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How A 2-Stroke Reed Valve Works | Fix Your Dirt Bike
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- čas přidán 10. 07. 2016
- How A 2-stroke Reed valve works. A reed valve is simply a one-way valve that lets the air/fuel mixture from the carburetor into the crankcase during vacuum.
The reed valve is easy to overlook during routine maintenance, and under-appreciated when it comes to performance, so make sure it's working right!
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Nice and straight to the point ,
Nice demo - warm friendly demeaner - thank you.
Great video with clear explanations! I plan on adding reeds to my 66/80 as a first mod
Thanks!
Ok you earned that subscription! When I seen you only have 5,000 subscription I was surprised as this video is equal quality to someone like Cameron Niemela who has 100k subscribers... Keep it up mate
Love you're channel brother, 👍👌👏 plz keep the vids flowing, I'm jus now getting back into mx again after a 15 year break
Thanks for watching!
So simple! Only ever owned 4 strokes until my kids JR50 so I'm clueless to the differences. Great vid! sub'd.
buryurfear14 Glad you liked it!
Hey I sucked in a quarter I inch square of reed vale into my right cylinder should I take the engine apart? I just notice today it wouldn’t run right took it apart and saw my reed was broken looks like fiberglass
Ooof! Ya, looks like you'll need to split the case and check everything inside.
Well done. Very nice explanation. Thanks taking the time and making the effort to develop this video.
Glad you liked it!
Alrighty man thanks for the reply I had Bowen super stock carbon reeds and they just broke not to long ago I. Going to try the fiber reeds this time around
I’ve decided to restore my an rgv250 that has sat in a barn for 30years. Tank had skanky rusted fuel in it… will talk a bit to clean. I have ordered a new fuel tap and new fuel lines, battery and new radiator hoses.
Should I replace reeds at this point?
I would replace them on principle. New carbon reeds will be far superior to stock 30 years later.
After I ride on the lake got home to do a flush, turned on and my ski started to accelerating it self high , I checked the reeds 1 is tiny broken I see light tru it and. 1 I see light tru it , also my filters are kind of wet with oil . Replace reeds?
Oh yeah
Hi, i have a old Stihl weed whacker "no Reed valves" and after replacing all the seals ect for the "vacuum" section, it still wont work right as skirt to bore clearance which is supposed to me Max .152 mm is more than that. So this loose fit not only dont provide enough suction build up but also the sliding skirt past the inlet port not seal well like a reed valve would and the port and pulse line be almost zero as it seems to be when i test it?
Will work reeds also cause a flooding problem. I will start my bike and it will die shortly after. Let it sit for a little while and it starts back up then dies again. Pulled my feeds off and saw light in the corners of the right flaps. Also saw some excess gas sitting at the bottom of the reeds on the crank case.
Great down and dirty well executed video
awesome video dude, subscribed for more of this!
Thank bro
Love the doc brown reference
good demonstration
thanks, simple, clear and informative ;).
Thanks .......and Well done
thank fking god I found your channel, I can finally fix my damn scooter. greeting from germany!
Awesome video man. Thank you
Can a bad read keep you from getting fuel from the fuel tank
Hi John! I hope,you are well man. I am getting a slight over rev on my RM 125 and I am wondering if it could be the carb or the reeds ? It’s not terrible but it is irritating because it leads me to come into corners a bit hot even if I tap off early. The carb is jetted well so I am not too sure what it could be ? Maybe the needle needs to be adjusted ?
Hey John cool video. I have a 1998 cr250 and one of my reed petals broke and is possibly in my cylinder, what should I do? Thanks
Oh damn dude! Looks like you need to pull the top end and see if you can fish it out of the crankcase. If you need any help you can always message me on FB. Let me know how it goes!
@@Fixyourdirtbike thanks man, I appreciate your help and support, your videos are always great. Have a great day an keep on rippin
Thanks for making this. One day my scooter just died all of a sudden. When I cranked the engine, it seemed like it cranked faster than usual, which made me believe it lost compression. Is it possible the reed valve just broke?
If your valve broke you would definitely know. Reed valves usually wear out over time. I'd still check them though!
i have yamaha rx135 plz tell me upper side reed plates is its better tight or more loose for better performence in mid range and peak rpm too
I got this Polaris xplorer 300 4x4 with a little bit of power loss and some hard start situations but it only happens sometimes and other times it fires right up! I’m hoping it just needs some reeds replaced but if it ends up being a top end I’m not completely out
Learning. Thanks brother.
