;-)😅

Yeah, it's best to do it in your driveway early in the morning. The neighbors will love it.

@@twc9000 😎😎😎

@@twc9000 I find it to be more effective during midnight too

​@@twc9000 the neighbors wont have to put up with it for very long ...it will make the sound of the first bike in this video and then it will never run again ..

Yes, in Europe we use RON (research octane number) and in USA they use MON (motor octane number). I run my bikes with 98E5 ethanol 5% and 98 RON. Good video. I would like to add the eight reason for motor failure. Too hard reving with too cold motor. Piston will seize in the cylinder as it expands too fast and cylinder does not have time to expand so fast so the piston to cylinder clearance gets too tight.

@@jannep6772 In some locations in Europe there's actually better fuel available. Germany has Aral 102 competition (ethanol free), Holland has some locations that sell 100+ (ethanol free) fuel. Ethanol is the octane part in fuel but it tends to make the fuel burn relatively slow. Slow is a longer combustion period and that adds up to the actual heat in the engine. Better quality fuel burns quicker and therefore runs cooler. Better fuel isn't just a higher octane value. Stuff like Sunoco, ELF, VP, Panta are completely different from the stuff you get at the gas station. I think fuel quality, besides bad maintenance and bad habits, is the main reason of engine failure, you can compensate by running engines richer to keep them cool but you really want better fuel to keep the thermal drama down. Engines are running quite high rpm's and compression, there's just a really small amount of time for a combustion to happen, you don't want slow burning fuel, it runs hot. Adding 20% extra will cool it down a little but it's a bandage.

Fuckin Skallywags!

@@odyshopody9387 😂

This is very accurate 😂

@@limbo5463 🤣😂

Don't forget some of these guys like to ride crazy long wheelies starving the engine of oil mostly the four-strokes

Maybe, except, that he putted the Main Reason on only the 6'th place.

@@bustjanzupan1074 he did not tell anyone the main reason 4 stroke dirt bikes fail , simply because he does not know or even have the slightest clue .he did not even mention one reason why of the failures he has seen ! He is only a parts exchanger and not a diagnostic technician

@@bustjanzupan1074 he never mentioned the main reason all four stroke dirt bikes fail. That is the valve springs become too weak in a short time to keep the valves from contacting the piston at the extreme rpms they turn ..all so the tiny hardened steel pins that hold the stacked plates together of there hyvo style cam chains that turn extreme rpm causes the hyvo style cam chain plates to wear tiny notches on the hardened steel pins to cause just one pin out of the hundreds of them to snap into sending the cam chain through the bottom of the engine case at which time the camshaft has stopped turning with intake or exhaust lobes still holding valves wide open to come in contact with a piston that is still going up and down striking the valves 233.333~ times per second causing a domeno effect of major parts of the engine to go kafu¢ken Boooom party over time to buy a complete new engine that usually cost half the price of a new bike ...or spend a little bit more and have A.J. Waggner to shoe horn one of his BUILT CR500R or a CR538R insane strokers all billet cnc milled aluminium complete two stroke engines licensed by Honda with A.J.'s adapter kits made for each brand of 450 four stroke frames . What you end up with is a king of hill , track , and drag strip that can not fail from any problems due to all four strokes because the CR500R engine does not have any parts that fail in all the four strokes which makes the two strokes of today 100% more reliable if you know how to service and maintain a two stroke , it will live longer than you. And all the specs this joker in this video tells you about to stroke engine life is all his own made up B.S. as far as my information goes about two strokes come from a time of honda's very first two stroke that was designed by only one man who was the most world famous professional motorcycle engine designer and racing tuner of all times known world wide no other than Pops Yoshimura who designed built and raced the Honda Elsinore to several Japanese Championships and then in 1974 became the instructor at honda's R&D Training Center in Milwaukee where i became one of Yoshimura's students for around five years learning all the mods Yoshimura made to the honda Elsinore as they were developed over the following years giving me hands on knowledge of everything there is to know about all two stroke engines that i was required to know to keep my job while working at a honda franchised dealership that sponsored AMA pro motocross racing... to evolve into the CR500R that A.J. Waggner by licenses through honda for 25 years has been building two stroke engines from forged blocks of military aircraft grades of billet aluminum and using forged aircraft steel dynamically spin balanced and stuffed crankshafts and transmission gears, shifting forks , counter and main shafts, couplers and special oem machined spacers where they apply..modified billet water pumps and at request engine cases special designed to except common easy to get hydraulic clutch cylinders ..wait a second , why take my word for it who knows more than most about all two strokes , here is A.J. and his website with phone number to call and talk to the guru himself...i try to keep my comments as short as possible but as you can see i know too much and so little time ...now you know too much so if you will please show your pals your new information for in the future we can all be on the same page and ready for the next level up in two stroke tuning ..just remember two strokes by design are internally supercharged at causes their power band to make pounds of boost ...four stroke can only suck, bang, and blow (into dozens of pieces parts and parts pieces in one first and last KAFU¢KEN BOOOM) BUILT500.COM if for any reason you dont like to ride red he now builds engines in flavors of blue yellow and green as well

