How A 2-Stroke Reed Valve Works | Fix Your Dirt Bike

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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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10 июл 2016

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Комментарии : 192

@Fixyourdirtbike 6 лет назад

Learn more about your *Dirt Bike* here! → bit.ly/fydbhow

@keithduffield5239 3 года назад

Nice demo - warm friendly demeaner - thank you.

@tylermurphy7331 7 лет назад

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

@mattymccolgan9453 5 лет назад

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

@granttoye5852 4 года назад

Great video with clear explanations! I plan on adding reeds to my 66/80 as a first mod

@Fixyourdirtbike 4 года назад

Thanks!

@brandonwyatt3901 5 месяцев назад

Nice and straight to the point ,

@cheeseburgerrunner5217 2 года назад

Quick, simple easy explanation. Thanks dude 🤘

@levitrap6072 6 лет назад

Love you're channel brother, 👍👌👏 plz keep the vids flowing, I'm jus now getting back into mx again after a 15 year break

@Fixyourdirtbike 6 лет назад

Thanks for watching!

@richardpacheco9330 5 лет назад

Thanks for the explanation.

@adamskinner5868 2 года назад

thanks, simple, clear and informative ;).

@camselkirk7248 4 года назад

Awesome video man. Thank you

@buryurfear14 6 лет назад

So simple! Only ever owned 4 strokes until my kids JR50 so I'm clueless to the differences. Great vid! sub'd.

@Fixyourdirtbike 6 лет назад

buryurfear14 Glad you liked it!

@Tbirdshockey7 5 лет назад

Thanks for this video I learned a lot!

@michaeleisenbise4278 6 лет назад

Well done. Very nice explanation. Thanks taking the time and making the effort to develop this video.

@Fixyourdirtbike 6 лет назад

Glad you liked it!

@TheYoungnut27 3 года назад

Excellent video plan and simple model 👍🏼👍🏼

@mayberry6025 Год назад

awesome video dude, subscribed for more of this!

@gmindgjerd 5 лет назад

Learning. Thanks brother.

@reisender8889 3 года назад

Clear and concise 👍

@reacew8678 3 года назад

good demonstration

@jayppop3333 6 лет назад

Great video thanks

@nainka11 3 года назад

Thanks .......and Well done

@GunnyD 6 лет назад

Thanks for the video. What r the symptoms?

@babelbear 5 лет назад

Clear, detailed, interesting. You get my vote

@Sanjeevkumar-yv5th 5 лет назад

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

@desertrider325 4 года назад

Thanks!

@camdencrotwell349 11 месяцев назад

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

@acolonnh1 8 месяцев назад

Great down and dirty well executed video

@zaimahmamat3141 Год назад

Thank bro

@EarthSurferUSA 2 года назад

You do a good vid man. Nice to see in YT land. :)

@RedfishCarolina 2 года назад

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.

@theblackeyedone5464 3 года назад

Thank you so much I was trying find the problem with my rm 250 this is it

@jaundreswanepoel97 3 года назад

Did your rm not rev out my rm doesn't rev out it revs to 3k rpm not more what is the problem

@xx3868 8 месяцев назад

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?

@PhilArttz 3 года назад

thank fking god I found your channel, I can finally fix my damn scooter. greeting from germany!

@mxgryan 5 лет назад

well said bro!

@44mroliver 7 лет назад

well done

@16507487 6 месяцев назад

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 ?

@johnquinn9759 Год назад

Thanks

@localenterprisebroadcastin5971 3 года назад

Love the doc brown reference

@benr8071 4 года назад

Anyone know about getting improved Reed valves in a 09 f570?

@clownassbutthead6378 Год назад

How do I know if an aftermarket valve has good performance, is there any way to tell?

@RSL_Louie 7 лет назад

Could this cause my cr125 not to kick over?

@ridebc153 4 года назад

I love this guys you tube name. Lol

@rickmarkley2167 Год назад

Can a bad read keep you from getting fuel from the fuel tank

@2stepYo 29 дней назад

thx

@wojciech8881 7 лет назад

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?

@Fixyourdirtbike 7 лет назад

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?

@g.g4816 3 года назад

Great video

@Fixyourdirtbike 3 года назад

Thanks!

