Motorized Bike Air Leak (How To Find And Fix)
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- Опубліковано 16 січ 2022
- An air leak on a motorized bike is not just annoy, but it can quickly blow your motor.
This bottom end has been dealing with an air leak for a while, and I finally found it.
To find the air leak I spray starting fluid around every sealing surface while keeping a water hose near by.
While spraying I listening for any dip in RPMs, and I will repeat the test at least 3 times to be sure.
Areas to check:
Throttle piston cap, hose clamps, reed block, intake adapters, base gaskets, case gaskets, and crank seals.
Crank seals: www.amazon.com/KQTshangmao-se...
We upload motorized bike videos every week (sometimes more)!
FAQs:
Oil: 32:1, semi synthetic, random brands.
Gas: 87oct
Spark Plug: NGK B8HS (yd-100), NGK B6HS (pk80)
Parts: I buy mostly from Amazon.
Favorite Motor: Zeda (Firestorm) Triple 40
Favorite Carburetor: NT Speed
Favorite Bike For A Motor: I don't have one yet.
To contact me directly find me on Discord "LA Hover#1036"
For motorized bike help, join the server / discord - Авто та транспорт
FYI, STARING FLUID IS FLAMMABLE! ... I should not have to tell anyone this, but yeah, keep a water hose nearby...
Lol
You shouldn’t have to tell anyone but I look at it like McDonald’s shouldn’t have to tell you the hot coffee you just bought is HOT but they do cause someone sued them before they put warning labels on the cup.
So that's the triple 40 bottom end, right??
But why?! Don't you also love fried bikes?
Does lubricating the magneto increase performance?
It is my opinion, if you are using the reed valve kit, Your crank pressure rises. The seals will be the first item tested to the max. Good video.
wouldnt say so, reed kit enlarges crankcase volume
You have the most informative videos on UA-cam. Thank you so much for helping us all out from the motorized bike community. ☺️
I appreciate that!
Ive always been afraid tho change my own seal, ive bought new bottom ends because of this. But tonight i changed the seals on my yd100 after watching this video
Nice! I hope they hold strong for you :)
Man thanks Hover. I tried everything except new seals and of course that's where the leaks were. It idles now. Much appreciated, my dude.
Got myself a crank seal air leak straight from factory. Thank you for the video. Really helps. Just ordered some crank seals and will be doing this job myself. Wish me luck!
Good luck! I don't know if it's common for these seals to have tiny leaks, but if you spray the seal and the RPMs drop significantly than its definitely time to replace.
@@LAHover Just did the job and I'm dumbfounded at how low she idles now. These little motors are quite the learning process. I had been running her with this air leak since break in (pretty sure I had a horrible break in because of it) and have slowly been learning more and more about these little motors. It was only suppose to be a small little project since I got into motorcycles this year but it ended up becoming a hobby with me registering my bike build and using it to commute with my new motorcycle license, haha.
Thank you so much for all the videos because they have been a huge help. I like how you show the whole process and even your struggles and failures (even I am trying to come up with a proper wired-up electrical system). Your videos are very entertaining and are extensively helpful. Thank you.
@@LAHover Hey there Hover. I got myself a problem and can't seem to find what's causing it but I keep blowing crankseals! I'm now on my third crank seal magneto side. Maybe the seals I'm getting aren't good enough? I find that my seal is blown in half! That is, they split right up from their middle diameter, splitting into a outring and inner ring. Do you have any recommendations for fortifying seals?
Thanks Mr. Hover, that informative seal leak vid. really drove home the importance of all 2-strokes need for a leak-free crankcase. I've seen several YT small engine repair gurus using a vacuum gauge & hand pump to verify leak free status before reassembling the chainsaw, weed whacker, etc.. Now, I see the symptoms while you describe them in real time, & your leak check spray diagnostic tool! Auto mechanics "spray" 4 stroke manifolds, carb flanges, vacuum lines, etc. to find vacuum leaks wherever intake vacuum might be, listening for that rpm change. Great teaching!👍
thank you for golden information , love you , people will be able to fix their motorized bikes because of your hard work and generosity
Sweet! Glad ya got it fixed! Congrats! And ride on bro!
My bike has been running lean for a while now like where it shuts off at idol and it runs away, rode it at least 30 miles, no damage. I checked every single seal including crank seals, no leaks. I think I'm gonna replace the crank seals. Anyways because they are very chewed up, maybe I just didn't spray it right. Thanks for the awesome video man! I absolutely hated the runaway especially in the city where it's so loud at stop lights. Glad you got it running good!
