Thanks for watching! If you are looking for a way to support the channel consider shopping for your Powersports parts at The D Zone. I also put together a list of my most commonly used tools for you guys to reference- thed.zone/product-tag/tool-collection/?count=36&orderby=popularity&ref=AP34
Seriously thank you, this video is so detailed and interesting, you did a great job at explaining everything and made it make sense 🙌🏾 appreciate you man
Thank you for putting your experience in live action. Great lessons...your intricate eye for detail and knowledge is second to none. Each ride is passion felt. 🤘
As someone who owns a CR250 '06 i can confirm this system changes the bike entirely when it comes to power but alot of people dont actually understand how to manually trigger the increase in power. By a fluke and then trial and error i worked it out :) either the bike skates or the front wheel doesnt stay on the ground XD
I might be a day late and a dollar short I am 68..I own 4 bikes all 4 strokes, but Im about to get a wr360 Husky 1995 vintage your videos will help and keep me calm thanks. Hope your doing well
Have 2 lt250r’s 87 & 88 and the range of power is way different compared to the non power valve. Having owned an 85 in the same bike really is night and day difference. Cool video bro and some cool build. God bless
Power Sports Builds installed the handguards and trail tech is next today. Then the lights and graphics, and I’m going to get a dam plate for this baby!
Mario Terminel yes finally found the parts, I spent weeks trying to find them, Kawasaki doesn’t make them and almost no 3rd parties make them either. I ended up finding some fabricators in Europe that makes the set. Even better because they are make with steel instead of aluminum so they’ll be more durable(apparently they are a common failure). Anyways can’t recommend BDX racing enough if you need the power valve parts
Bored? This is amazing. For a while, I have been brainstorming as to how to have different expansion chambers, for different RPM ranges, and what kind of valve can switch to different exhaust pipes. And also do this with multiple cylinders, like a snowmobile engine. But power valves are so much simpler. And instead of a governor, maybe I can set up quick and strong enough servo, and an Arduino to control it. ...Now the questions I have is, can a power-valve be installed into any 2-stroke, or do I have to look for powerful, multi-cylinder 2strokes, that already have that feature? And how to make a power-valve more reliable? 20 hours is ridiculous. Even with non-aggressive use? Like commuting.
I am new to bikes and just bought an 04 cr125...which I completely entirely regret. Didn’t do my research and spontaneously bought a bike from a guy who said there were 2 hours on the top end. The bike started and rose but after 2 days of sitting in my garage I went to disassemble the top end to check on it and noticed two massive gashes in the cylinder as well as the piston. I also don’t have a power valve arm. :(
@@jonmotes5406 It doesn't. Yamaha was the first motorcycle company to use a 2 stroke power valve in a motorcycle. Ski Doo (Snowmobile company) was the company to develop it for use most likely in their 2 stroke snowmobiles.
I own a 1994 Yamaha WR-250 that's been bored out to a 290 CC (2-stroke obviously). 🤘🐲😎🏍 I call her Blue like the velociraptor character from Jurassic World (it's funny because she was built 1 year after the first Jurassic Park movie came out) 🌎 💙 😂 🦖 Mine's probably one of the first bikes that has a power valve. 👍👌 Also a lot of oil spews out of the power valve port... Now I know why 😅🤣🤘 Thanks for the video mate 👍😜
"Similar" concept to Variable Valve Timing in modern car's. Less/more air/fuel based on RPM and duration of valves opening so your car doesn't idle and sound like a dragstrip car to only then run "fine" at 75 mph.
I want to hook my powervalve arm to a cable and have a lever on the bar that I actuate the powervalve with. Not because its a smart thing to do for a bike setup. Im just curious to see how it feels
I saw i guy from my school ride a yamaha yz 125 with ypvs today and holy shit it gives good bottem end power for a momet i thougt that it was i 250cc engine for a momet im a huge fan of the ypvs power valve system
Hi Adam...i havê a CRM125 from 1997. It doesn't go faster than 85/90 Km/h, about 7500rpm. I've cleand the charcoal in the exaust(about 1kg), cleandes the carburator. Seems to have comprension, stars very well, the first kick...now i have learned with about the RC valve. If it isn't that, what else should i see? Very nice video, very well explained
Good vid. I have a CR 125 1995, it idles and blips fine in neutral. But disaster on 1st ride, throttle sticking wide open even on a closed thrrootle (threw me off the back broken rear fender bent bars) Any ideas what it could be?
