Now that I know this a small part of my soul disappears on every cold start. 😢 Great video.

Excellent demonstration, and a cool jig to show the concept!

Great explanation! I like it when people know what they are talking about and take time to explain what’s going on. These younger guys I talk with have no idea. When I explained I lap in my new valves they were blown away.

Effort and explanation is splendid. Thank you

Very good explanation, thanks!

Really good demonstration, thank you!

the only thing I could find to learn about Loosen valves. thank you

This was such a clear video. Thank you!

Great model and great teaching. Thank you

Simply beautiful! Thank you

Thank you. You are a good teacher !

Great explanations thank you

thank you very much you! great video again!

TI SEGUO DALL'ITALIA CON LA TRADUZIONE AUTOMATICA, SEI MOLTO BRAVO!

Perfect demonstation

thank you , thank you , thank you so much for this video. really liked the demo. i was hoping valve clearance degradation was friction related. this really sucks because i put 5k miles on my bike every 3 months

Awesome info!!! Thx for taking the time and effort to build the model for illustration. I never really understood exactly how it all works but i do now. Keep up the great work and vids coming. Merry Christmas

@vegasromaniac

5 жыл бұрын

Thaks for watching.. And merry Christmas

Great explanation thanks bro

Man! That’s an awesome video. Made it crystal clear and the best explanation I have seen of vlave clearances. Thank you!

@vegasromaniac

Жыл бұрын

Thanks for watching man

Excellent model made easy to understand

dear sir you have explained it very well thanks a lot

Wow.... very well explained

I love your simple model there ... explains things (perhaps better than any complicated CGI) and certainly took less time to make than a graphic Top Points

Great thanks!

Excellent explanations sir

That’s was sooooo satisfying thank you

@vegasromaniac

3 жыл бұрын

Thanks for watching

Perfect.!!!! It's like i'm inside the mind of the engine. Thank you very much for taking the effort.

@vegasromaniac

2 жыл бұрын

Glad you liked it

very nice i would say that over rev create valve float and it also creates problems in racing it’s common(giving a fistful of throttle to get the front end up mid air)keep it up man great content 😀

"That's dumb. Why don't they make it with no/less clearance?" Is the number one question I get from customers when I explain noises or issues like this. "#1 BECAUSE HEAT CAUSES METALS TO EXPAND! & #2 Because someone had to assemble it!" Are some of the replies I want to scream. But I have a filter. So what I say is "everything made of parts has to have some clearance. Machines and their parts work under extreme conditions so clearance has to be engineered in. Different materials expand and contract differently. That has to be considered. Valves and pistons are examples of parts that have to have an airtight seal under a large range of pressures and at high temps. Imagine trying to create an airtight seal with no plastics or rubber, just metal to metal. Valves to valve seats, pistons to rings to cyl walls are all metal to metal clearances that must be airtight and move at extreme speeds at high temps under extreme loads. THAT'S why clearances are engineered into the design."

Keep up the good work , very educational

@vegasromaniac

2 жыл бұрын

Very happy to hear that...

Nice, functional and comprehendible.

@vegasromaniac

2 жыл бұрын

Glad you liked it

You, sir, are very smart and very appreciated

@vegasromaniac

3 жыл бұрын

Thanks

Another superb explaination. The best I've ever seen. Thank you again sir. 😎👍

@vegasromaniac

2 жыл бұрын

Happy to be of help

Thanks

Your demonstration was excellent and very helpful, it actually makes me want to do more than just change my planned oil seals but my budjet wont allow. Maybe not the high tech explanation with all sorts of special effects but clearly I was able to follow along just fine and actually pictured it in my head as you were explaining it.

@vegasromaniac

3 жыл бұрын

Glad it was helpful!

Great video, thanks

@vegasromaniac

3 жыл бұрын

Glad you liked it

Yep that's what happened to me I live in Alaska and where there is little to no snow, it's hard to resist riding a dirtbike in the cold

Best explanation 👍🏻👍🏻👍🏻

@vegasromaniac

Жыл бұрын

Glad you liked it

model is a beauty

This is very informative 💯💯

@vegasromaniac

2 жыл бұрын

Glad to hear that

Great video

@vegasromaniac

7 ай бұрын

Thanks for the visit

Awesome

Great explanation! This is dummy proof. Im gonna have to replace my. Right intake shim since it's got 0 clearance. Probably already sink into the seat crossing my fingers so it can last me some time after replacing the shim

I liked the term , " ... a thousand of a hair..." Cool clip!