@KentRoads 4 года назад

Can one out of 4 reed petals slightly open (1mm), stop a single cylinder starting? Thanks in advance

@Fixyourdirtbike 4 года назад

It probably won't, but it definitely doesn't help.

@condor5635 5 лет назад

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!

@Fixyourdirtbike 5 лет назад

If you have one it will be behind the carburetor.

@DialedRiders69 Год назад

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.

@bmjca123 4 года назад

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

@Fixyourdirtbike 4 года назад

Ooof! Ya, looks like you'll need to split the case and check everything inside.

@SWFLJetSkiRiders 4 года назад

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?

@Fixyourdirtbike 4 года назад

Oh yeah

@wyattoutlaw2370 7 месяцев назад

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?

@Fixyourdirtbike 7 месяцев назад

I would replace them on principle. New carbon reeds will be far superior to stock 30 years later.

@superflanker972 2 года назад

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

@EarthSurferUSA 2 года назад

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.

@guiltygearcore 10 месяцев назад

Reed valve in an nutshell.

@1slattnite188 5 лет назад

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

@Fixyourdirtbike 5 лет назад

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.

@radconserv68 5 лет назад

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?

@Fixyourdirtbike 5 лет назад

If your valve broke you would definitely know. Reed valves usually wear out over time. I'd still check them though!

@YeetMeyer 5 лет назад

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?

@Fixyourdirtbike 5 лет назад

Is your ignition timing set right? Have you ever rebuilt the engine?

@tdutton2098 5 лет назад

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

@Fixyourdirtbike 5 лет назад

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!

@tdutton2098 5 лет назад

@@Fixyourdirtbike thanks man, I appreciate your help and support, your videos are always great. Have a great day an keep on rippin

@mikehunt3767 3 года назад

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.

@Fixyourdirtbike 3 года назад

What's your spark plug look like? Do you have fuel residue on the intake side of the carb?

@justindwyer3832 6 лет назад

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

@Fixyourdirtbike 6 лет назад

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.

@dkwatters8476 7 лет назад

I have been having bogging problem when full throttle in 4th and 5th gear on 2003 cr250. do I need new reeds?

@Fixyourdirtbike 7 лет назад

I would check your main jet first. It may be clogged, or if your spark plug is wet, you are running too rich.

@hiphopaDIZZL 7 лет назад

lean the carb out brah

@ivanwasaff1011 6 лет назад

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!

@vidar0000 6 лет назад

Krassna Wasaff Call a Honda dealer and ask them ;)

@EarthSurferUSA 2 года назад

Hey big fella. Where did you get those cookie jars? :)

@TheDarios1988 6 лет назад

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

@Fixyourdirtbike 6 лет назад

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!

@TheDarios1988 6 лет назад

Yes,thank you very much

@mauritzvonzijl4220 5 лет назад

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.

@ovhgermany9958 2 года назад

i have Boyesen reeds for my kx 100

@here_to_watch2115 6 лет назад

Can bad Reed's cause a low compression reading ?

@Fixyourdirtbike 6 лет назад

No, because you are measuring the compression of the cylinder above the transfer port.

@ExitDoink 4 года назад

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

@Fixyourdirtbike 4 года назад

Yes. Your reed valve needs to be replaced.

@ExitDoink 4 года назад

@@Fixyourdirtbike Thank you! 👍

@ExitDoink 4 года назад

@@Fixyourdirtbike I replaced the reeds and it worked, thank you so much!

@Fixyourdirtbike 4 года назад

Glad to help!

@VISHNUGAMER 3 года назад

Brother wheater bad reed valves cause starting problem and slow speed problem in bike plz reply

@Fixyourdirtbike 3 года назад

Yes

@VISHNUGAMER 3 года назад

@@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

@joeywebb4796 6 лет назад

some one told me if they are bad it can mess with the spark plug is this true

@Fixyourdirtbike 6 лет назад

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.

@rylanmoore970 4 года назад

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

@Fixyourdirtbike 4 года назад

Chirp? Rev it without the air box and see if exhaust comes out of the carburetor.

@rylanmoore970 4 года назад

Fix Your Dirt Bike I haven’t taken a look at the reeds yet

@EarthSurferUSA 2 года назад

@@Fixyourdirtbike I was thinking he ran over a bird. :)

@tylermurphy7331 7 лет назад

How about boysen super stock fiber reeds?