Awesome stuff now my question is if i want to make a handheld like a lever system to open the exhaust ports with something on a homebuilt engine to make something like a "turbo charge" =power valve?
Dt 200 have something similar that works manually with the throttle as soon as it gets to a set point, it opens the power valve dont know if its stock or aftermarket/diy job
Adam hi, I'm from Russia, I'm also assembling a 2002 honda cr125r, but I ran into a problem, I can't find the power valve on the right, you couldn't help me find it, I would buy it from you. I watched all your videos on youtube! you're doing great!
I just rebuilt the top end on my 91 cr125 as we believed our lack of competition and smoking was due to a bad piston ring ,got compression back for a few minutes then it was gone! Then found rv valve was not moving, would this cause the low compression and smoking? Any info would be appreciated very much
what does turning the screw on the outside of the cylinder do to the power valve? I was told that it can change when and how far the vale opens/closes. Is this true?
Is the power valve and the power and the same thing or is there just a band in the power valve . And do the bangs come in diff colors for did performance
Awesome info. So I have a cr125 hpp engine. I opened up the covers and its empty. This normal? And ild only have to open the clutch cover and case to install a new one? Thanks
I own Yamaha tzm and when first time riding it I almost loose my grip on throttle when reach 3k rpm(ypvs) on,man that hell fast bike Sorry my bad English
Nice video..recently got my 2006 yz 125 cylinder head replated and when i got it back all ports look rough...should i smooth all the ports before assembly?
sorry I guess I didn't pick up on the actual gear ratio between the crank speed and the "GOVERNOR" SPEED, also how much force does the Gov put on the gears to open the power valve?
pfft, i only clean it when i change pistons etc. and i only do that every couple of years. next time i think ill need a whole new cylinder too. pretty sure ive done hundreds of hours on current piston/ rings. still goes strong. but definitely looking forward to new piston/ rings etc. i only really trail/ farm ride anyway though so it doesnt bother me so much to be slightly down on power, and its too expensive and time consuming to change piston rings etc as often as recommended.. thats just extreme.
wotever99ninynine Hamilton it’s not that expensive that’s called maintenance you probably never got on the bitch anyway so it doesn’t matter when you redo the top end
i bet you could take that out and it wouldnt affect very much. a computer or brain box would be much better, thats a crude attempt to mechanically control and adjust for some slight benefit?, but again a computer would be able to pinpoint accuuracy like in a car fuel air mix etc.
3:40 this is a great vid but with al due respect that is false. its all about the change it port timing...the power valve changes when the port opens. the size increase is just a side effect and not the main objective here. 15+ years 2 stroke experience here.
Why do people bother with performance parts? If you want more power you would think the person would have just bought a much larger displacement dirtbike..... Ill never understand that. There is no replacement for displacement.
@@adampaganelli4891 nevermind I see 220s can run in the 250 pro sport 250 b and 250 b limited but I wonder why he didn't just get a 250 and modify that....
Well maybe height i can ride anything but i had to buy a crf230 for the height cause the 250 is huge lol my ass is 33yrs old but only 5ft6in 🤣 but i just bought a 150rb and this thing is beast i have a few big wheel 80s but they are a tad small......