@vegasromaniac

3 жыл бұрын

Haha yeah

Okay, I’ll give you a thumbs up.

Good man thanks - now I have to tackle the shim under bucket adjustment on my CB1100. I'm actually looking forward to it.

@vegasromaniac

2 жыл бұрын

not hard , once you figure out how to do it, just make sure you cover the holes with towels in case you drop something doesnt go the bottom of the motor

@gwilliamwallace

2 жыл бұрын

@@vegasromaniac Thanks again. That wooden model is extremely well done.

well done .great model.... this happens ,when oil noels block or non spreading in cam head. otherwise when cold start give some rest run for engine nearly few mutinies ... tnx

Great explanation! Your like the Bill Nye the Science Guy of motors.

@dr.hugog.hackenbush9443

5 жыл бұрын

Bill Nye is an engineer. Dolph Lundgren is more of a scientist than he is.

@azdesertdog

5 жыл бұрын

@@dr.hugog.hackenbush9443 Actually Bill Nye is a moron. I was making a joke.

Merry Christmas

Very good explanation & visual demonstration. Big 👍 677 Stay well, Joe Z

@vegasromaniac

2 жыл бұрын

Thanks for visiting

The valve stems themselves will actually stretch out slightly, which is typically greater with exhaust valves. Higher revving engines like a Ninja 250 valves will beat into the valve seats which is typically worse with intake valves as the intake valves are a little heavier over the exhaust valves, also if one neglects to adjust valve clearances it will have an effect on the ability for the valves, especially exhaust, to reject heat into it’s seats which will cause the metal material of the seat & valve to soften leading excessive valve train wear & eventually burnt valves or even “dropped” or “sucked” valves, even neglecting to change an engines oil can cause excessive valve train wear & eventually failure.

@naestrebloc9849

Жыл бұрын

Your comment is so helpful! Where in your clearance range would you prefer to be, regarding tolerance? It’s a big range. Mine is a mostly street, never pinned, never trail raced, medium rpm range KLR 650. OEM for intake is .10 to .20, exhaust is .15 to 25. I was shooting for .15 intake and .20 exhaust, but nobody talks about preference, longevity experience and why they chose that.

Thanks so much for the good explanation but Please how can I solve this problem

Love your videos! I have a question maybe you can settle? Everyone says not to lap titanium valves but two of my machines with titanium valves the manual clearly states lap with lapping compound.. Thoughts?

Your explainable was terrific. I would love to see the difference between hydrolically adjusted valves (like on the old Nighthawk) and why they all aren't made that way to avoid the work of constant adjustment.

@vegasromaniac

3 жыл бұрын

The adjusting it's a pain, Thanks for watching

@josebajonero4754

2 жыл бұрын

Late but you try to criticize the man yet you looked up the video…..

@Motive_Tube

Жыл бұрын

@@josebajonero4754 how is the OP comment reasonably interpreted as a 'criticism'? lol, it's a non-hostile expression of curiosity...numbnuts.

Very good video and explanation. For loose valves you can actually hear the clicking noise when the engine is cold before the clearance would hit the service limit. Tip: if you are checking clearances and find a valve that is close to service limit, just do the adjustment otherwise you will have to disassemble it again in 2 months for adjustment. (True story.)

@alifarrukh2690

2 жыл бұрын

May I discuss with you on WhatsApp

@finophile

Жыл бұрын

I guess, but yes and no. I can report that with my Ducati Pantah type engine that things could stay a wee bit loose and not move ... I found that by making adjustments to keep the (quite narrow) tolerances that they'd loosen up, but if I left them on the slightly loose side it was fine. Now perhaps its an aspect of the desmo system (no valve springs) that things wore less ... dunno. But I always checked at intervals and listened every startup and at lights

Is the cam offset from the bucket? I know on some systems with followers the follower will cause the valve to rotate slightly. The valve face doesn't keep landing in the same place which prevents unusual or uneven wear. It's like tightening a lug nut with a wrench as opposed to an impact wrench.