Your motor is a trooper Epic :) Glad she is holding strong for you!
Dude u finally solved my problem... That's why my bike won't idle
Glad to help :) this video was long over due.
At least it got there
I feel like this is my problem too my bike won't idle at all. Soon as I go to stop the engine stops running.
@@michaeldrake9601 same here
That's awesome brother I'm so very glad you found it.. can't wait to see how it compares to the ported cylinder
You and me both!
Hi I just bought a new engine 80cc had it running good noticed the head bolts needed to be tightened so I did that now my bike won't start ..iv only ran about a half tank so far 40:1 I also noticed that I had no smoke coming out the pipe..I checked my plug it looked light gray and brand new still ...iv tried everything good spark, cleaned the carb, checked all electrical seam to check out good ..I'm am so confused why I'm having this problem any help would be much appreciated .
I'm so glad you did this video.....I am also started a mineralli build and there's limited info so every bit helps... thanks....ride on
Glad it was helpful! Thanks for the feedback :)
I enjoy your enthusiasm I'm new to the sport but I must say is a little carried away.
Had and air leak issue on my rig and it took a while to fix, meanwhile I run it like I stole it for almost a year and had no engine damage but I guess is due to high oil mix I am using 25:1.
Alex from motored life showed in on of his videos that they make a seal saver for motorized bikes. the high compression motors put a lot of pressure on the magnet side because it’s smaller. It’s a piece of metal that screws in under the magneto so it can’t pop out.
Thanks for the info, I'll definitely be looking into some!
I really needed this video!
The bike looks great! 👍💯🤙🚴♂️💨💨💨✌
Great video bro!
my maximum distance on motorized bike is 19 miles as the crow flies one way, via paths and allsorts. i intend to beat this record this summer! its gonna be good!
Thanks man
Once again good job. Keep up the good work your doing. I know you have done this in the past, however you have come a long way. Could you do a video of your best recommendations for beginners. Then what you consider the ultimate configuration to date.
Thanks, I'll try to get a 2022 recommendations video up soon.
You know I was thinking about it and I think I might have the same issue thank you
Good luck on your build, easy fix. Just make sure you don't push the new seals in to far like I think I just did lol...
Do you have another link I could use or could I find this at my local auto parts store? I just want to make sure I get the right size, I'm pretty new to these engines and I have an air leak in the same spot. I have a Zeda 80 Firestorm.
What exhaust is that it sounds crazy good
Thank you.
My bike does not idle or start well when it is not choked. If I get it a bit above full choke, it starts and idles properly. Does this mean the seals with the carburetor are the fault?
what oil did you use to lube the middle of the seal?
Mine yesterday was running at a very high idle. So high infact that when comming to a stop I chose to not pull the clutch and let the engine slow me down. I know that doing that can fold the chain up but was scared the motor would over heat. Think that my head gasket isn't sealing all the way.
Whats the jets you ended up using on the pz20?
I took off my engine, because of a leak and blow out around the muffler or jog but can not tell but I will try the starting fluid
Where did you get the handlebars
Hey guys, My carburetor is leaking gas from the cover area which i think is called a float. Its the NT carburetor with the red cover. I checked my donut it has no holes and it wasn't stuck. Any advice?
I had a marine bike everything was good until I hit a pothole breaking my seat post after that my engine started to destroy itself because of so much vibration the drive sprocket loosened and the chain keeps popping out.
I thought my idle didn't sound right. I was looking for examples of a correct idle on these motors and I think I finally found it here. My bike idles fairly high and soft and it takes ages for the rpms to drop. The revs drop somewhat faster if I unscrew the idle screw, but then the engine dies if I let go of the throttle of course. I got it to idle better at some point, but I feel like it's gotten worse again.
Funny thing is I ran the bike for about 400-500 km already and it seems to run alright. I had the feeling it was running a bit rich though and I found a fairly good spot with the stock jet with the needle at the leanest setting. People tend to say the stock jet is fairly rich so maybe that compensates for whatever problem I have. I was also running very oil rich for maybe the first 200 km and I didn't exactly go soft on it during break in, so now the piston top is really black and it seems there's been blowby happening too cause there's smears under the rings, lol. Well, replacement isn't too expensive. I just hope the eventualy failure won't be catastrophic.
what kind of starter fluid should i get
hi i get mine started by poping the clutch but then it dies after 10 seconds like the engine doesnt start burning gas or maybe no spark but also the engine never clicks to be able to start it why doesn it click?
You have to modify the pipe to get it to fit?
