How To Port Your 2 Stroke Motorized Bicycle Engine- The Basics - Get Improved Performance 

A little advice for your viewers on changing the port widths. Make sure the cutouts in the sides of the piston, if it has any, will not allow the air fuel charge out of the port at any time. The easiest way to do this is with the cylinder still on the engine. Put a pencil point on the side of the port, and rotate the crank a few times all the way around so the piston rubs on the pencil as it goes past. Do this to both sides of all the ports you intend to modify. Remove the cylinder and see where your pencil marks are on the piston. You can widen the port so the lines are at least 2mm from the cutouts. Also, increasing the port timings by 1mm or so could make your engine have little to no bottom end acceleration. These mods could still have adverse effects on your engine's performance, so tread with caution. If you cannot afford to junk your engine, don't touch the widths or timings. Stick with cleaning up the trash! You will be surprised at the improvements that alone will make! Remember, air is like a fluid...easier in, easier out. You may also have to richen your jetting. Research reading spark plugs and piston wash. When in doubt, add more fuel. Start rich and go from there. I like your Happy Time Harry, Meatwad, and Mighty Mouse tattoos! Probably not too many people even know who they are or where they're from though... :(

My neighbor just brought me a broke down bike with a seized clutch. I ordered a new engine kit for it. Gonna follow these instructions before i ever run it. TY!

1 minute in and hes told the experts to cluck off, i like this channel already

Great video brother....I've been building and racing drag cars,, bikes and 4wheelers for 37 yrs but only 3yrs on these little engines and it's amazing how just that little bit of cutting that you showed makes a huge difference...all the yrs I've been building engines and working in a automotive machine shop I never worked on a 2 stroke all the bike and 4wheelers I drag raced were all 4 stroke so it's been a learning curve for me...lol but u really enjoy it...I'm to old to be going crazy fast anymore... those are great tips ..... thanks for the video brother ...

Your explanation of how to port and why.... It's amazing. And easy to understand. Thank you for your videos. I gotta say, you and LA hover bikes make great videos

On my 3rd engine 3rd winter working on an engine. Many times watching this. Love the honesty with you. This works

Hands down the best video out there on porting .. many many thanks

So informative, been building these bad boys with spare cash for two years now. Wish you had posted these videos earlier, my old builds are getting tune-ups I hadn't imagined possible! Sub from me, thanks a lot!

Badass demo! "Big ass hole" I just got extremely neglected motor bike, I'm watching the heck out of your videos! Thanks because it gives me experience before I experience it for myself. This is really a great idea, just for the fact that it should be done to maximize the efficiency of the motor. Awesome thanks.

ive learned more in two videos from Hugh than I did in two years of owning a gas bike

For all those that don't have a ported cylinder then you should buy one from this man because it makes a big difference!!!! He's also very professional. He answers all your questions and ships it out within a few days. I also have another bike I can't get running right and he offered to fix it for free (not counting shipping) on his channel

Imagine being one of those motorized bike guys/girls who always feel they’re entitled to be negative to others just because they do the same thing differently from them just sad he’s no expert but you know what you aren’t making videos he is show the man some decency and a pinch of respect.

*This guy knows his stuff. He Talks my language. WTf do I wanna go 70Mph on a flimsy bicycle for??? Id rather be safe do that speed on a cycle & stay under 40on a bicycle*

You're a great teacher man . That all I want to do is clean it up . 👍👍👍☝️

good stuff bro. especially .know u get it when u metioned cross hatching

i like how straight you are, really educative video, thank u sir

Thanx. Great vid. Just getting into 2 stroke bikes. Love the tinkering.

Perfect beginners guide, Good job!

Hey just ported my cilender and it is so much faster your videos really helped me out. I am Getting some parts In the mail. Should go 45mph.

Love your show helps me a lot

Great video ! Thanks for the tips

Great practical advice

Love your videos, lots of good tips and lots of information,

You have awesome videos...Thankyou I appreciate and love them.....

Super helpful. Thanks

Great tips. Thank you.

You are doing an awesome job thank you for the video it helps a lot

Thank you sir for all your videos 👍

That was the most amazing demonstration on how to Port these little cylinders ! Thank you very much! My only question is… how do you know you have hit the 1mm spec?

I always wondered about those transfer ports , they allways looked like they had more potential

That little all in one grinder is awesome. Never seen one of those!

Great video, thanks for the tips :)

I have a ported 50cc. Its intake port is HUGE that you can fit 2 fingers easily. Even the exghaust port is big. My daily 66/80cc you can barely fit 1 finger inside the intake port.

Friends, that is some good porting!