@@donniebaker5984 What are you on?? 😳 -NY

@@Davido50 the truth . at age 73 today i was at age 25 an apprentice of "pops" yoshimura the inventor of honda's first two stroke called the "Elsinore" ever heard of one ? i doubt it ! that was the game changer as famous as pops yoshimura rip . buzz off ass hole

very informative ? lf you didnt know that you should change the oil once in a while and clean the air filter and splash some fresh gas in the tank is all that was said and never did the video answer the main reason 4t dirt bikes blow up ,,so if you own one sooner or later its going to self detonate because you still have not been told the real reason why all 4t dirt bikes will all fail that will never happen to a two stroke simply because they do not have any of the parts all 4t dirt bike engines have that causes to fail in the first place ..since you are a millennial who always rudely interrupt their elders and try to correct as you all believe we are to old to know anything ...so i say i know exactly what will fail in all four strokes that even after the parts are changed out their will come a time where those same parts will have to be changed out again ,,and if you allow them to go on beyond and fail they will cause more damage and destruction than the cost of and complete brand new engine ..and go now and figure it all out by yourselves as i am never going to tell any millennial anything at all about everything that you have been purposely lied to about that will cause you to fu

Dude my roommate has an older like 02 Klx 300. He fires that thing up and jams out giving it zero time to warm up hahah been doing it for a year or two. I told him you’re going to seize that bitch up doing that. But it hasn’t yet it’s actually quite impressive hahaha.

Really bad thing to do🤓🤙

​@@Eddiep80he's lucky

Worst thing to do ever,man,y?😫😫😫🤯👁🙈🙈😱😮🤔😡💀💀

You guys have rev limiters?!? *sad 2 stroke noises*

Every motor I have done with titanium valves I have had to send the head out with the new valves to have the valve seats recut, from my understanding the titanium coating is on the valves. Not the seats

In my opinion,it's my opinion that's way to fast my friend believe it or not my friend had 340 hours on ktm sx85 before it blow up and my Kawasaki kx85 has like 160 hours i think and it's running fine yes maybe you don't get the same power out of it but i think 2 stroke if it's build right they can do easily 100-130 hours ,4 strokes i think easily 200 hours my friend has honda crf250 and he has like 170 hours and it still running fine it's my opinion and like honestly even if i want to change the piston every 10 hours i don't have that much money 🤣 like 10 hours thats like a week of riding and piston in my country are like 100 euros and avarge salary here is 1300 euros ,like its to much money for me to spent every week 100 euros that like 400 euros okey if i ride a little less lets say 2 pistons still 200 euros and then comes the gas and the oil and other things that breakes ,and you need to change brake pads🤯🤯,

@@gal184 Jesus Christ dude, 160 hours?? It's time for a change brother!

Well im sunday driver on enduro with 250cr from 97. Went to 40:1 and noticed incredible difference on performance from 32:1. I dont prob have to change piston every 40h🤣

Non-ethanol kills detonation resistance. I tune big turbo cars for a living, 91 non ethanol is a lot more prone to knock than 91 E10, despite the same rating. 91 E free is like 88-89 with E10.