I live at 4600 foot elevation. Mine was running to rich so I moved the clip up to the second notch from the top. It was then running perfect except at full throttle. So I ordered jets. I got the wrong jets, so I put the carb back together and back on the bike. Then it was running to rich again. Apparently I had an air leak at the carb mount that I fixed when I put it back on. I moved the clip to the top notch and it's only running rich at full throttle. Now it idles much better. The correct jets are on the way.
Will flex seal fix the problem
Could you please remind me what bottom end are you using? Is it a PK80? If so, may need to buy some. I have a brand new PK80 Zeda FS, and she was leaking. Tested for leaks, but not the seals. Too late though. Seat stay bolt snapped, and I botched the repair. Happens when you’re over tired and think you are able to get the job done. Lol. Will need to replace right half, and might as well change the seals while at it. Attempting to JB weld and tap a new 8mm thread…for science sake. Lol.
Thanks for the videos as always.
I am using one of my shitty engines as a tester but one test im. Doing is instead of switching rhe seals im using liquid JB weld ard em i know it will work i just want to see how long it will work for
what about using crisco as grease?
That's great that you got it fixed.So we all aren't 'searching' for hours,what grease did you use in the seals that won't harm rubber?I used Molybdenum on all the steel parts,including cables before putting them in sleeves,and spray Silicone on rubber,but haven't considered a grease for the seals.Thanks in advance.
This time around I just oiled the inside and used ultra gray gasket maker on the outside.
I thought it was a leak in my 212cc bcuz it was only running with choke on so I changed to a bigger jet and it runs dope now💯✨✨✨✨✨✨
awesome vid man!!
Holy fuck LA hover bikes you are a wizard! this is like the exact problem I have with my bike right now thanks bro!!!
Here before 100 views!
That's a good one, personally I use for the crank SKF 6202 TN9/C3 and for the clutch 6202 2RSH/C3 the crank seals the chinese ones...
Exhaust pipe link?
Man I just put mine together I just had to order a new CDI when I take the spark plug out it sounds like it's doing what it's supposed to when I put the spark plug in it barely making any sound at all
Good job easy fix, only thing and I gotta say it because as you know people do what they see cause they think we know the best ways to do this stuff and your amount of viewers is greatly larger then mine, but I wish you put in or if you can add a DO NOT DO THIS AT HOME type of a thing about the spraying starter fluid. It’s extremely flammable and god forbid a kid sees this and just does it thinkin it’s safe to do it. Sorry to sound like a downer I’m not just tryin to look out, but either way great job fixing it. I know what a bummer it is tryin to chase down an air leak like that. Especially when you have more then one or two bikes and you feel like your getting pulled in all ways to fix them and don’t have the time to do it.
Yeah, I was wondering what would happen if he sprayed directly onto a hot engine exhaust port/pipe. If it'd be hot enough to ignite without spark or flame... My petcock valve on my motorcycle started leaking/dripping gas right onto my hot engine once. Had to quickly pull over, my buddy said he knew a guy who got burned really bad on his Harley when his petcock valve started leaking...
Hey Beavis, they call it a pet-cock valve...huh huh uhh huh huh
Anything you spray on a engine too check for a air leak is flammable, what do you use ? You can use several products, one is wd40 another is brake cleaner , and what LA used there is No none flammable product to do this procedure, if thier is please let us know , this is a very common practice that you do
@@darcyhemeon4309 no I think your missing what I’m sayin here I do the exact same thing but people are mostly dumb and don’t have common sense. They might see this and think o I can do that and just spray wildly not caring about how they do it or directly on the manifold or something like that, they might not have a hose near by or a fire extinguisher, that’s what I’m getting at. I think this has to be done unless you have a fog machine. So I’m not saying don’t do it. I’m sayin tell others not to do it as a WARNING ⚠️ don’t try this at home kids, adults that live at home with their parents and anyone that also calls their dad uncle. That’s all I’m sayin.
@@JMB676 absolutely I get exactly what your saying , good call , Mc Ds coffee is a good example
Will those seals you linked fit a YD100?
My yd-100 uses two of the thicker seals. The one that goes on the clutch side, you will need two of them.
