1:11 

Thanks!!! Thats awesome to hear! So happy to hear these are helping!

Thanks!

Ahh thanks man! I will! I do have it planned to do more of these. Hopefully real soon here, as soon as they come in!

Ohh yeah! She sounds so good. I was surprised. Made me wanna go ride her lol

LoL, He comes to help me to learn to always keep my eyes open ;p;

Right on. I received my Stuck Nutz package this weekend with decals and all. pretty cool. Looking forward to showing that off! The simple things often make me happy lol

Thanks brother! I sure will!

Oh yeah, he surely come in to test me lol.

Thanks brother! I had a 15 YZ450f and now I wish I didnt sell it lol. I wasnt riding it much compared to my 250 and 125 but now I would like to have her around. Check your fuel pressure, see if it holds well between kicks.

Yes Sir!

Thanks!

Thanks!

Thank you sir! Appreciate ya!

Thanks David! I appreciate you reaching out. Your comment put a smile on my face on this Easter morning. Thanks and hope your having a great Easter!

Thanks!

@@UpAllNight91 what state are you in btw? Oh and the chickens coming in to check on you and making sure you're doing a good job Also kills me lollll if they don't do the kakadoodledoo then it's not approved lollll

@@ronmor8237 LoL, yeah they surely make their rounds lol. Love them little guys. I'm in Parrish Florida.

Thanks, will do my best!

Hello. Thanks for the suggestion. I probably wont be able to do this comparison because I currently only own 2 strokes myself. But I can tell you stainless steel valves are heavier and require higher tension valve springs to keep them from floating. The stronger higher tension valve springs put more stress on the timing chain, guides, and also valve seats. I personally suggest sticking with the titanium valves on these high revving motors.

Thanks!

🤣🤣🤣 I have told my dentist "I do the same thing you do, work in tight spots with little tools and cant make a mistake, except its a machine and not a human" But it does kinda feel the same

For sure they are different looking. I already installed the 4X and about to load the bike up and get it ready for tomorrow. Hoping the track dries up enough by tomorrow for a good review!

Yes Sir!

@@UpAllNight91 I really love these videos along with the race videos

@@RugsadventuresThanks! I have the Vforce4X review in the works. That will be done at the track with lots of go pro coverage. Hoping to do that tomorrow!

For sure about the same concept. Its like once you learn to work on one you will have the ability to figure out the other ones too.

Right on! Thats good news!

Right.

I have used the kick start lever to test pumps but its a real pain lol. In the video linked in the description of this video I show the pump being powered by a motorcycle battery on the bench to test it. You can use a motorcycle battery, car battery, any 12v battery to test the pump and is what I do.

Right! I do know most of these do that. But this one wasn't doing that for some reason. If you notice on the first start up when I blipped the throttle twice it didn't. Not sure why this bike doesn't but you are right most YZ250f's a quick blip pops the knob back out.

For sure!!!

Hello. Thanks! I'm in Parrish which is between Tampa and Sarasota. You can reach me at upallnight91@hotmail.com if I'm not too far of a drive for you.

Hello. Yes please send some pics to upallnight91@hotmail.com

Hello.Your welcome and thanks! With nickel plated cylinders Its easy to see if a cylinder is worn and needs to be replated or replaced without having to take a measurement. I actually have a few videos on these things that you might find interesting and helpful. Here are a few links... Cylinders ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-AoQ4_aqVjto.htmlsi=4STePixqZhOs9Qa0 Pistons ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-sAeSBuNQILY.htmlsi=vtBH6lK4BnGKgxH4 Piston rings end gaps ru-vid.com/video/%D0%B2%D0%B8%D0%B4%D0%B5%D0%BE-5wdMNpgAAYo.htmlsi=BeO2gbibYTLE7IDC

Hello and your welcome. I imagine it would if I worked at it long enough. I try to only lap it long enough to get a seal again. Typically I don't have to lap them and I try to avoid doing it unless its absolutely needed which is rarely but it does happen.Another viewer suggested the idea of using a new value for lapping only and then installing a new valve that wasn't used for the lapping, while that can be expensive that is a good option if extensive lapping is required. Yamaha manual doesn't state to use a new or old valve, they only say not to lap the new valve that will be used. With steal valves, it doesn't hurt to use the new steal valve but I think I would still try to use the old valve first if it only needs a quick easy lapping. But if its way out of wack and needs extensive lapping then a new valve is probably best.