Thanks for watching! If you are looking for a way to support the channel consider shopping for your Powersports parts at The D Zone. I also put together a list of my most commonly used tools for you guys to reference-
thed.zone/product-tag/tool-collection/?count=36&orderby=popularity&ref=AP34
How do you put the powervalve together
Seriously thank you, this video is so detailed and interesting, you did a great job at explaining everything and made it make sense 🙌🏾 appreciate you man
Thank you for putting your experience in live action. Great lessons...your intricate eye for detail and knowledge is second to none. Each ride is passion felt. 🤘
As someone who owns a CR250 '06 i can confirm this system changes the bike entirely when it comes to power but alot of people dont actually understand how to manually trigger the increase in power. By a fluke and then trial and error i worked it out :) either the bike skates or the front wheel doesnt stay on the ground XD
Sounds awesome!
I might be a day late and a dollar short I am 68..I own 4 bikes all 4 strokes, but Im about to get a wr360 Husky 1995 vintage your videos will help and keep me calm thanks. Hope your doing well
wow.. I never realized exactly how the powervalve worked until now. great video thanks for the knowledge!!!!!
Have 2 lt250r’s 87 & 88 and the range of power is way different compared to the non power valve. Having owned an 85 in the same bike really is night and day difference. Cool video bro and some cool build. God bless
Excellent explanation made everything perfectly clear, thanks and looking forward to watching more of your videos.
I got that RC Valve on the supermoto!! Thanks for explaining how it works! haha Great vid man.
Yeah man remember watching you setting it up! Get those graphics on yet?
Power Sports Builds installed the handguards and trail tech is next today. Then the lights and graphics, and I’m going to get a dam plate for this baby!
Let’s go!
I dont know how old you are,but I can certainly appreciate your knowledge!
Brilliant brilliant video, makes so much sense now, thanks
Good video! I’m already waiting for the next one so i can maintain mine before race season start
Awesome dude!
I love that you showed the kdx220. I’m here because I’m having issues on my 94 kdx 200 power valve. Great video!
Dustin Silva did you ever fixed the power valve? I just bought one and the power valve doesn’t move
Mario Terminel yes finally found the parts, I spent weeks trying to find them, Kawasaki doesn’t make them and almost no 3rd parties make them either. I ended up finding some fabricators in Europe that makes the set. Even better because they are make with steel instead of aluminum so they’ll be more durable(apparently they are a common failure). Anyways can’t recommend BDX racing enough if you need the power valve parts
Dustin Silva thanks for the info I’ll look other places online and I hope I find them!!!
Bored? This is amazing.
For a while, I have been brainstorming as to how to have different expansion chambers, for different RPM ranges, and what kind of valve can switch to different exhaust pipes. And also do this with multiple cylinders, like a snowmobile engine.
But power valves are so much simpler.
And instead of a governor, maybe I can set up quick and strong enough servo, and an Arduino to control it.
...Now the questions I have is, can a power-valve be installed into any 2-stroke, or do I have to look for powerful, multi-cylinder 2strokes, that already have that feature?
And how to make a power-valve more reliable?
20 hours is ridiculous. Even with non-aggressive use? Like commuting.
In my husqvarna 125 wre 1999 its controlled by a servo and a controller that reads the rpm from the cdi
Thanks! Easy way to understand "What and Why"
On my Yamaha DT125R (1998) The design is a lot different internally and also electronically controlled by a solenoid
I have the same bike! 98 blue
Man are these things ever different from 4-strokes.
I have the same kdx. Would appreciate if you made some detailed rebuild videos on the engine!
Nice video, great explanation 👍🏻
On the kawasaki the shaft part at about 255 in the video is that shaft spring loaded that goes in to lower block
I love your video bro. Thanks!!!
good explanation
I am new to bikes and just bought an 04 cr125...which I completely entirely regret. Didn’t do my research and spontaneously bought a bike from a guy who said there were 2 hours on the top end. The bike started and rose but after 2 days of sitting in my garage I went to disassemble the top end to check on it and noticed two massive gashes in the cylinder as well as the piston. I also don’t have a power valve arm. :(
Sorry to hear that man
Of Course you dont have a Powervalve Arm on your '04 CR125 they Used the Same Electronic RC Valve that the CR250 Uses !
Thanks for making the video. Educational
Amazing video you are so good at explaining
Thank you, very good explanation.