@@LAHover Thanks man
wow this is the video i shouldve been watching
i think my yd100 needs a new seal. it is consuming too much gas and it's kind of weak
I wish I could figure out as to whether or not my bike can even idle because the second I come to a complete stop the engine is or has been completely turned off way before then maybe my clutch isn’t tight enough or perhaps I’m nowhere near done the buildbecause everyone talks about the two-stroke being able to just idle and sit there to heat up which I would love but mine does not really do that. It’s either move at full speed which is a 20 to 25 miles an hour or nothing which makes turning around or doing a quick U-turn in a small space very difficult, because I have to return it on every single time.😂
One issue that I think would help fix it is having an actual level intake because mine is at quite an angle right now working angle, but not correct angle light level, for example😢
All tuning should be done on a 'normal operating temp engine' Cold means nothing you don't spend most time riding on a cold motor. These carbs have no auto choke and/or no choke at all so it should not idle well if at all when the engine is cold.
Just got done with the build on an A 100 Feb 26 winter in Wisconsin have a bit of a rattle on rev any ideas.?
Ps first time building one of these.!! I do have a video short uploaded.
Pps love the flag.!!!
Also how do I know what brand my engine is.?
These motor always have little rattles, something as simple (and normal) as the clutch plate moving around can drive a new builder crazy. Hard to tell in the video, but make sure your motor mounts are solid.
@@LAHover thank you, mounts seem solid been checking after every ride.!
@@LAHover where do I get these parts and do you think there interchangeable?
Would be nice to do my 2 occ choppers like that
What exhaust pipe are you running on that? I've been looking around for a good pipe but all I'm coming across is generic pipes.
It's a jog pipe. They are made for these cylinders, but they need to bee cut and re-welded at the first bend to fit on a bike.
www.amazon.com/Performance-Exhaust-Muffler-Minarelli-1PE40QMB/dp/B0767XHR96/ref=sr_1_2?keywords=minarelli+exhaust&qid=1653239542&sprefix=minarelli+ex%2Caps%2C105&sr=8-2
@@LAHoverthanks for the info! I have a pk80 motor with a upgraded head and mz65 replica pipe, every bike I've built used one, got any suggestions for a pipe without the dio cylinder? Pretty sure that's what it is, right?
Love the look but im going 4 stroke.
Nice information.. Can I use Carbu cleaner or WD40 to find leaks ?
Yes Any sort of flammable liquid can be used. Carb cleaner, brake cleaner, starting fluid, and propane
Could I ask, what seals does the 85cc iron sleeve have? The same as the YD?
I just want that motor so bad
Should take the same YD-100 seals. But I never checked to be honest.
Hey dude wondering if you or anyone else would know how do I stop the woodruff key falls out of the cam shaft because the bolt keeps coming undone or snaps after 2-3 weeks of riding
Use blue threadlocker so the bolt stays on and the woodruff key should be fine after
@@TheSrduglass yeah I’ve tried that once and couldn’t get the bolt undone as a tooth on the cog snapped it just kept turning the cam so I got to figgure out how to get the bolt out
A couple drops of super glue on the woodruff key works.
anybody know any good sites for cheap individual parts
I'm from central europe and there are a few sites that sell individual parts as well as the motors themselves. If you're not from an english-speaking country, you can just try to google in your language. Sorry if you're from the us and my answer is pointless to you.
Order stock reeds ???? That intake might be your issue personally I never had that issue ever on one of these conversion kits also I never ran spacer plates in my engine not really sure how to help you here but I'm going to order a VM 24 because the VM 20 I have is kind of too small I believe maybe a VM 22??
FYI I've never had a seal go in any of the engines I build with a 70cc minarelli g2 Reed hybrid , I used locktite on my seals on installation, and I've built Alot of engines
@@darcyhemeon4309 my seals fine 2.. I don't know why he's having trouble I really wanted him to hop on and rip it just like I did when I build my first conversion it was satisfying knowing that you could just bolt it on basically and have instant power
The air leak was on the Chinadoll case probably a factory fault when he ran the ported China doll cylinder before he put that G2 Reed intake on, my spacer and minarelli cylinder , it's easy to get a bad seal , it can be a small leak that gets bigger during time. Why are you so convinced it's a problem with my setup ???? Ive heard You say this severally times , have you ever tried this setup .. I know you haven't and your just giving a opinion on something you have never tried Moses Merk
I have not had the chance to try the VM carbs yet so I can't say. As far as the G2 Reed goes, mine is sealed, the issues was the crank seals. Will have her running strong here in a few days and we will take it for a nice rip :)
I think this is the first set I have ever had to replace, just unlucky maybe. :)
5th like 👍
Start by swapping out a new carb. For the price keep a spare ready. If that works, you've wacked off half your variables. More. Then see what kind of tuning you have available. To keep from recurring get the ethanol out of your gas (easy) - and switch to a full synthetic oil and lighten up on the lube - max of 40:1 per the label. The ethanol is more trouble than it's worth - and cheap carbs corrode into aluminized jelly within hours - completely a non-starter no pun intended.