@@OtisFlint Or the 91 e10 is 91 octane gasoline with 10% ethanol added so it actually totals 92-94octane :)

40😂😂

@@1991enduro hell yea

Why even run an airfilter, total waste! Just spray a shot of oil in the carb every now and again to collect the dirt.

@@markalan4026 more air flow! Might have to try that

Yep the quality builds , no need for cotton wool treatment .

Happy to help!

thanks dude!

does the gas degrade the foam? i know they feel weird after being in gas, but to me they always recover just fine when dry. i use gas first, fully dry them, then use the soapy water last. then fully dry. i've also always used grease at the seal. most guys don't but i cant bring myself to trust no grease.

I have 900 hrs on my WR250f and it too is 100% stock and I raced it and ride in the rocky woods on PA. Valve adjustment is key if you run them at high rpms but if you run them in the woods they just keep going...

We have your exact bike. 99 WR400F and we bought it about a year and a half ago and we bought it supposedly "perfectly fine" but after we couldn't start it we took it to a dealer and discovered the head was over-torqued. Squished the aluminum head and the owner was able to revive the head and it has been perfectly fine since. We have done the HotCams auto-decompression cam to remove the fussy decompression lever and the bike is absolutely bulletproof. I agree with you. these early 5-valve Yamaha's are indestructible. I don't even know how many hours our motor has as for it never had a rebuild (on the previous owner and us). All that was done was oil changes and an air filter. We also took off the airbox snorkel to give it extra power. It also has a cheap Chinese carb on it since the OEM carbs are really expensive but after all of that it is a tough tough TOUGH bike.

@@kmx509 Just now saw your reply to my post about my ‘99. I don’t know HOW mine has survived my abuse all these years , but it has !! All you gotta do is give ‘em a little love & attention every now & then it seems. Enjoy your bike man😎👍

@@stephenmiller5023 For sure!

Got a 1987 TRX250X, pretty sure it was never torn apart, even the tires and rims were original when I bought it off the original owner, rear end definitely got damaged cause all the missing stuff but still ran til recently

Av gas isn't that good a choice , Av gas has all kinds of additives needed for aviation use that are not good for getting maximum performance. A 50/50 mix of race gas and pump fuel is much better choice.

Replace the valve springs and cam chain with stock OEM . No aftermarket stuff...put a small piece rope in the spark plug hole with the piston up against it When intakes and exhausts are closed .this will allow you the change springs without removing the head..you can change the cam chain on the XR without removing the head or splitting the engine cases... The husaberg i know nothing about . It may have bee hive titanium valve springs that dont wear out

I do the same, I think its ok

Yes , I love 2 strokes for their simplicity and ease of maintenance. Sound great too

I think 2 strokes are more fun also because they are very light and I can wheelie on it easier cuz of the weight

@@WealthMafiiayeah i gotta 4 and 2 and the 4 is wayyyy easier to wheelie cuz as soon as u get in the powerband in a wheelie on a 2 it scares the balls outta you

Yeah mine has a knock from the play in the clutch basket bearing

​@@za5teeshftw709my 4t road bike yamaha has a clutch basket knock

You are not giving up enough information to make any kind of a judgement call on engine life ..how wide are the contact of the valve face to valve seats ? How weak have the valve springs became ? How much slop is there in the cam chain links all pushed together and them pulled apart to see the slop in distance ? Is the valve that is deeper in the head than the other 3 needing the clearance adjusted more offen losing clearance

Zero.

Compression ratio

Carbon deposits shorten engine life. Low octane in a 2t will cause more carbon deposit..when you hear an engine pinging that is spark knock ...when detonation happens you can not hear it as its canceled out by the sound of combustion.. and 2 strokes are internally super charged when they begin running in their power band ..so 93 octane gas and a shot of 106 octane booster from autozone works ...but dont spare on your two stroke oil ..mix yamalube R 100% synthetic one pint bottle to five gallons of gas

​@@OtisFlintfor you that goes for all engines just feed them what ever ..you dont have a clue

Avgas has anti freeze additives

low RPM trail riding makes it all less critical, but yeah... 30 hrs is a bit too long. just think about clutch plate and gear wear particles running through your cam bearings piston skirt... you get the picture

no, just premium.

adjust the valves every 5 years of easy riding. the engine will last forever if you do the oil and filter often and run good gas.