Yamaha was the first bikes to do power valves but skidoo was actually the ones who created and first to use it in a 2 stroke
That’s interesting!
That statement contradicts itself. Can you clarify.
@@jonmotes5406 It doesn't. Yamaha was the first motorcycle company to use a 2 stroke power valve in a motorcycle. Ski Doo (Snowmobile company) was the company to develop it for use most likely in their 2 stroke snowmobiles.
I own a 1994 Yamaha WR-250 that's been bored out to a 290 CC (2-stroke obviously). 🤘🐲😎🏍 I call her Blue like the velociraptor character from Jurassic World (it's funny because she was built 1 year after the first Jurassic Park movie came out) 🌎 💙 😂 🦖 Mine's probably one of the first bikes that has a power valve. 👍👌 Also a lot of oil spews out of the power valve port... Now I know why 😅🤣🤘 Thanks for the video mate 👍😜
Damn you explained that so well…..
Great video
"Similar" concept to Variable Valve Timing in modern car's. Less/more air/fuel based on RPM and duration of valves opening so your car doesn't idle and sound like a dragstrip car to only then run "fine" at 75 mph.
Excellent
Good job
Great video mate, can you show how the power valve sits, im worried I’ve put the governor arm in wrong cheers
I think I might’ve in my last video, have you watched the engine build series?
I want to hook my powervalve arm to a cable and have a lever on the bar that I actuate the powervalve with. Not because its a smart thing to do for a bike setup. Im just curious to see how it feels
Science Militia1 that’d be pretty cool
@Anas Mhz It wont break anything. Just will change the amount of air that the engine can flow
Good video I learned a lot
Awsome video!!!!!!!!
Thank you Marley!
I saw i guy from my school ride a yamaha yz 125 with ypvs today and holy shit it gives good bottem end power for a momet i thougt that it was i 250cc engine for a momet im a huge fan of the ypvs power valve system
Yamaha WR155 use VVA (variable valve actuator) like sohc vtec in Honda
Great video, are you uploading how to clean the power valves soon? Need to do this on my yz125
In my video on everything you need to know about a two stroke top end I cover this.
Nice, cool
hey great video man !!
cool vid
same as my bike right now 50cc 2 stroke it went from a knocking too this same noise!
Hi Adam...i havê a CRM125 from 1997. It doesn't go faster than 85/90 Km/h, about 7500rpm. I've cleand the charcoal in the exaust(about 1kg), cleandes the carburator. Seems to have comprension, stars very well, the first kick...now i have learned with about the RC valve. If it isn't that, what else should i see?
Very nice video, very well explained
whats a crm125? ive never heard of it... is it a 2 stroke 125 road bike? my cr125 dirtbike tops out at about 90kmph, normal for a dirtbike at least.
Paulo Estêvão have you tried jetting
What power valve modifications are needed for a big bore cr250 to 300?
great presentation, i get it.
Good vid. I have a CR 125 1995, it idles and blips fine in neutral. But disaster on 1st ride, throttle sticking wide open even on a closed thrrootle (threw me off the back broken rear fender bent bars) Any ideas what it could be?
Awesome stuff now my question is if i want to make a handheld like a lever system to open the exhaust ports with something on a homebuilt engine to make something like a "turbo charge" =power valve?
Dt 200 have something similar that works manually with the throttle as soon as it gets to a set point, it opens the power valve dont know if its stock or aftermarket/diy job
Hi Adam, im rebuilding the same bike as yours. Just a quick question, at a low rpm, the linkage arm should be at Down position or Up position?
KTm makes the best 2 strokes! Have a EXC300 and it rips
I am putting everything back together after changing my water pump parts, what position should my power valve be in when I am putting it back together
Get a maintenance manual for your particular bike!!!!!!!
Very informative wanna see moreeeee (:
Thanks man, more to come! I will be posting another video on two stroke engines soon. I already have a few up on the channel as wel!
@@adampaganelli4891 Thank you!! i'll check them out
Thanks Great Video!
excelente video
Thank you!