@Fixyourdirtbike 7 лет назад

Tyler Murphy Can't go wrong with Boysen!

@markhawkins5324 4 года назад

Great explanation

@justinpurton3514 8 лет назад

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

@Fixyourdirtbike 8 лет назад

I'm not sure what you mean by turned the reeds over.

@Fixyourdirtbike 7 лет назад

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.

@jaybob-uh8hm 7 лет назад

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.

@MaWaMYaj 6 лет назад

can a faulty ree valve be considered a cause foe a smokey exhaust?

@Fixyourdirtbike 6 лет назад

It's possible, but you most likely need to repack your silencer.

@legenderekonwheels 3 года назад

Any experience with a PowerWing or PowerBlade??

@Fixyourdirtbike 3 года назад

Nothing past "oh neat" when I see one, sorry.

@legenderekonwheels 3 года назад

@@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

@kendolbowens1049 6 лет назад

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?

@Fixyourdirtbike 6 лет назад

Reed valves will cause fuel issues, but what is your carburetor jetting like? How long since your last reed valve service?

@kendolbowens1049 6 лет назад

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

@kendolbowens1049 6 лет назад

My main jet is 170,slow jet 42,needle N85D

@Fixyourdirtbike 6 лет назад

Sounds like your main is too big. Drop to a 168 and see what happens.

@kendolbowens1049 6 лет назад

Fix Your Dirt Bike ok

@kxlucifer 6 лет назад

Do you need a window piston to run a reed valve?

@Fixyourdirtbike 6 лет назад

Good question! No, you do not need to run a windowed piston with a reed valve.

@kxlucifer 6 лет назад

@@Fixyourdirtbike thank you.

@Fixyourdirtbike 6 лет назад

Anytime!

@funnyfudgeman16 7 лет назад

How do I know my reed valve needs replacing?

@Fixyourdirtbike 7 лет назад

Noticeable power loss in high gear, and look for fuel/oil residue in your carb throat between the slide and the reeds.

@danielwoodgate007 6 лет назад

How many miles roughly will they last on my Vespa T5?

@listomoto 4 года назад

Can a reed valve can cause more gasoline consumptions?

@Fixyourdirtbike 4 года назад

YES!

@listomoto 4 года назад

@@Fixyourdirtbike how

@Fixyourdirtbike 4 года назад

@@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.

@listomoto 4 года назад

@@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?

@Fixyourdirtbike 4 года назад

Yes

@dfish905 7 лет назад

How does the valve close on the down stroke

@Fixyourdirtbike 7 лет назад

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.

@dfish905 7 лет назад

Oh ok thank you

@128gardener 7 лет назад

Fix Your Dirt Bike would this cause a no start situation?

@Fixyourdirtbike 7 лет назад

If the reeds are bad enough, yes, but it's not likely.

@orivera215 Год назад

And that's why my Banshee lost power and wouldn't rev .. Reed petals were chipped

@mikewilliams7330 3 года назад

Great video!!!!!!!!

@jesseshanor4991 3 года назад

Can broken reeds cause low compression

@Fixyourdirtbike 3 года назад

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.

@EarthSurferUSA 2 года назад

@@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.

@EarthSurferUSA 2 года назад

Oh,---watching more of the vid,---that's what you said. :) I just get a little anxious I guess. Sorry.

@Manchild..dadchild 4 года назад

In the werds of southparks- stans dad: thaaaaaaaaaanks !!

@Fixyourdirtbike 4 года назад

"I though this was America!"

@cody-gaming7593 4 месяца назад

Would this make your carbourator leak?

@Fixyourdirtbike 4 месяца назад

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.

@cody-gaming7593 4 месяца назад

@@Fixyourdirtbike either my float keeps getting stuck because it comes out of the overfill kinda like I was doing wheelies

@cody-gaming7593 4 месяца назад

@@Fixyourdirtbike or maybe it’s lean idk how to jet or fuck with air fuel mixture it all sounds the same on my quad

@cody-gaming7593 4 месяца назад

@@Fixyourdirtbike and it all smokes the same

@oprghost7227 Год назад

So the reed valve is pretty much the powerband?

@middlesiderrider Год назад

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