This guy knows his shit has helped me with my engines just from his vidioes! No air filter made my bikes run smoother and faster and I could go on and on but this guy is the best of the best and without his vidioes I would have been done with this hobby years ago

Packed in everything we needed to know about 2-stroke engine porting. Great video!

Great video

2StrokeStuffing recommends to use a Stone based grinder, so to not grab a chunk of the Nikasil (anti-wear bore coating).

Hi Eugene, my 80cc kit Just arrived and I’m wondering. I’m going to take the head off because I have a CNC racing head and I’m also going to take the barrel off to have a look at the intake holes. I will use a Dremel and then what grade sandpaper wet and dry do you recommend to finish the barrel with please? Then I see you finally finish with a supermarket green scour pad. Mainly wondering what grade sandpaper to use after the Dremel before the scourer please. Thank you mate. You really have great no-nonsense videos.👍👍👍

Thank you Eugene! You do an excellent job with your video series. Your techniques here have worked for me when combined with carb tuning and a tuned exhaust. Take care.

Thank you good stuff

Anybody who gets one of these cylinders, you really NEED to get in there, at least with a small file and de-burr those ports or those chunks will enter your cylinder and shorten the life of it by ALOT! I failed to deburr my Zeda-80 kit I had gotten since it came fully assembled, I was replacing the jug two weeks later!

Very cool n useful. How much do you charge to port n polish cylinder n block

Awesome video thank you for the tip 👍😘💋💯 🥰

Hi Eugene, thanks very much for all your help lately. But can you please tell me what you mean by a plug chop please. Can you please explain to me how to do it.. as I am replacing my cylinder, piston and rings thank you very much mate. you’re a legend. 👍

*Very helpful. I sure the hell dont want to go 60mph on a Bicycle, But I do want as much safe & free/cheap power & performance as I can get, or else I would just buy a cycle for $1300*

Hi Eugene. I am cleaning out the rubbish in the intakes and lowering the intake and raising the exhaust by 1 mm. So when you say you can leave the carburettor intake slightly rough, how rough do you mean. Do I still need to sand down the carbie intake or can I leave the little grooves from the Dremel in it? And just sand the exhaust intake smooth. Or do you recommend sanding both intakes? Thank you so much for all your help!👍👌

i loved my little harbor freight bench grinder. too bad they don't sell a replacement shaft for it. i was using a cutting disk and it locked up and twisted the flexible shaft to the point that it kinked up and broke. rip

Great video man

After porting can i just put cylinder back on with piston and fire up after tunning and doing my standard plug chop and niceties no timming right?

Hey I was wondering if I should cut the exhaust on my stock chrome exhaust from an engine kit? How would it benefit my ride and is it worth it?

Thank You Hughes. You know your stuff. And how to do this shit with trash motors. 8-) That's what those kits really are.

For my weight and height with tool bag I need atleast a 100cc to get around because of the vertical requirements of where I live

15:03 idk i wouldnt call that small personally, i think thats a decent size, the perfect size in my opinion, maybe even too big and it can definitely get all the way in there, further still

I have a 1948 whizzer how do i gain sppeed changing tires of course or pullys and sprickets ik asking ,me hanically shaving the head .and shorting the rod ? Please ,thank you .your a great teacher .!by the way !

What type of Polish do you use to Port intake and exhaust thank you

I wish I had watched this before dogging out my new build.

Would a simple debur tool work? Or would that screw with gaskets

So is this like a Chinese chainsaw ware you can delete the base gasket for more compression? Also what are some good timing numbers, I know my Chinese 58cc saws love 158°int and 100°exh

I loved your comment about (if you don’t have anything positive to say then just don’t comment at all) I like how you put it, so gentlemenly a big 👍thumbs up. People can say the MOST STUPID THINGS

Thank you Eugene! Your videos are awesome. Well done! Agree, don't need to go fast on these motors. I live in a hilly neighborhood, and think cleaning the junk out will help as described. But, do you think I am better off not to take 1mm off on In/Out ports, so I don't lose the bottom end torque? I also don't get a smooth power flow, and the motor is past breaking-in period. I did follow your "needle set" video for the carb, and it seem to help somewhat. Much appreciate your feedback.

I made the piston hole bigger because someone told me that would make great boost, but now it’s not starting? Maybe I need to add more oil in the gas or use 4 stroke oil right in the exhaust intake because I have heard that fixes it, any tips?

Is a pz19 the proper carb for an100cc ? And could I put a pz20 on a 100cc with any adapter?