Thank you so much I was trying find the problem with my rm 250 this is it
Did your rm not rev out my rm doesn't rev out it revs to 3k rpm not more what is the problem
Thanks!
Hey i know im a couple years late in this vid but i have a 1974 honda elsinore mt250 it wont start it backfires and shoots smoke out the exost my dad says its the reeds so i looked it up and i found a few sites that say my bike didnt come with reeds can you or anyone help me?
Is your ignition timing set right? Have you ever rebuilt the engine?
Reed valve in an nutshell.
Thanks for the video. What r the symptoms?
Clear and concise 👍
Can one out of 4 reed petals slightly open (1mm), stop a single cylinder starting? Thanks in advance
It probably won't, but it definitely doesn't help.
Thanks
Excellent video plan and simple model 👍🏼👍🏼
My Yamaha blaster has been carburetor cleaned. I use the right oil to gas ratio. But when it get to higher rpm something starts to make a chirp noice. Please help
Chirp? Rev it without the air box and see if exhaust comes out of the carburetor.
Fix Your Dirt Bike I haven’t taken a look at the reeds yet
@@Fixyourdirtbike I was thinking he ran over a bird. :)
Brother wheater bad reed valves cause starting problem and slow speed problem in bike plz reply
Yes
@@Fixyourdirtbike my bike is rx135 it has pickup problem and slowspeed and starting problem , i checked all wiring but only reed valves is not changed can i change
Where is the reed valve in my Echo trimmer? I am guessing it is one of the little flaps on the diaphragm / gaskets that I replaced? Thanks for the great video!
If you have one it will be behind the carburetor.
And that's why my Banshee lost power and wouldn't rev .. Reed petals were chipped
Can you recommend reed valves for a 1980 E70ELCSA 70hp Evinrude? This is on a 15ft bass boat. Has the right prop, rpm is 5400 at full throttle.
It is the reed valve problem if the engine wont stay idle and it shuts off suddenly?when i check the reed valve it has probably in 1mm gap..my bike Suzuki panther txr150
Yes, and harder to start also probably. They are suppose to sit flush on the cage. If the petals are not damaged/broken/chipped/frayed on the edges, then you may be able to flip the petals upside down to see if they sit flat better. You can usually get more life out of them that way, but a 1mm gap sounds like a lot. New reed petals should be on your shopping list.
Can it be a reason why my bike doesn’t stay idling ? I’ve already tried to adjust the air screw on the carburetor and the idle on the choke and that’s the only way it will stay idling . But it’s strange because the choke looks like it’s coming up all the way after I’ve turned it and that’s the only way it will stay idling. cr125 1994 btw. I should probably adjust my jetting too
Possibly, but It wouldn't hurt to change your reeds if you haven't in a while and see if it helps. After that double check your jetting.
I have just done one simple test on my brand new KTM which has small gaps on the reeds. I disasembeld air filter and started engine. I was watching the carburetor intake side during slight throttle opening. I also opened choke to richen mixture.
I saw fuel mixture coming back to the air filter box at slow rpms.
I did the same test on Beta with V-Force. The result was the same. I don't know if the reeds have gaps but I going to check it.
So both bikes don't have good tight reed valve or a little of moxture can go back to the airfilter side and it is normal?
Any suggestion?
Your reed valves should have no gaps, fuel back flowing into the air box is a sign of bad reeds. Do both bikes have the same model of carburetor?
I love this guys you tube name. Lol
Quick, simple easy explanation. Thanks dude 🤘
How do I know if an aftermarket valve has good performance, is there any way to tell?
Thanks for the explanation.
Hey big fella. Where did you get those cookie jars? :)
Can bad Reed's cause a low compression reading ?
No, because you are measuring the compression of the cylinder above the transfer port.
thx
i have Boyesen reeds for my kx 100
Hi
When I take the air filter of my carb , I see white smoke (looks like exhaust gas) coming out of the air intake. The bike runs really poor idle and when I turn the throttle it bogs. I can't get it to rev. Does this have something to do with the Reed valves?
Thanks
Yes. Your reed valve needs to be replaced.
@@Fixyourdirtbike Thank you! 👍
@@Fixyourdirtbike I replaced the reeds and it worked, thank you so much!