Very good brother thanks from Dhule Maharashtra India, thanks

@vegasromaniac

3 жыл бұрын

Awesome

Why u postin so damn early on Christmas Eve. Is KZread year round for you, and if it is. . . goddamn. Merry Christmas.

@vegasromaniac

5 жыл бұрын

Scheduled video... Was made a whike back

i was about to do oil pan heater for my ktm 690 but idk how to attach it under the engine :D

great

@vegasromaniac

3 жыл бұрын

Awesome

1 other problem sometimes is the vavle stems themselves can stretch, due to the vavle face slamming hard into the valve seat from being pulled closed so hard by the heavy vavle springs, especially if they have been replaced by heavier spec springs than factory. Over time this can eventually have the effect of making the overall length of the valves longer, which of course can also interfere with the cold & hot clearances, etc..

@vegasromaniac

3 жыл бұрын

I've never seen one stra stretched, only worn on the lip

Do you know why my klr650 makes a valve ticking noise after the engine is warmed up? previously the valve shims were out of spec (too tight) - now within spec still on the tighter side but making ticking noise when the engines hot

the main reason why valve clearance change is because of a lack of oil lubrication. Valve assemblies for engines should never fail or lose clearance hardly at all over a very long period of time. However, if there is a oil problem...or lack of lubrication...even the best engineered valve assemblies will fail and lose clearance..and of course, if not solved quickly, can lead to catastrophic engine failure. for instance..the reason why mower engine manufactures recommend that valve clearance is checked and regapped as necessary at the 300 hour mark is not really about material ablation of the valve assemblies, but rather that new engines will at around the 300 hour mark experience at least 5-10 oil changes. It is those oil changes (or lack thereof), that are usually going to produce some material loss (ablation). And at the same 300 hour schedule, manufacturers of these mower engines (air cooled 4 stroke), valves should be lapped. Again, not because of valve seat ablation, but due to heat related problems that happen over time: soot and unburned fuel/exhaust that cakes into the seat! So you are not really doing a metal lapping, but rather just removing soot ..carbon from the seat. (and I would recommend removing the carbon from the piston as well as from the valves and combustion chamber in the head cylinder...and inspecting the cylinder bore for any damage). at 300 hours is where more heat related problems and soot related issues happen. This is why the manuals recommend doing that maintenance. it has very little to do with loss of material in the valve assemblies. I mean it can happen, but material failure/ablation of this type would be related to a lack of proper heat management and lubrication from not changing your oil and filter per schedule...or running the engine really really really hard on very hot days...or worse...running a very hot engine in the middle of a cold rain shower...or even worse, "cleaning" an engine with cold water while the engine is very hot. These are things that can warp head cylinders, cause extreme changes to material expansion and contraction. And that can seriously alter how the valve assemblies absorb that kind of "shock".

@vegasromaniac

Жыл бұрын

All good info

I disassymble may head last time. May valve have a leak but i dont have a grinding compound and is may intake valve is sharp but may exshaust valve i still ok but it have a leak need to use a grinding compound and my bike have a hard start an the 1st start it have a lil knocking sound and it will die but when my motor is hot is easy start

I just had a valve adjustment done by the dealer. The bike is louder and almost sounds like a small diesel. Is that normal...And were the valves opened to the max spec? Thx

Can valves out of spec cause rough idling? My rpm needle dances after the first morning start. Then the dancing lowers but it still dances all the time and the engine has a tendency to shut down on stop and go traffic or at traffic lights.

4th reason. Valves can tulip. Which makes them longer. Some people may call that stretching. So if someone say they stretched they might not be wrong.