Hello. As long as the head doesnt have a ton of hours on it (like well over 200) and a valve hasnt contacted the piston then the valve guides will still be good to reuse with new valves. Honestly when it comes time to replace valve guides its almost better to just replace the whole head. The guides they sell are oversized and need machining of the head to get in the head. And then its gotta be straight in or it will also need the valve seat worked too. It better be a dam good machine shop (which is far and few between). Its better and almost cheaper to just buy a new head when that day comes. Anyway. You should be good to reuse your current head and valve guides. For the sealing, if yours is only getting a little wet after a while it will be good. It will have enough compression to start up and any imperfections that lapping would have corrected will happen on its own as the motor runs and the valve and seat get worked into each other. You should be good.

@@UpAllNight91 Thanks mate! Really appreciate your feedback. Let's see how she will run. Hopefully I would not need to comment under your another how-to change-crankshaft video:). Cheers from Switzerland.

@@samsled LoL. Right! But yeah I think you will be good. One think I should mention, if you are changing the valves and stuff because they made contact with the piston, be sure to check the rod very closely, they can get bent ever so slightly when that happens.

Next time I have a bike that needs the valves adjusted only I will cover a video with doing a valve adjustment while the head is still on. But its honestly about the same as doing it on the bench.

I know how to do it on the bike, idk how u do it on the bench. Shouldn t valve clearance be measured in TDC?

@@verarian The reason they say to put it at top dead center is to insure all the valves are fully closed and the cams lobe are not making contact with the valve cam buckers. Meaning the valve is on the base circle of the cam. You can do that on the bench by rotating the cam till the lobe of the valve is facing up and then checking the valve clearance.

@@UpAllNight91 Now it males sense to me thank you bro

Right on!

I imagine it would if I worked at it long enough. I try to only lap it long enough to get a seal again. Typically I don't have to lap them and I try to avoid doing it unless its absolutely needed which is rarely but it does happen. I do like your idea of using a new value for lapping only and then installing a new valve that wasn't used for the lapping though. Yamaha manual doesn't state to use a new or old valve, they only say not to lap the new valve that will be used.

Right on, surely the pump had issues.

Hello. Both the YZ250f and the YZ450f use 9.48mm shims. (except for the older 5 valve YZ250'f's)

To change the valves you surely need to remove the head and install with a new head gasket.

Yes going to replace the head gasket but not going to remove the cylinder or piston, should I replace cylinder gasket or be ok since on taking off cylinder?

@@clayhinkle7664 Well yes its wise to change the cylinder base gasket when you remove the head. Which makes it even wiser to replace the piston because your removing the cylinder. For me if the heads coming off, I do the piston and base gasket as well. Sometimes the rings don't seat as well then the cylinder is removed and put back on a used piston and rings so this is why its best to just toss a new piston in while your in there. You could just buy new rings but keep in mind rings need to seal on not only the cylinder walls but also the piston. So a whole knew piston and rings is best

Found the sensor unplugged. Unbelievable 😄

@@lawrencecorbo6586 Ahh hah! Good job finding it!

Right on!

I like the YZ250f. But I also like the YZ250 smoker. If I could have the YZ250F frame and the YZ250 smokers motor I would say its perfect lol.

The TPS adjustment is very sensitive and people would surely fool with them way sooner than ever needed when looking for running issues. It surely keeps the average guy out.

Sounds like valves. Low comp but will start fine once its warm. That tells me its the valves. A quick way to check is to remove the valve cover and check the intake valve clearance.

I originally took it all apart as I assumed it was the piston but the piston looks like its recently been changed by the previous owner and the piston ring gap is measuring at 0.25mm which is in spec according to manual. I have checked the intake valve clearance and can't fit a feeler guage under at all so does that mean it is the valves at fault and piston is okay? Thanks

Yes sir. Will need new valves just like the bike in this video.

The video should walk you right through the job. Follow it step by step and you should be good

Thank you 😄 you've gained a sub

Very similar jobs for sure. Some different torque specs so make sure you have the manual for that. And little difference removing the air box but otherwise about the same.

Thank you for the information

@@calvinrasmussen08rasmussen66 Yes sir!

I agree. The good news is this timing chain doesn't show any stretch or wear so he may be ok but if it was my bike I would have surely done the chain too.