Glad to help!
You do a good vid man. Nice to see in YT land. :)
Any experience with a PowerWing or PowerBlade??
Nothing past "oh neat" when I see one, sorry.
@@Fixyourdirtbike I've been thinking about getting another one to try. I had a PowerNow blade (discontinued) on my '03 kx100 and it really did make a significantly improved difference in throttle response. That thing ran great all year round. Never messed with jetting
Clear, detailed, interesting. You get my vote
Could this cause my cr125 not to kick over?
Thanks for this video I learned a lot!
some one told me if they are bad it can mess with the spark plug is this true
Not directly. But, with unburnt fuel accumulating in the crankcase, it will eventually richen the air/fuel in the cylinder enough to foul your plug.
Great video
Thanks!
Great video thanks
I have a cr 250 97 with v force 3 (w) . Do i have to put a bigger main jet?? Will it work lean with the v force ??
Yes, you will probably need to increase your main jet size.
I think that it's 165 now . I will need a bigger one is that right??
165 is smaller than stock. So bump up to a 175 to get a baseline tune and go from there.
Ok thank you for helping me.. if i want something more to ask do you have a page on Facebook or something like that???
@@psilos-nl8gg You can message me on facebook! facebook.com/FixYourDirtBike
well said bro!
can a faulty ree valve be considered a cause foe a smokey exhaust?
It's possible, but you most likely need to repack your silencer.
well done
Can broken reeds cause low compression
No, the reeds have no effect on the combustion chamber or rings. However bad reeds will keep fuel/air from reaching the combustion chamber, which causes a lack of power.
@@Fixyourdirtbike A broken reed will blow back "primary compression", (the crank case pressure), back into the carb tract a bit, so it does lower primary compression, (probably just at lower rpm's), and that means the bottom end is not filling as well as it should, which would then fill the cylinder a bit less and make less power. But because the compression does not start until after the exhaust port is closed on the up-stroke, (sans pipe effects), you should be right about the cylinder compression not effected.
Oh,---watching more of the vid,---that's what you said. :)
I just get a little anxious I guess. Sorry.
How about boysen super stock fiber reeds?
Tyler Murphy Can't go wrong with Boysen!
My 1995 KTM 250 ran like shit. Zero bottom end but takes off in power band. I saw some daylight in reeds. I replaced with boyeseen reeds but still not completely sealed. Do I need a new Reed cage or is a tiny bit of space ok? I'm talking less than probably half the thickness of the Reed . I haven't re installed yet
Your new reeds are good to run, that little gap isn't that big of an issue, its when the reeds fatigue that they don't close right. But it does sound like you're jetting is rich at low throttle.
Would this make your carbourator leak?
What kind of leak? Exhaust coming out of the carb? Or a super lean mix?
Exhaust = Yes
Lean mix = Yes, if the gasket is bad, otherwise, no.
@@Fixyourdirtbike either my float keeps getting stuck because it comes out of the overfill kinda like I was doing wheelies
@@Fixyourdirtbike or maybe it’s lean idk how to jet or fuck with air fuel mixture it all sounds the same on my quad
@@Fixyourdirtbike and it all smokes the same
My yz125 idles but when I put it into gear I can ride it for 200ft before it’s sputter and stops, could the reed valves be the issue? I just did a carb rebuild and top end rebuild.
What's your spark plug look like? Do you have fuel residue on the intake side of the carb?
Anyone know about getting improved Reed valves in a 09 f570?
Fix your dirt bike, can bad Reed valves cause gas/oil mixture pooling on the bottom of my filter/air box? Also can’t seem to get it running fine, took it for a ride and it waisted 3 gallons on an 2hr ride when all my friends had about 1/2 tank of gas left? Any help would be appreciated thank you
YES! That's a sign of really bad reed valves. The high fuel consumption is the first stage of failing reeds, and fuel mix in your air box means it's getting all the way through the carb, which is why your bike won't run right, so get those valves fixed ASAP!
Yes,thank you very much
Fix Your Dirt Bike could the same be said if my carb overlows ONLY after the bike is warm? I reckon it could be pressure from the engine pushing back on the fuel in the float, which opens the float needle. I’ve cleaned that carb thoroughly and its not due to dirt/grime. It only overflows when the engine is warm and then it flows drastically.
hi mate my sons ktm50 is and pain to start and whn it starts it runs bad ive turnd my reeds over this mean there no good
I'm not sure what you mean by turned the reeds over.
