The most IMPORTANT 2 stroke porting rule I know... and why I STILL HATE aftermarket cylinders...

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  • Опубліковано 1 січ 2025

КОМЕНТАРІ • 208

  • @gasaxecustomsaws
    @gasaxecustomsaws 2 роки тому +11

    Thank you! I've watched countless hours on 2 strokes, not once have I seen this. Thank you, again...

  • @treewisemenllc7281
    @treewisemenllc7281 10 місяців тому +7

    This is one of the most helpful bits I've heard/learned about an engine in a long, long time.
    Thank you for this.

  • @brendanhayes2752
    @brendanhayes2752 Рік тому +3

    I’m not a professional chainsaw guy but I loved the cut away. That really helped.

  • @videoaustralia
    @videoaustralia 2 роки тому +33

    Im doing things with saws I never thought I would do because of this channel, you're an inspiration mate

    • @juledoren
      @juledoren Рік тому +3

      I just start cutting exhaust ports out😂

    • @StihlRunnin
      @StihlRunnin 5 місяців тому

      @@juledorenthink that’s where it starts. Didn’t last long hogging on mufflers myself before I decided grinding on the steel might help too.

    • @onemantwohands5224
      @onemantwohands5224 2 місяці тому +1

      Hey mate , checking in from brissie 🙌

  • @billylee2312
    @billylee2312 6 місяців тому +4

    Probably the best video I’ve watched on porting. I feel comfortable giving it a shot now.

  • @mikeaustin1788
    @mikeaustin1788 Місяць тому +1

    What about modifying piston skirt to open intake earlier?

  • @timothymilam732
    @timothymilam732 2 роки тому +3

    Excellent bit of information on that, and your correct on no one sharing information with anyone.
    I found that out years ago with the two stroke dirt bike engine builders back in the 70's and 80's.
    You would of thought you were asking for the secrets to understanding women, or how to convert lead to gold or something serious like either of those.
    So finding someone who isn't insecure about himself or his abilities to be above average in his trade craft is not the norm for such things as engine builders of any kind, especially preformance builders.

  • @2Cheap4society
    @2Cheap4society 11 місяців тому

    Great video, very good point you are pointing out! For those who did not catch the facetious statement about taking out the top ring and trying compression check, basically It is because the combustion chamber is not sealed. You have a few degrees of crank rotation before it seals. If it's sealed earlier in the stroke it would give you higher compression. Like he said it will run but the compression would be lower than if the chamber was sealed.

  • @edwinburns4785
    @edwinburns4785 Рік тому +2

    Thanks John....New to this porting hobby and this is the first I heard of this. Makes absolute sense. Off to the shop to check a 394 I have apart and waiting for parts. Thanks again.

  • @Ecksterphono
    @Ecksterphono 11 місяців тому

    Don't feel bad. I've jumped the gun once to on not checking the fitment and kicked myself. We all have our blond moments when not checking aftermarket components beforehand no matter how experienced. But at least we catch it before major embarrassment occurs if we would have assembled and ran it. At least you got on top of it. Great learning video for the novice and thanks for the heads-up.

  • @herbertsmith2640
    @herbertsmith2640 Рік тому +1

    Thanks for the information. I'm new to 2 strokes. Really appreciate it

  • @FYMM69
    @FYMM69 2 роки тому +2

    Truly appreciate the info. Info I would’ve never thought of after 45yrs of messing with 2 strokes !! Thank you

  • @matthewziegler9756
    @matthewziegler9756 2 роки тому +2

    Thank you for that! As a newbie at porting explains alot. Appreciated much!

  • @AndyH-13
    @AndyH-13 Рік тому +4

    You explain things really well, appreciated. Liked, subscribed and left a comment.

  • @Shiddyvet
    @Shiddyvet Рік тому +1

    This is an awesome video. I still don’t understand a lot but I’m learning!