It depends how you ride but 100 on 250f sounds ok for weekend warriors

I'm average weekend warrior riding on passion, not skills and strength. :P Thanks for reply and greetings from Poland close neighbourhood of your origin country- Slovakia. @@dirtniron

it used to be true up until about year 2000 when all the MX bikes switched to high performance designed high revving 4 -strokes... which blow up more often than 2 strokes if they are not treated properly, as per this video.

How many hours on her

I got a 2016 kx450f with like almost 200 hours and it runs amazing im thinking about doing the piston but i dont think i have too cuz the compression still feels crazy

@@Blocanbentlyyahu dunno lost count around 400hrs. Only other bike I have from new is a 2014 yz250...love it but it cant compete on cost per hour to ride, strange given we all think it should be cheaper. Have a 03 rm250 and a klx250s. KLX just ate a cam,just got it going again ....great for night time slays in the forest with a light bar.

In a four stroke ?

I’ve stopped pump gas altogether. Ethanol is so bad for engines and seals

Consider the bhp/litre (of engine size) and the working rev range. For competition motorcycle engines it will be way higher than leaf blowers, trucks, etc. That's why they fail when they reach the end of their life or are not cared for.

@@markholland7310 the use of a weed eater and blower is wide open all the time and under a load. They are under far more use than a dirt bike. My point is no one should have to change oil every weekend of riding or even every 10 hours

modify the weed wacker engine to produce four or five times its rated power and it won't last either. It's essentially what's the dirt bike engine is. they push the technology to the absolute limit to be competitive

@@user-ih5ii4tp3w You said they push technology as far as it will go when building these bikes. There not even close. They could build them to last as long as car motor. I would say study your metals and learn about engine rebuilds. They could make a 1000hp 2 stroke if they wanted to but what’s the purpose. We are already at the edge of what a human can handle anyway

in most cases, a huge difference, yes. think of it as a farm tractor engine, vs a race car. the engines are not comparable. most quads have low revving torquey 4 strokes, while the MX type bikes all run a high RPM design that is much more demanding about perfect maintenance. most trail bikes also use the old school engines. if its a quad, you need to set the valves once a year and change oil as often as you can, but the main thing is to get the engine rebuilt when it starts using a fair bit of oil. it will be burning more oil due to cylinder and valve guide wear. so in short, quad riders can just ride and stay happy, but modern MX bikes need everything to be perfect, as this vid well states.

@@yukonjon5964 Thanks for the response!

@@martinsk8798 yep. first thing to go on a quad is the cam chain, and the cylinder wears enough that it burns a lot of oil even though it still has good compression. can burn up all the oil fast too, so gotta watch that. can normally hear the cam chain sound once the tensioner reaches its max. mainly when letting off the gas when parked.

@@yukonjon5964 Understood, will keep an eye out, for now I only did 7 hours to my quad (winter here so can’t ride much)

@@martinsk8798 yeah your safe. it takes years and years to wear quads out. i've seen guys have the hour meter show 2000 hours and no one ever touched the engine. on a Honda.

for sure rebuild it. should only need... piston/rings, valves and cam chain. only need to worry about the valve seats and the rod after about 400 hrs. but wait... did you mean a boat or a bike??? if you mean boat... wrong forum to ask.

don't quote me but i think he means... piston/rings and cam chain, plus adjust valves. replace valves after they need adjusting two or three times.

I've told sooo many of my friends about the old avgas. And yes its still leaded

@@MrSuperflydude I also used to run it in my 69 Roadrunner on Friday nights when we cruised the strip.

There's avgas with LL at the end indicating "Low Lead" but I think there are unleaded alternatives too. The lead protects the engine parts so they still use it to be extra safe with aviation :)

I always ran a 50/50 mix of AV-gas & whatever 91 octane premium fuel I could get in my Yamaha 2 strokes ( RD -400 & YZ’s ) and Never had any issues once jetted correctly . Made a huge difference out playing in sand dunes on my old Tri-Z 250 3 Wheeler too . 👍

Don't use 100LL. We don't need any more lead in the air. We need to wait for the dinosaur that is the FAA to approve unleaded recip fuels to be used.