Justin Purton I just now realized what you meant when you said turn them over. I have never turned the petals on any 2-stroke I've owned. I was told long ago that the fatigued petals have a higher chance of breakage when turned.
i know this is an old comment but i had to speak up. i have the v force 3 reed valve in my 2001 honda cr125 i have had my petals reversed based on slight outward curve they are still working 100% even moto tassinari who make the v force reed valve say it is totally fine to turn the reed petals around with no issue just get a spare set of petals ready to replace THEM they wont be to good after they have been turned. I KNOW THIS IS AN OLD COMMENT.
Do you need a window piston to run a reed valve?
Good question! No, you do not need to run a windowed piston with a reed valve.
@@Fixyourdirtbike thank you.
Anytime!
Great explanation
So the reed valve is pretty much the powerband?
No. The powerband is the rpm range where the bike makes the best power/usable power. It varies due to many factors. Such as; you could have two different expansion chambers, and on the same bike one might make power down low while the other makes power at higher rpm. Changing the expansion chamber effectively changes the powerband, or the rpm range that the bike makes power
I got a 96 ktm exc 300 and it keep killing the plugs think is the reed valves? Or can u help me solve the problem?
Reed valves will cause fuel issues, but what is your carburetor jetting like? How long since your last reed valve service?
Reed valves looks fine to me.cant remember my jetting I will check but if I put in a new plug it start fine rides like for and hour or less wen u stop it won’t start again put a new plug and it starts and ride again and the old plus is dead
My main jet is 170,slow jet 42,needle N85D
Sounds like your main is too big. Drop to a 168 and see what happens.
Fix Your Dirt Bike ok
Can a reed valve can cause more gasoline consumptions?
YES!
@@Fixyourdirtbike how
@@listomoto When the reed valve doesn't close during compression, it will send pressure out through the carburetor, creating vacuum, but in the wrong direction, shooting fuel out of the carb intake.
@@Fixyourdirtbike i have a bike that consumes too much gas compare to other exact model. when checking my reed valve the tip of the petals is curved resulting from a small 2mm gap opening. do you recommend replacing it?
Yes
How does the valve close on the down stroke
Each reed petal is like a spring and closes on it's own. That's why you loose power when the petals get worn out. When they can't close they let the air/fuel mix back into the carb instead of up through the transfer port.
Oh ok thank you
Fix Your Dirt Bike would this cause a no start situation?
If the reeds are bad enough, yes, but it's not likely.
Will sasso doing 2-strokes now!?
Joke's on you, I'm a Sass man.
Hi friends , i need help to buy a new cylinder for my CR 250 '99 , because i need the 12101-KZ3-J10 , but i only find 12101-KZ3-L10 , and that is for the 2000-2001 model , there is some difference betwen this models? or simply the 2000-2001 dont fit (or work ) in the 99 ? , greetings from Chile!
Krassna Wasaff Call a Honda dealer and ask them ;)
In the werds of southparks-
stans dad: thaaaaaaaaaanks !!
"I though this was America!"
How do I know my reed valve needs replacing?
Noticeable power loss in high gear, and look for fuel/oil residue in your carb throat between the slide and the reeds.
How many miles roughly will they last on my Vespa T5?
I wonder how it would affect the power if it uses tesla valve instead 🤔🤔🤔
HAHA! I think that only works on water though. But the length would make for some great fuel atomization if it could fit.
Who invent reed valve ?
The reed valve was built into the original design of the 2-stroke engine that was patented in 1894 by Joseph Day.
Hey what happened to the cookies from the cookie jar???🤔🤔
John stole the cookie from the cookie jar! 🍪
Yamaha
1:50 so you vape.
Or start at all
If the reads are bad enough yes, but reeds are low on the list of why a bike won't start.
Bad reed valve, will couse lost of compression
Sorry but I didn't understand, was this video about Reed valve or about your face?
Face
Great video!!!!!!!!
Where are the cookies
JWG vibes
Where'd your eyebrows go?
Burned the follicles when I was a kid playing with fireworks
damn. Im new to 2 strokes but want to be a mechanic in the future. Great informative video though
Thanks for watching! Good luck!
helmet burn sucks
look at his forehead
I know right!