  • @waywardshed9721
    @waywardshed9721 2 роки тому +1

    Those big bore kits are all problematic, good tips man thanks for sharing. Keen to see this running

  • @calebthacker2162
    @calebthacker2162 2 роки тому +2

    Wow I’ve never heard this…appreciate the share of knowledge 💯

  • @PolarisRider06
    @PolarisRider06 Рік тому +3

    Wouldnt this depend a lot on transfer port timing? If the transfer ports are opening before the ring gets below the top of the exhaust port that would allow the expanding exhaust gasses to push backwards into the case potentially igniting all of that as well as actually stalling the intake pulse if the intake port was on its last degree or 2 of being open.
    But if the transfer ports aren't open yet the expanding exhaust gases are still pushing only on the piston, creating power and the case volume is decreasing, which also stalls the intake pulse but its not screwing with the direction of air flow in the transfer ports, they are basically dead air.
    So the exhaust opening (ring below top of port) only after the intake is fully closed (skirt below port) is important because then case pressure is building to prevent reverse flow of exhaust gases when the transfer port begins to open (ring below top of port) which i would assume you would want to happen just after the exhaust cracks open so that the exhaust is starting to escape through the exhaust port and there is more pressure in the case that will force the intake charge through the transfer ports with more speed and expell the exhaust gasses faster
    But then theres the intake shit that needs to be taken into account... fuck.
    It's been 20 years since I've actually thought about 2 stroke port timing and I used to have the concept down pretty good and now I'm playing mental gymnastics once again trying to remember the theories on how it all works. Plus, I keep thinking about things that would apply with reed valve cases when there is an actual valve preventing backflow if the transfer ports are open before the exhaust is open...
    I wonder if I still have all of my notes on port timing theory, exhaust scavenging and expansion chambers, and all of the other shit I made copies of and printed out back then...
    Why the hell do I do this to myself...

    • @junkyardboost8372
      @junkyardboost8372 7 місяців тому

      The exhaust port always opens well before the transfers. This is called blowdown.

  • @JimmyOToole-bu5qk
    @JimmyOToole-bu5qk 19 днів тому

    cheers from ireland ,i just do simple porting on my saws but you really explained it in a simple way .thank you.

  • @charleimcdonald896
    @charleimcdonald896 Рік тому +3

    Good stuff

  • @sporranheid
    @sporranheid Рік тому

    Don't get mad, get even 😜 A great gift! Thank you.

  • @lachlanhawkins4236
    @lachlanhawkins4236 Рік тому +1

    Just compared a genuine to aftermarket and your spot on

  • @brub5174
    @brub5174 Рік тому +3

    Lowering intake for more torque. Highering exhaust for more top end. Damn dude. Thanks. You got a sub. Will try to port my own echo 3510. Not sure if I want it snappy or high end. Or a little of both lol.

  • @kraftzion
    @kraftzion Рік тому

    I watch a lot of saw modding channels and have never seen this. Instant new subscriber.

  • @chriseller757
    @chriseller757 6 місяців тому +1

    First I've heard of it so thank you sir

  • @pauldharmer
    @pauldharmer Рік тому

    First time here, have 2 031av saws to rebuild, guess I'll be binge watching for a while,

  • @Justme001..
    @Justme001.. Місяць тому

    Thank you for this info!! 🙏

  • @matthewknight5641
    @matthewknight5641 4 місяці тому

    Man i know you are super busy but id absolutely love to be able to learn even9re from you. I watch alot of your stuff and have just gotten into porting saws. I love my new hobby and i appreciate what you do

  • @walkerscountrylife
    @walkerscountrylife Рік тому

    Never heard anyone else talking about this and it makes total sense. Thanks for sharing, keep up the good work, appreciate all you do buddy.

  • @mbmcclure3579
    @mbmcclure3579 2 роки тому +2

    Thank you for sharing. Just found your channel today and subbed. I’m wanting to learn all I can and for somebody just starting this is very much appreciated information.

  • @geralddavis9236
    @geralddavis9236 Рік тому

    Good to see you back in action i wondering why I hadn't seen any of your videos

  • @TTisleofmanTt
    @TTisleofmanTt Рік тому

    Excellent vid.this is exactly how I work out what I can do to a saw.

  • @joepilkington1646
    @joepilkington1646 Рік тому

    This has just made things so much easier for me

  • @matthewnorris203
    @matthewnorris203 6 місяців тому

    Interesting. Porting seems like such an art. I like rules of thumb like this..

