Porting your 2-Stroke motorized bicycle engine

[@BeezyKing99]

for all those who are curious about the link, forget it, it's a broken link which brings you to a page that isn't even related to this guy's channel.

[@BaileyEvans]

I would like to see some examples of these mods running.

[@gkcoupe]

hi i just wanted to thank you for all your helpful advice.. this video helped me gain 10 mph.... i did exactly what you suggested with the exception of deburing the transfer ports.... i only had a file at my disposal....

[@frankcrawford416]

What a fine tutorial on 2-stroke porting.

[@YorHighness]

Remember these are crude chinese engines and his port work od excellent. This isnt rocket science. Stop hating.

[@Visiorary]

Holy [Bleep]! Get Juiced! I final wash jugs (especially 2 stroke) with scalding soapy water. It dries fast. Pistons too! Two Stroke is Heaven!

[@sailingvesseldrifter1759]

Come on guys. Cut him some slack. I get the strong reactions but who was perfect the first few times? I fully understand its best to be precise and have proper tools. However give credit where credit is due! Hes at least trying. The difference between my first build and my 3rd and current build is unbelieveable. Some of us are self taught. Take it with a grain of salt. Or leave it. Better question why did you finish the vid then waste more time leaving mean comments? I may be female and self taught but i bet my bike is faster than yours!! ;)

[@chrisnapierutube]

Yes that's all well and good, try away on your own project , but maybe only advise others on things you are really expert on? Balance is very important and a lack of it will put undue stress on components including the bearings, ( I imagine there are some ?) I've not bought one of these engines yet. BTW your bike looks amazing.

[@nateandyourmom]

I just went to the comments first.But i see.Guess im on my 3rd build.First engine works,i just took it apart to tinker with it .Im new to this but want to learn.Couldnt i just take that engine,watch some porting videos then just port that s.o.b?Have that 3rd engine on the way.Or should i try porting the new one coming?Or should i just go back to kicking fucking ass!Mr.60

[@windshieldrepair5961]

Thats a nice trick.....with beveling the pistion and cutting out portion to increase fuel delivery.....Id like to make the changes when I put my new piston in after some use.....

[@stevesolo16]

The best tools to port with are from FOREDOM. There is a company called C & C enterprises who sell all the porting tools you'll ever need. Start w/ a 90 and a straight. I have been porting all my adult life. I have set 14 Land Speed Records on small bore 2 stroke engines I have built. I 've done karts, GP Road Race motorcycles and am currently doing drag race V8 engines. It's a good idea to study the mechanics and theory on how the gasses flow through the engine. You need to get a real grasp as to what happens in each port as the crank turns.Do the gasses flow front to back or back to front? How to build a pipe that is going to help you achieve the powerband and over rev...porting to that pipe. What about the head and squish velocity? A good pipe and good head work...along with jetting the carb correctly will net you more power than a port job. The porting is just icing on the cake. I hope this helps. In college, I studied flow dynamics. I fell in love with physics from 2 stroke motor building. Good luck! And chamfer those ports!

[@MattDemery]

got a video that better explains how to do this?

[@chrischarters376]

Steve Solo excellent constructive comment. I agree 2strokers can be extremely inspiring!

[@theespinozagrove]

What’s the best way to get more power out of my 150cc gy6 Engine thank you

[@djstl100]

While im not a two stroke expert, im trying to learn some stuff about motorized bicycles before i build one.....and all i see in the comment section is... "your doing it wrong"... so i went to there sights to look for there 2 stroke engine work and all i saw was videos of other people doing stuff ,how to get through video game levels & shit....trolls...good work.

[@JuiceMotoParts]

I believe i saw one of those before on KZbin. some guys made a prototype with two carburetors wired to one throttle. It was pretty cool.

[@9014jayvictor]

lower the in take raise the exhaust ramp the transfers and chamfer to avoid ring breakage buy the window piston and the reed cage

[@xxkillersnakexx]

I find that porting and polishing does increase overall performance based of of my own personal experience and the videos I’ve seen on KZbin. Another benefit to these motors would be to ensure that the cylinders have been honed for a more advanced oil saturation on the metal surface to increase overall lubrication since you’re increasing the surface area by using a honing device.