I think you will find the whole valve action to the cam is a lot more controlled that what your explaining , as cams have flanks prior to the valve lift , also specific spring pressure to suit cam type , but seats do wear due to unleaded fuel , and lifters wear , no ZDDP , etc etc .

i got a 300$ xr200r that the last owner dident use a air filter, had a streched sock as one and the intake valve is very worn and piston rings are toast smokes up a storm, still starts first kick and has alot of compresion and runs good just very smoky lol, im going to rebuild it soon i ran it like this for 6 years just add oil every time i ride it. i just got a 2006 yz 250f that runs great i had to adjust the carb thats it, they built the engine high compression CP piston, web cam, lex exaust, they made the carb way to rich they raised the slider needle and went up 3 jet sizes it wold stumble at low throttle once setting the needle to stock and turning the mixture screw to 1 turn out it runs like a champ, the dyno sheet that came with it reads 39hp at the wheel, i got the receipt they spent 2600$ building it and i baught it for 2300$

Well kind of. The number one cause of valve where is dirt through a improperly oiled air filter. So valve clearance is there so that once the motor warms up there is in the naborhood of one fourth to one half of the hot Clarence this leaves enough room for the valve to fully seat and dump heat into the head and leave enough Clarence for a very thin film of oil between the Sham or the bucket and the cam itself. A tight valve can starve the cam and bucket or shim for oil and burn the valve in a multi cylinder engine. In a single it just stops running. While a loose valve can hammer on the shim end of the valve causing where. That all sed some Factory titanium valves like in the older crfs were just plain soft and wore out quickly. The thing about a properly cleaned and oiled airfilter is that it will stop running before it passes a harmful amount of dirt. Air filter maintance is key.

Absolutely amazing explanation! This explained my question to your other video. Now I have other (newbie) questions, I hope you'll have time to answer. Does all this mean that to lengthen the needed intervals for valve clearance and replacement I can do this: 1) Clean my air filter more often. 2) Change the engine oil more often. 3) Avoid (as much as possible) starting the motorcycle in cold weather. 4) Placing the motorcycle in the sun (to keep it warm), instead of in the shadow. 5) Letting the engine run for some minutes before I give too much gas. Am I correct or...? Thanks!

@vegasromaniac

3 ай бұрын

You are way above correct , do the first 2 and you will have the bike forever ...but what you didn't mention is check valve clearance , once they are out of spec they wear out faster ... That's what kills valves being used out of spec

@stefanhansen5882

3 ай бұрын

@@vegasromaniac Thanks a lot! If the manual says change oil every 3,000 km will it then be a lot better to do it every 1,000 km or even every 500 km-or would that not help much?

Most dirt bike motors (aluminum heads) actually have looser valves when they warm up, if you don't believe me check your valve clearance when cold and again when hot and you'll see.

@vegasromaniac

Жыл бұрын

That's true .. aluminum expands more when hot

❤

There has to be a way to eliminate this problem and keep them in spec all the time no matter what.

@vegasromaniac

3 ай бұрын

Maintenance

🤙🏽

Thanks, I didn't get why the valves where too tight on my car, now I understand. Also, could carbon deposits on the valve seats cause loose valves ? Or maybe it's not even possible in the first place ? Imagine this scenario : you adjust your valves clearances with a dirty engine (of course without knowing it), and after a while you do a cleanup with some fuel additives. Could it cause valves to be too tight afterwards, to the point of damaging the engine ?

@vegasromaniac

4 жыл бұрын

Carbon can affect it nut not that muc, h not a big problem, reduces performance slightly at the top of you red line it, nobody does that so it's just a blah blah bu people wanna sell you better fuel

@alifarrukh2690

2 жыл бұрын

Can you please discuss with me on WhatsApp

i got a question..great explanation...I am currently trying to troublehshoot an issue with my V TWIN 4 Stroke. Bike has no issues starting cold to warm. However, when up to optimal temperature, and i park up, the bike will make a noise (like piston hitting valve) and a puff of white smoke will come out on start. If i shut it off, then start it immediately after, all is well. I suspect i could have maybe a valve clearance issue but the bike works fine as well...... bike is doing 4800 miles atm.

@vegasromaniac

2 жыл бұрын

Man that's a tough one, if the piston eve. Touched the valve, Than bye bye motor so its not that, it won't start if it would be that.... Maybe the timing chain it's slapping, the smoke part it's strange... I can't say where is that coming from, only oil and coolant make the bike smoke...