Where did you bought all in one grinder and the vise bench holder

Stay safe and ride safe scoot scoot around 🥰😘💋💯🤗

I am wondering why you didn't show yourself using daikum to work inside the cylinder you are 1 mm? You know hopefully what I'm referring to measuring the cylinder where you want to Port it out to

​ @Hughes Motorized I have been using BPR6HS spark plug is it good and it looks the same and it works well in my engine. And one more thing is iridium spark plug okay to work in the 2 stroke engine spark plug 1 BPR7HIX iridium cost $25 here spark plug number 2 BR8HIX iridium cost $41 here so which is the best can you make a video on about this spark plugs and tell us if it's better to run on a normal plug or iridium

Do you advise waiting till after running a tank or two for break in first before porting the cylinder out? Or is it fine to go ahead and port match the exhaust and intake before installing the motor (before break in or running at all) thanks @Hughes Motorized

Just took mine apart today still in break in period the piston rings and cylinder where broken:( should have done this before ever starting it

I hand sanded some of the cylinder because my dremel slided when I was porting and caused some small scratches / pits in the cylinder. Some are saying that the interior of the cylinder has a special coating and that sanding the cylinder would ruin it. I used 150 and 300 grit sand paper. Do you think its ruined? edit: looks like the cylinder is 100% iron so theres no coating and therefore no damage via sanding, however I still got some small pits / scratches from my dremel sliding off and hitting the cylinder wall. Think it will cause any issues?

Can I send in my yd100 head for.you to port? How much would you charge ?

It seems to me that it would be better to use the little abrasive wheel it would be safer to take away the burrs then you can go ahead and polish your all your ports. IT WOULD BE MUCH SAFER

Yup the intake an exaust ports definitely are not nice an smooth like a factory engine Honda Yamaha an such lol I'm on my second build the first one was a learning curve cause can fix dirt bike an sleds no problem however these motors have many little- flaws with lol great for kids to learn about engines though an tinker with second motor I bought I just bought the engine with no hardware its all cheap junk lol I'm gonna order the drive chain an stuff from the place i order dirt bike parts that's what I ended doing with my first engine build the parts are much more durable especially the drive chain I can break the chain with pliers that come with these kits lol can't do that with a real dirt bike chain though I paid more the chain and parts but least they last alot longer they can keep their cheap hardware lol choke socks too vibrates down a chokes the engine I put a carb with a pull out choke my buddy races after we ported his srx 700 snowmobile he took a center punch an put a bunch of punch marks on the intake side for fuel dispersion we shaved the head also I wonder if there's any room to shave the head on these down a thousand of an in h

Will a 80cc motor run if the cylinder scratched a little bit?

Will this make my 20mph 80cc 2stroke bicycle go 40mph ?

Good info although somewhat mislabeled. Porting mostly refers to widening and/or raising the ports right at the cylinder surface, not cleaning out casting irregularities.

I feel like he's fixed alot of expert fuck ups

Where did you buy the grinder and dremmel

And that was 66cc a 48 barely would get me up a hill my 66cc could climb the side of a mountain but I didn't go fast that for sure those steel stingrays are heavy for those engines

What happens if you lower the exhaust port instead of raising it?

I have a 4 stroke engine kit I lost the 5 8 bushing straight shaft where could I buy one n the bolt

You make everything bigger, but it doesn't make the engine better. It is important to improve the accuracy and direction of ports in this work. It is necessary to vortex the cylinder.

do you have to trim the gaskets?

What about a fixed head is it more difficult?

Cylinder Holden I really don't see how buffering the exhaust part to a mirror finish is going to give you any benefit

if you're poor or don't want to accidently nick the cylinder walls a file would work too, right?

Nice job man and that helps me do mine naw

I wonder how successful you would be if you remove the flashing with files and then port and polish with the rotary tool

I have found you are better off just widening the ports slightly and you keep the bottom end speed and keep and gain top speed to my bike is stock with just the ports done and I get 48 mph lol

I actually had a conversation with custom motorcycle builder today. I was going to ask him about porting and polishing my motor. Long story short, he said that at the most I should just buff the ports. But as far as going overboard there's really no need to. He said the only thing I should really worry about is the muffler and the carborator..... He had to have been telling me the truth cuz he didn't even want to do it for me. He said he hadn't even heard of anybody doing it for over 30 years ago....

When did a basic clean up become PORTING on these engines

So I did this and now at full throttle it almost dies and has no power? What could be the issue

So small 950 watt harbor freight generators head gasket and head fits motorized kits with little modification just drill the holes a little bit bigger to fit the studs I think the piston and piston bearing fit too the head takes a bigger spark plug just wanted to let everybody know just in case you have one mine didn't work I cannibalized it

70 miles an hour in reverse 😂😂😂😂 you got me rolling

Aqua Teen Hunger force #1 in the hood G!

wouldnt the heat from normal running....shave off those burrs on the insides?

@Whoop!

Does it matter if I have 50 miles on my motor and then port it

So porting is basically deburr sharp edges

13:17 "thats what She Said "