[@sesquipedalianstan]

Your knowledge is so extensive it is RIDICULOUS.

[@JbassPlayer28]

you have one thing mistaken: although making the intake port rough will increase fuel atomization and may slightly increase efficiency, it will actually hurt power because it decreases volumetric efficiency (breathing capability) of the engine

[@robertsmith5323]

BINGO

[@neibeezy3587]

hey man the link doesnt work?are you able to fix this.really keen to do this

[@JuiceMotoParts]

Thanks a lot Daniel! Means a lot to US and we are always glad to help out with any problems you may have! Good luck!

[@signalhillscooter]

Something that needs to be looked at if you are going to do any porting or casting flaw touch up is to port match the intake tube to the cylinder. On a lot of those motors the intake tube shape and port on the cylinder don't match, killing the flow from the carb, rendering a lot of the work to the cylinder ineffective. And port match the boost ports to the base gasket match the gasket to the ports on the engine case and then match the boost ports on the base of the cylinder to the gasket

[@amymck6410]

Great video, but " Taking meat off the top of the piston" Squish is mega important and so is a crisp edge on that piston to control port timing.

[@crobulari2328]

Measure from the bottom of the stroke to the top of the cylinder. The top of the exhaust port should be lifted to about 2.5 mm under half way. Do Not go to half way !. The flatter the top of the exhaust port is the better but for longevity it is a compromise, so keep a little radius here. Lift the transfer ports by the same amount that you lifted the Ex Port. You can if you are able to do it, make the tops of the transfer ports where you lift them into a Y shape. When your engine starts to crackle you know that you are on the right track. Loads of experimental work here. Loads of work and expense as well. Make the expansion chamber out of thin material so it can "flex" under the + ve and -ve return pulses. Return pulses at high revs are supersonic so get your ear protection on !!. Good luck.

[@andymandyandsheba4571]

chamfering the ports and the skirt of the piston on the induction side will also will rising the compression by having the head skimmed also might be worth finding out if you can get a reed valve set a tuned exhaust would help a lot

[@jameskendrick41]

If u want to port make sure to also stuff and flow your case. Also index the spark plug.

[@MaksGarmata]

it's the best vid about the porting that i ever seen

[@roudyroy1]

if you were a blind man....

[@MaksGarmata]

roudyroy1 you can do better?

[@michaelmayo4258]

do you have a video of building 2stroke bicycle motor to being faster

[@antoniogonzalez5826]

I'm learning too. Thank you!! Good video.

[@garyschoeller8769]

personally I was just wondering about the transfer port casting burrs, 2 stroke have not been my forte I have had other engines that have similar castings but were made that way on purpose for swirl flow or hard roll fuel patterns weird but true. so this answered my question it is just crappy QC on the transfer port

[@RevAldea]

Hey, dude, you need to teach them jack the cylinder up via a shim between cylinder barrel and the crankcase and only clean the ports not raise them by cutting you raise the exhaust you must always raise the transfer ports too b y the same amount as you had the Exhaust by nearly half the difference this the real world facts, not just theory. Example: stock exhaust port timing was 155 and @ 102.5 degrees after TDC. Then you are raising the exhaust port to 180 degrees and @ 90 degrees after TDC. Stock transfer port timing was 77.5 degrees and @ 141.25 degrees after TDC, Then you raise the transfer port to 90 degrees and @135 degrees after TDC Getting these three to five ports dead on the money { respective degrees } is really super hard to do, all the while polishing these to not cause twisting of the piston ring causing fails on the piston anti spin pin, HEY Dude! You are Super lucky or you are the best cylinder port polisher I've ever seen. All in and said I've been doing ports on "Two Stroke Spark Ignited Brayton Cycle engine" some 20 years. And I have not been able to keep from spinning a piston ring at some time after years of trying I found taking up the cylinder is the only way not to spin a piston ring Oh yes the rings do have pins that keep them from spinning but that only works when you are really well experienced at doing the porting stuff otherwise it just keeps pushing on the piston's antispin pin until it loosens up and drops out now you've got a little pin floating around the engine if it goes out the exhaust port that three times air pressure and three times volume will, at some time or another push that pin right back in to the cylinder which will either hang a port edge smash into cylinder head and piston crown. none of these are good for engine life and the safety of the rider. I've had a cycle to lock up at high speeds but this was due to spark plug insulators breakage which was caused by the detonation also being the cause of not high enough octane but early on I had piston pins get loose and hang in the transfer port and piston this was a motocross track and was going about half T this kill the engine anyway. even bent the rod too. You want to test an engine run it while then look at the piston antispin pin in those ring groves if it is a good builder it will show "NO! WARE" on the piston ring ends right where the piston antispin pins contact the ring. If there is were there then the engines just do not last long either. This also the real reason the not use hard cutting stones hones on to cylinder rebuilds you must only use soft cutting stones on all two-cycle engine yes this means same types of diesel engines too.