Adam hi, I'm from Russia, I'm also assembling a 2002 honda cr125r, but I ran into a problem, I can't find the power valve on the right, you couldn't help me find it, I would buy it from you. I watched all your videos on youtube! you're doing great!
Wondering about power valve timing, I have a 2000 kx250 and was wondering if I could change the timing of the valve to get more bottom end power.
I just rebuilt the top end on my 91 cr125 as we believed our lack of competition and smoking was due to a bad piston ring ,got compression back for a few minutes then it was gone! Then found rv valve was not moving, would this cause the low compression and smoking? Any info would be appreciated very much
what does turning the screw on the outside of the cylinder do to the power valve? I was told that it can change when and how far the vale opens/closes. Is this true?
Hi mate so basically a non power valve bike compensates power valve operation with exhaust shape and size, yes?
Is the power valve and the power and the same thing or is there just a band in the power valve . And do the bangs come in diff colors for did performance
Awesome info.
So I have a cr125 hpp engine.
I opened up the covers and its empty. This normal? And ild only have to open the clutch cover and case to install a new one? Thanks
I know this sounds drafted to me but don’t one Ktm port closes of for higher revs ,
I own Yamaha tzm and when first time riding it I almost loose my grip on throttle when reach 3k rpm(ypvs) on,man that hell fast bike
Sorry my bad English
Nice video..recently got my 2006 yz 125 cylinder head replated and when i got it back all ports look rough...should i smooth all the ports before assembly?
Polish the exhaust. The intake should be rough to help break up the atoms in the fuel or something like that
sorry I guess I didn't pick up on the actual gear ratio between the crank speed and the "GOVERNOR" SPEED, also how much force does the Gov put on the gears to open the power valve?
I have a Honda mtx 125 with the atac system, I need to fix it, or can I somehow remove it??
pfft, i only clean it when i change pistons etc. and i only do that every couple of years. next time i think ill need a whole new cylinder too. pretty sure ive done hundreds of hours on current piston/ rings. still goes strong. but definitely looking forward to new piston/ rings etc. i only really trail/ farm ride anyway though so it doesnt bother me so much to be slightly down on power, and its too expensive and time consuming to change piston rings etc as often as recommended.. thats just extreme.
wotever99ninynine Hamilton it’s not that expensive that’s called maintenance you probably never got on the bitch anyway so it doesn’t matter when you redo the top end
What would you charge me to rebuild my 83 cr80r motor complete rebuild
i bet you could take that out and it wouldnt affect very much. a computer or brain box would be much better, thats a crude attempt to mechanically control and adjust for some slight benefit?, but again a computer would be able to pinpoint accuuracy like in a car fuel air mix etc.
🇧🇷🇧🇷
They still run without them i had an rs125 before and i took it off all together just makes it gutless down low but she ripped in the higher rpms 😂
The manufacturers do it differently due to legal reasons period.
3:40 this is a great vid but with al due respect that is false. its all about the change it port timing...the power valve changes when the port opens. the size increase is just a side effect and not the main objective here. 15+ years 2 stroke experience here.
not like mine damit
Why do people bother with performance parts? If you want more power you would think the person would have just bought a much larger displacement dirtbike..... Ill never understand that. There is no replacement for displacement.
Racing classes restrict you on engine size....
@@adampaganelli4891 I didn't know 220cc bikes had a class, what do they race with the 250s and 450 four strokes?
@@adampaganelli4891 nevermind I see 220s can run in the 250 pro sport 250 b and 250 b limited but I wonder why he didn't just get a 250 and modify that....
@@cjw.6310 more engine rotating mass equals worse handling. Bigger engine means heavier which means worse handling
Well maybe height i can ride anything but i had to buy a crf230 for the height cause the 250 is huge lol my ass is 33yrs old but only 5ft6in 🤣 but i just bought a 150rb and this thing is beast i have a few big wheel 80s but they are a tad small......
Im cringing. It would be a great idea if you bothered to actually clean the bike before you take it apart. DOWNVOTED
Great video