus hours on his engine with only one top-end rebuild. Just take good care of it and it'll take care of you

Other than it doesn't rev quite as quick and produces its power slightly lower in the RPM range, there isn't much to make it any more reliable than the F

It certainlty wouldn't hurt to pull the top end apart with that many hours

yes!

It's a 250F being raced, according to Yamaha it's supposed to be rebuilt every 12.5 hours.

We ran Maxima ProPlus+ 10w40 in this bike

We run mousse's so the extra flat protection of the 18in isn't as critical, and at the time of this video, we were racing the bike on MX type terrain so the 19 made more sense