[@gkcoupe]

just wanted to say thank you for postion this video the bike gained power all around and now revs more like a chainsaw than a bogged down P.O.S ......lol...... i look forward to any new videos you might post..... especially one of a running bike you upgraded and a top mph.

[@JuiceMotoParts]

at some point i will post my personal bike and it surely purrrrrrrrrs!

[@gavicada1772]

So if gas go in crank case better make smood intake so fuel go easy in and lub parts when finish it will be atomized i think but we need to see some tests

[@Sonoknow]

Nice job

[@osaelbarrantes8060]

I wonder if raising the exhaust port could damage the cylinder at high revs per minute, as it gets so close to the limit.. I suppose you must not file so close to the limit.. Am I right, and does porting force the engine to use more gasoline??

[@iownudie108]

How well can the transfer ports be reached with such setup (dremel's flexshaft) and what tip to use when doing that? Ps,you shouldn't raise the intake port,you should lower it so fuel mixture can reach the cranckcase earlier :P

[@troymays6300]

Got to think is a kid doing it the new generation most do things backwards but at least ain't playing video games all day he's at least trying just need someone that actually knows mechanics to tell him the right way to go

[@GadgetAddict]

Very interesting. I can't imagine that I'd need more power out of my 66cc but it's still good to know.

[@aviverde9031]

@@santanazachariah2470 wOw ThAnkS gUyS wHeRe i hAvE tO pUt mY cArd NumBer dOwn ?!? :(L):(:):))):): pricks.

[@jgbelmont]

What are your timing numbers? What is the bore and stroke for the cylinder you are working on?

[@reallee5331]

What kind of solder would can you use for a crank case bolt . One of the threads that hold crank case prongs stripped.

[@dailegribble9842]

Porting and polishing is very important in achieving a crisp rpm sweep in any high compression engine weather it be 2or 4 stroke the small pitting in the intake port can and will collect fule wich will cause premature defamation and if this occurs during the exhaust stroke this can lead to premature ware of the rings and cause blow by and cause bearing and or lower end of the case to become brittle and crack never remove material from a piston as this will cause week spots in the piston and more then likely cause the conecting rod to push up and threw the piston and can cause poor combustion cloging the intake and exhaust. Ports causing even more Los of power if u want to gain power there are dished pistons for these motors that will give you more power and best to upgrade to a exapantion chamber and go up a size or to in ur jet size also to adomize the gas just go to ur local hardware store and buy small fine copper mesh and use between intake manifold and jug with porting and polishing both ports will make noticble and reliable power

[@str8roller_6801]

How would I install the mesh without causing an air leak?

[@johnbasten4077]

Spot on Christopher

[@TheDanielroberts]

Wow, this guy is a genius, I anticipate a comeback of two strokes due to the improvements that this one person has made towards an otherwise defective engine (obviously manufactured by complacent hacks). Is it possible that he has deferred from NASA to pioneer in his own expertise (the blue gloves were a giveaway). Gremlins are the cause of the scoring in the cylinder and shoddy workmanship, also the cold and flu medication he is taking is responsible for making him sound like he is completely clueless. All that aside, the man is truly advanced in 2 stroke engineering.