If the new carb doesn't work - you're up.
me and my brother ours have the same issue. what's crazy is the engine is brand new. thanks for the upload
Glad to help, and good luck with yours.
Has anyone ever sprayed the flex seal on air leaks
In my country, they go crazy for these two, 13:21
i made my exhaust gasket out of thick leather, it hardens when the engine gets hot and works like the stock!
Every time I lean to the left it revs higher and when I lean to the right it revs down and sometimes dies
Depends on which side of the engine the screw is on. Carb side tighten = lean, (decrease) Exhaust side tighten = Rich (increase)
Can an exhaust leak cause similar idle issues as an intake leak?
I don't think so.
@@LAHover that's weird because my exhaust gasket is blown but my intake area is all tight and snug. And my engine only revs up when I'm pulling the clutch whilst going into the wind. It idles fine but if I disengage power while there's lots of wind it will Rev up. I'm replacing the gasket tomorrow so I'll let you know if that fixes anything.
@@LAHover huh thats funny because after replacing my exhaust gasket its fixed. also it was running really lean so it had a hanging idle
@@cosmicpanther63 Good deal. Note that's why I said "I don't THINK so" I'm not all knowing. Too many know-it-alls just waiting to say "I told you so"...
If anyone is so dumb that they don't know a fluid for Starting an engine isn't going to burn then they should be walking slowly with no gum chewing.It's Ether !Good gosh,even the can warns boobs that it burns.It's nice that you warned them.It shows they can read at least.
how did you remove the magnet?
Most slide off after removing the nut. Some need to be pull off with channel locks.
@@LAHover mine is hard,i can't pull it.
@@LAHover can i use a vice on that
Don't want to squeeze too hard, might damage the magnets and plates. Just try to wiggle it up and down, working it loose.
@@LAHover ok thanks i'll keep that in mind
What if you can't get it to start ?
Could be many things. For help you can join the discord server linked in the description.
@@LAHover the what. I think I'm having air leak now
If anyone can help. Why won't my bike start? Like it spits and spudders
For live bike help you can join us on discord. Link in the discription.
@@LAHover I don't have discord or know how to use it😅
@@LAHover and it starts btw but my bike only goes 20mph and I'd like to go at least 30mph cause I used my bike as a daily commuter to and from work so I'd like to keep up with traffic abit better if I need to
Air leak detection at idle isn't easy , you pressure test with 6 psi wait 30m it's a real pain . Different world under load conditions as you know . Those cranky seals can leak in only one direction eg vacuum only l heard, painful .In a pinch i used a heat gun to fix up a seal? Luck, can't leave any scratches on the surface when removing them. The reeds, i saw legend Samodel tuber glue them to same shape piece of glass then sand to flatten and thin the graphite to your preferences of tension . What a pain, multiple bikes make things complicated also .
I made a chopper ( bicycle frame) with ape hangers and i still don’t have brakes and has run away multiple times, lemme tell you if you ever have a run away find an up hill slope to slow down and hold kill until it dies (saved my life trust me) or just have good brakes
I’d prefer good brakes lol😂
I have exactliest this same McProblem on my mystery engine. I built me a trike a couple of years ago from a Schwinn stingray chopper, and a Heastrom 24" trike. And I've been fighting everything ever since it seems. Until now it just flat won't start at all! I've had to replace the CDI from a stage II and a coil off of a little 4 wheeler to a mystery coil. Then to the stock CDI coil combo. Had the headgasket leaking so I built one out of copper. Got so frustrated with the whole deal. I pulled the engine and decided to go 4 stroke. So after cutting half of my frame out to mount the 4stroke over the axle. It sucks. I hate it. Can't keep the (mouth full of cuss words ) chain lined up. Turned my whole build into
An abortion and now I've given up hope and I don't even care anymore. I quit!!!!!!!!
That intake is definitely effecting the performance.
And for the phantom owners beware the heads suck they never sent me Emmanuel with my kit and the break-in I guess it's supposed to be 20 to 1:00 and then whatever comes after 20 to 1:00 you're supposed to be running them at now my phantom yesterday blew up cuz I was running 35 to one for breaking and then went to 40 to 1:00 soon as I went to 40 to 1:00 the nickel plated came off a chunk of the aluminum busted and destroyed and I mean destroyed the the piston and the cylinder
First?