How often do you replace the timing chain on your fx

The bucket should never ride the cam while in the closed position. The valve closes on the valve face and seat.

Fuckin awesome explanation 👏 👌 😁😁

Hey man, I mixed up my valves but they seat fine on the exhaust side. I've read this won't be an issue but you think it's okay? I remember checking valve length once with a caliper and they seemed to be all the same size. thanks.

@vegasromaniac

2 жыл бұрын

You will only know if it's ok will be fine or go bang

@happypanda8320

2 жыл бұрын

@@vegasromaniac lol what

If my valve 3 exhaust valves are tight will that stop my yfz450 from starting there way out of spec

@vegasromaniac

5 жыл бұрын

Yes you can't create compression

Good video and explanation. I have had a exhaust valve that could not get a 0.03 feeler gauge in. So i have adjusted it to intake 0.04. And exhaust at 0.05. As it was not working or starting i had it started and it just cut out and would not start 😮

So even with the most diligent maintenance your piston will get loose. How many hours do they last typically.

@vegasromaniac

5 жыл бұрын

I don't know but planning to change mine about 2 hours beofore it blows

Hi brother, are you aware of a case where valves getting tighter, and the motorcycle not starting when left in the sun.?? I have been noticing that my bike takes too many cranks to fire up, whenever i try to start after leaving it under hot sun. Haven't experienced this in other circumstances. I was told by my service technician that it is due to valves getting tight. I am like clueless on the subject. Do you think you can help me out?? Thanks in advance.

@vegasromaniac

4 жыл бұрын

Never noticed that

You’re wrong, the spring keeps the bucket in contact with the cam over most of the cam revolution, it’s only around TDC that a valve gap appears due to the valve seating in the valve seat. What you are describing is effectively valve bounce where the valve spring can’t work fast enough to follow the cam profile. That only occurs a very high rpm.

So are you saying I shouldnt ride my ride my dirt bike in the winter? Or are you saying to make sure it is warmed up before I ride? You said both and i'm confused

@vegasromaniac

5 жыл бұрын

Keep it in the garage, the warmer the better and don't start it unless you ride it..

@zechb756

5 жыл бұрын

@@vegasromaniac Thank you for responding! I Live in PA its in the 30's here. I just got a new 2018 CRF and plan on riding it but wanted to make sure what you thought. So as long as i ride it and not just start it and keep it at a idle i'll be safe? .......Merry Christmas!! Please keep your videos coming. I check everyday

can one tell if the VALVES are tight or get loose hearing the engine sound ???🙏

I need help. Even with the smallest shim on one of my intake valves, it still has 0 clearance... any idea

@vegasromaniac

4 жыл бұрын

That valve it's so worn it's out of spec you need a new valve, sorry but that's a fact, and I know nobody wants to hear that

@Sonnymercer2112

4 жыл бұрын

What's the chances of the valve and the valve seat in the head to been worn too?

@vegasromaniac

4 жыл бұрын

@@Sonnymercer2112 seat it's usually stronger than the valve of its titanium valve, so the seat doesn't work that easy

@Sonnymercer2112

4 жыл бұрын

@@vegasromaniac thank you brother... all the way from Cyprus 👍👌

@joverbuhok5222

4 жыл бұрын

change valve my friend

whats the solution to this problem

@vegasromaniac

7 ай бұрын

Maintenance and replacing the valves when out of spec

This is exactly what I needed to know about my bike. Quote of the day: Genius has it's limits, ignorance has no bounds. That's why I race at night.

First like

Good demo... With respect, you don't 'turn on' an engine... You 'start' an engine... You turn on an electric motor... 🙏

@vegasromaniac

3 жыл бұрын

I agree, English is my second language , sometime I directly translate from romanian and out dialect it's a lot more simple...

Ah uh uuuhhh ah uh uh uh uuh uuh uh uh

I'll just change my reeds every 5 years or so.

Valves dont get loose

First

cars can go 150,000 - 200,000 miles without a required valve adjustment.......why not make MC that way ???

Awesome

@vegasromaniac

2 жыл бұрын

👍🏻

Thanks