[@pjneslo8979]

TheDanielroberts- Do you actually think you're funny or being cool? Post something that makes you the fucking expert you claim to be or how about just keeping your ignorant comments to yourself.. The Balls of some people, fucking hypocrites!

[@chrischarters376]

Tosser

[@johnt634]

It's sad when you are to dumb to know that you don't know jack. Give the guy an e for effort . Most of these cylinders are crome lined, that flake easily. The next hot tip will to be chamfer the rings, so they won't hang on the ports. Relax people, we're just trying point out errors.

[@talkinglock]

what is the song at the start? i like how it sounds!

[@OGMR2COOL]

HEY THANKS 1 MILLION FOR THE INFORMATION MAN I'M ABOUT TO MAKE MY MOTOR BIKE STUPID FAST!!!!

[@hakkedbitchhh7686]

Great video, excellent attention to detail.

[@Electrocycle300]

this is GREAT! thank you! Now our customers wont have to bother buying them from me, arrow motorized cycles, CR machine, or DAX! what a great thing you're doing here! and we wont have any work to do!! woo hoo! like a vacation from all that awful work! now, do you have a video on not having to continue paying our bills?

[@aaronreid5789]

you can also deck the cylinder to

[@JonathanShawTheCulturedBrummie]

subscribed. first video thats actually taught me how to port and polish the two stroke. ive got a 1990 Yamaha RX-S 100 that i want to chop down and modify into a dual purpose scrambler/cafe racer. do you know anything about modifying forks,swing arm. upgrading shocks and raising seat height?

[@warphonesS22]

Hello I need help! The kit I purchased won't run right. I took off head and noticed that at BDC MY INTAKE ports are not visible. Is that normal? Did the wrong piston come from factory? I have the low hole piston. I can't find information on intake ports and BDC. Or pictures of BDC with piston relative to ports position.... The motor would start but not rev past 1000rpm felt like it was starving for everything.....

[@warphonesS22]

Lol people are so butt hurt about this video. Complaining about everything. But people remind yourselves! These motors are $100 from damn China....... Anything you do is going to help increase power and efficiency. These motors are not freaken Porsches.. they are dirt cheap toys.... They don't need rocket science to run better.....

[@codybain2955]

i had to cut off and file them flat on the bottom of the jug to make it fit onto my motor, should it still work? it will only fire if i dump gas down the carb :(

[@TheFrank5767]

I notice you are using a GT cylinder I only use the GT5A that has a 40 mm intake bolt spacing and a matching reed kit !What is the torque you use to torque down the head ? I was hearing 120 inch pounds and 80 inch pounds for the aluminum Fred head . what do you torque your heads down to?

[@StephanSmith-sm7oj]

Hey man that link in the description isn’t any good anymore

[@TulioGreenWizard]

whats the correct porting and upgrades needed for perfect hill climbing? (45º hills, rly steep ones) i wanted my 66 to be able to climb a hill without pedaling, in which is not the case, it cant in standard factory state

[@mr.motormaster9881]

just a little porting makes magic 💥💢💫✨🌟

[@lilman1796]

Thanks for the video, great info. Keep up the great work everyone ☆☆☆☆☆☆☆☆☆☆☆☆

[@jsollien127]

Good info. And all in one take!

[@thecbc7658]

Hey um wouldn't grinding away only one side of the piston make unbalanced which would result in wear and tear of the piston walls and rings? What is your opinion on slipper pistons?

[@justinchampagne2818]

want to hear your opinion on this rod to ZMN80 I never seen one of these rods you know anything about him I got one on my engine

[@gunnyusmc89]

listen my bike is running extremely good on the top end but my take off is kind of sluggish can you advise me on my next course of action to fix this please advise

[@patrickwoodward6597]

Thanks. I have a extra motor laying around. is it okay to use the top ring only? (I broke one)

[@damnthiccassboye7138]

is widening the exhaust port going to make the piston ring dilate and gaught into it??

[@marthamryglod291]

There's a limit to widening but it's not a problem on these jugs.

[@mikecyanide7492]

Balance is everything! And a square exhaust lol

[@paullynch7672]

I'd like to see some work done,,,

[@davidgiffordsr.930]

When replacing the piston on a 49CC engine, does the "3" on the top of the piston come closest to the Exhaust Port?