Hello. In most cases like on automobiles and such with steal valves I agree. However these motors are different. In the Yamaha service manual it says " This model uses titanium intake and exhaust valves. Do not use the valves used for lapping the valve seat. Always replace valves for lapping with new valves"... In a previous video I showed how a brand new head with brand new valves does not need any lapping at all to seal up and work well. From the factory these heads and valves are machined with such tight tolerances that they don't even lap them during assembly. If you lap a new titanium valve you will wear into the first layer of the valve that is needed for the valve to have a long life. Since a new valve will seal with a new head perfectly its not the new valve that needs correction in this case but the old head that may new correction for the new valve. The mild lapping done in this video using the old valve was just to clean up any imperfections of the used heads valve seat so the new valve can seat on it squarely again. I know it sounds strange and goes against conventional thought.

Hello. Its clutch chatter. These YZ's are known to be loud with clutch chatter even new. And its kinda hit and miss, one will be loud the other not so much. If it worries you it doesnt hurt to pull the clutch cover and check everything out. If all looks good, then just button it up and at least you know.

@UpAllNight91 ok thank u

@@UpAllNight91 I done that the plates looked fried hopefully it stops it

@@IvyWilson-vt3qf New plates can surely tame it down some.

@UpAllNight91 yea just order some il let u no how it goes

Right on

I just got at least a couple of thousand dollars worth technical education just watching this video, not counting just save a couple of years of training to “see” what to check, in a bike with a failure. Thanks a lot man!

@@robertovr9976 Your welcome! 😉

No that is not normal. Sounds like its been detonating.

@@UpAllNight91 I’ll add u on Facebook can I send u pic?

@@UpAllNight91 from my understanding detonating is when the engine is running so hot that it constantly combusts so couldn’t it be from a to hot spark plug?

@@UpAllNight91 and what does a cold burn pattern look like and a hot burn paternc

@@user-ue3ku6qb3j Too hot or a hot spot or just too low of octane, or even just old gas. So many things can cause it. But it looks like octane is your issue. What octane are you using?

The kick start bikes are hard to hear the fuel.pump because they don't get much power while kicking. For them its best to just run 12 volts directly to them to test them

@@UpAllNight91 Thank you .

I have an issue with my CRF 450, I have a good spark, good valve clearance IN and EX , the fuel pump works but maybe not so well, I'm waiting for the pressure fuel tool but she's running... I have changed the fuel filter , clean the tank and she won't start since. T don't know what to do.

@UpAllNight91 Do you have an idea ? or Beavis may be ? 🤣

So she was running. You changed the filter and stuff and now she won't start?

Oh yeah!!! Ding Ding Ding, thats what caused the issues.

Honestly dont know what it stand for.

@@UpAllNight91 im guessing its that. a lot of tools like spanners/wrenches are made from chrome vanadium steel

@@falcorcrow Thats true

@@UpAllNight91 thank you for the videos! most informative I've found so far

@@falcorcrow Ahh thanks!

😅👍

LoL. Did you hear the bike run at the end. This one sounds sweet for some reason. Has a strong sharp bark when the throttle is blipped and runs so clean. Was 2020 different than the 22 and newer or something? Or maybe someones tossed a map in this one?

2021-2024 is the new higher revving motor. That one (2020) is said to have more bottom although they say the 21 plus still is class leading in bottom end...so it only gets worse @@UpAllNight91

@@keithalexander36Yup, surely a smooth but snappy motor

This is a fuel injected bike.

It doesn't matter when its a very small seat cleanup. I'm not doing it long enough to remove much of any material. Just a quick clean up. Got a question, do you ever have anything positive to say? Are you a negative Nancy?

On this 2020 you push in the knob for the high idle choke. I verified this by also feeling the throttle as the button is pressed in, I can feel it also crack into the throttle a little as the button is pressed in. To release it, usually a quick blip undoes it like you mentioned however this bike I'm finding i have to give it like 1/4 throttle and then let go for it to undo the high idle choke. Probably just a little stiff from sitting i imagine but it does seem to be working if 1/4 throttle and then dropping the throttle

Yeah crazy. Never seen that before much til maybe the last 5 years or so

Im sorry. I'm lost? I pulled this head because the valves needed to be replaced. Is that what you was talking about?

Thats right sir! Thats right