[@YorHighness]

Piston ring pins toward the intake ignore any other symbols.

[@JS-fb6ww]

Do i need make a third transfer port on the cylinder for my rse reed valve setup and windowed piston?

[@johnt634]

Some call it a boost port.

[@gkcoupe]

but was able to do 90 percent of the things covered in the video.... i even widened the gap on the piston where it opens up for the transfer ports directly below the pin on both sides.... i port matched my intake and exhaust as well as widened my gaskets to better fit the flange for both intake and exhaust....

[@Ro-Bucks]

Another way if your on a bug and don't have the tools for porting. Add an extra gasket or two to where the jug meets the crank case witch will raise both the intake and exhaust but then you need to save the top of the jug and head a bit so the piston come back to the top of the jug. I didn't explain that well sorry

[@MrJameslewis530]

what do you think about Lucas 2 stroke oil? is it really better? thanks, Great Videos. I liked and subbed, and viewed about 10. very informative. i'm the only one on KZbin with Wheelchair wheels on a motorized bike.they work incredibly well. 8^)

[@jamest.5001]

what's the name of your channel? I'm gathering parts for a motorised bike build project. I have a 26" mongoose. with full suspension. and I'm trying to decide weather to go gas or electric. or both!

[@mikesousa5298]

Right on thanks man! Now I wont have to dish out the cash for a jug from arrow! Haha

[@l.shumkov7468]

so which side is it? exhaust or intake ....... ??

[@tjdukes7452]

Can u plz tell me what the number on the piston means mine has a 3 on it ....i need to replace the cylinder i wanna make sure to get the rite stuff ....its a power king kit ....

[@d4rkhound388]

+Tj Dukes 3 is probably just the different CC's the manufacturer had for the engine.

[@tjdukes7452]

+GHOST thanx

[@jayvlog9841]

You how to asssebly that exhast

[@Snatch19882]

Dwainpipe 21 is right, raising the exhaust port lenghtens the exhaust port cycle.. and btw Dwainpipe raising will "always" give you more power ,but your right ..you can raise it so much, than you hit the limit of what your exhaust can correct.. and you lose compression by raising the exhaust port.. So there is a limit! And the guy complaining about giving secrets away.. boy i would not like a cylinder ported by your company..

[@Joe_Rebel]

so u can round it and piston rings wont get caught?

[@integrationofmanandmachine4714]

Next engine honing?

[@brendvandenbussche2665]

Can you reuse the head gasket?

[@JuiceMotoParts]

A few comming out in the upcoming week or so. Stay tuned!

[@RJ-zr9ss]

Thanks for the info, and trying things out. Wouldn't an easy thing to do just be adding a bigger carb and tuning it? Like put an 80cc or 100cc carb on a 50cc engine, to get more fuel and open inlet port crossection too?

[@joshuaireland5181]

+JuiceMotoParts what if your exhaust port is round?

[@honorb4glory606]

You should clean all your individual engine parts, with warm soapy water, before assembly. This will get all the dirt, dust, metal, and grease off; which prevents damage, and gives the oil a nice clean surface to stick to. Never use solvents, as they can penetrate into the metal, with several negative side-effects.

[@kennycayocca5658]

Use Tide to wash. Parts.

[@markplaylist5984]

I've never used soap, just shop towels degreaser wd40. I'll stick to what I know.

[@P8FPV]

Wouldnt that unbalance the piston?

[@maxlvlnpcboss4812]

Instead of modifying the ports I would just shave a little off the bottom of the piston so the ports are actually exposed all the way. Messing with the cylinder seems overkill and you can easily lose compression and ruin the engine if you don't know what you're doing.

[@IamPzo]

what if transfer port wall break

[@str8roller_6801]

I'm interested in more fuel, without changing the timing. Would it be beneficial to just widen the intake/exhaust, and not change the height?

[@williamhart1125]

Great tips, I LIKE IT

[@jickdawmonelason7239]

Well you're a moron...

[@miguelhuertas7769]

hello is true when you porting you always go down never up

[@sidecarbod1441]

"The higher the exhaust port the less time that its open"....er I don't think so!

[@hafiz20115057]

Sidecarbod yeah its actually true ,there are two openings ,the one on the up and down .

[@johnt634]

Raising the exhaust port increases the dwell, opens earlier and stays open longer. This will increase rpms, at the expense of bottom end torque. Also the radius you speak of is called chamfer, not camfer.

[@billtucker9455]

Thank you

[@seasonedtoker]

Beware, carbide bits will chip nikasil off cylinder wall

[@turbotonic27]

very informative video ! great thanks

[@freepatriot6313]

+turbotonic27 actually....no very destructive and totally wrong information. If you follow this ...you will be replacing those cylinders and pistons...and probably crankshafts as well

[@davidjsherwood]

any videos of your results?

[@jasonsweet1868]

Does anyone know why reed valves work

[@sammyrussell936]

Awesome Info..Thanx Bro

[@RevAldea]

Then students need only to port the "inlet port" of "piston inlet ported engines" where you can grind and almost leave it in an unpolished state for test reasons until you have done then finish the polishing of the cylinder edges. This place is not ring touched In almost every engine I've ever seen. But always Clean the metal particles out before starting the rebuild your engine. For that matter just clean the whole engine's part completely, then "Do the whole Rebuild" completely.

[@JParkes43]

Good work

[@AlvinSmith]

great job.

[@roudyroy1]

dont take anything off the crown of the piston... bad bad bad you have just unbalanced it, do it all via ports.same as the skirt.. it provides stability on a 2 stroke piston. intake ports should be smooth, you want to reduce turbulence in the ports. the a/f mix hitting the crank counter weights is more than enough atomization. if these cylinders were plated you would of destroyed them. if you guys want power, look into timing advance, REAL porting, shaved heads and bored carbs. then jet right and put a good tune pipe on it and your rocking.

[@MattDemery]

do you have a video that can better explain this?

[@samuelburkett9053]

6:18 thats the intake port not exhaust

[@rodwilson2114]

read power tuning two stroke engines,.....it will explain all

[@robertwent4859]

Where can I buy replacement parts?

[@hvguy]

ebay

[@iHeartKawasaki]

If someone did this to a true race 2 stroke I would cringe. I'm not sure if air cooled weedeater engines are nikasil plated, but race bikes cylinders are. You round the port edge at the cylinder side and you're going to start running into HUGE problems.

[@hvguy]

its a 50cc scooter engine, it costs $20... what race engine do you know of costs $20? lol Jeffrey Collins

[@iHeartKawasaki]

hvguy I suppose the price isn't really the concern here. It's the fundamentals of how to engine works. Granted, yeah, its a little easier to chop at a $20 cylinder, instead of an $800 cylinder.. but still, You're asking for problems by eating at the cylinder with a dremel. My comment was directed to the youtube kids with a RM125 sitting in the garage and they're trying to squeeze more power out of it. Just kind of a warning more than anything.

[@TheDustyShredder]

now, i do hope you realise that these cheap cylinders do have rough edges, and your race cylinders do not, right? therefore, you have to do a bit of finishing of the ports like he did, and you do have to round and smooth a few things out. the piston however, is a moving part and should NOT be touched by anyone BUT a qualified automobile mechanic.

[@ANDROID204]

A qqualified automobile mechanic ? I would say anyone that knows their shit. This is not rocketsience

[@iHeartKawasaki]

Some old 2 stroke engines have "Softened" port edges to accomdate loose floating rings, however, these modifications are made from the factory, with specific tolerances. No part of that, is anywhere near is barbaric, and as brutally orchestrated as what is shown in the video. The work done here is comparable to "decking" the head with a orbital sander and side grinder. And the power achieved is minimal at best, and stupors in comparison to a simple carb adjustment, better fuel and pre-mix. I don't care what someone does to their motor (because most of the time, when they mess it up they pay me shop-rate to fix it).. but I'm trying trying to save someone the hard found learning curve involved with destroying a perfectly good cylinder.

[@miguelcontreras192]

What top core is that