  • @shaner67
    @shaner67 Місяць тому

    Thanks John for the really important tip. Please don't even worry about the haters, just jealous of your skills and knowledge. BTW, would like to purchase one of the awesome 462 builds. Please message me on how I can get a hold of you.. all the best my friend 11:24

  • @yungsmile7546
    @yungsmile7546 2 місяці тому +2

    That's gold.👍👍

  • @Anthony071177
    @Anthony071177 Рік тому

    Very good tip I’ve never heard any other channel mention. Thanks.

  • @doingitwronggarage9651
    @doingitwronggarage9651 Рік тому +2

    That was a good tip. Thank you. Subscribed now. Always interesting to hear and see how you "over there" think about things differently. Like focusing on exhaust port opening and transfer port opening in the unrelated degrees after TDC in stead of total open duration that is based on degrees from bottom dead center.

  • @doglegjake6788
    @doglegjake6788 Місяць тому

    Thanks for sharing another cool video !

  • @williamgrissom1995
    @williamgrissom1995 7 місяців тому

    This is a great help to me. I bought 2 G111 saws and I considered cleaning up the ports. Roughish on the intake and polishing the exahaust. But I won't unless the saw is too disappointing.
    One bit of advice I got to make them run like the 200t was a gasket delete and to port the muffler.
    I'm not looking to make it a mini race saw. I just want it to cut as well as my 200t I use to have did. The 200t was brand new when I bought it and just stock.

  • @hansondan06
    @hansondan06 2 роки тому +1

    The amount of knowledge I’ve gained from this channel is insane. Thank you

  • @ronsilva516
    @ronsilva516 Рік тому +1

    Good advice 👍

  • @ronsilva516
    @ronsilva516 2 роки тому

    That was very helpful I kid you not that was very very insightful thank you 🤣👍👍👍👍

  • @helloallyouppl
    @helloallyouppl Рік тому

    Got this on my main feed, looking forward to seeing more content

  • @chrisjacobs2182
    @chrisjacobs2182 2 роки тому +1

    Thanks for sharing your knowledge to help us all out thank you!!

  • @adamspencer3620
    @adamspencer3620 2 роки тому +1

    That cleared up a lot of questions I’ve always had about the intake charge
    Without proper ring seal you have low negative pressure

  • @chrisseger6870
    @chrisseger6870 2 роки тому +2

    I learn something new every day, man. Makes me wonder if the first saw I ported (which I will never show anyone the cylinder because it's horrifying) had that issue on top of what I did to it...🤔

  • @Macgyver-ranch
    @Macgyver-ranch 2 роки тому +1

    Thanks John. Now I will have to check the cheapo big bore I pulled off of the 066 because of an odd miss. The intake was way too low out of the box.

  • @Hboysoutdoors
    @Hboysoutdoors 2 роки тому

    Thank you first time hearing that

  • @beekone28
    @beekone28 2 роки тому

    that is a very simple check no one ever told me on any channel! thanks a lot!

  • @ocsplc
    @ocsplc 2 роки тому

    John were with you 100% buddy. Thanks

  • @jonathanhalverson2380
    @jonathanhalverson2380 2 роки тому +5

    Thank you for the heads up John, I've been building and working on saws since I was a kid and I'm just now starting to mess around with porting and any other ways to gain extra power out of most of my saws or when ever I get new power heads. A lot of the stuff that I have learned is either from your channel or the IronHorse and I have to say you both have a really good knowledge on the do's and don'ts when it comes to hopping stuff up. So once again thank you very much for the quick awesome trick on how to tell if your saws going to have good power out of the box.Also at least that was an aftermarket head, but still don't blame you for being pissed off on wasting your time when you could have prevented it like you said.
    P.S. I like the video for ya👍

  • @kowski9477
    @kowski9477 Рік тому

    Great video man! I can absolutely understand what your explaining here and yes it makes total sense. Good job keep sharing your knowledge, thanks!

  • @1crazypj
    @1crazypj 2 місяці тому

    That is something that was talked about in the 70's, 'free port' where intake and exhaust can be 'open' at the same time.
    Even though I've never done chainsaw motors, 'everyone' tuning two strokes should know about it and check.
    In early 2000's when 'pocket bikes' were everywhere, tuning them was a lot of fun , guess they were similar to chainsaw motors?
    Something else people don't realise, every time you raise exhaust you lower compression slightly which loses torque.
    Majority of two stroke run a corrected compression around 6~7:1, I always laughed when people started saying they were running 'race gas' and 14:1 (or more)

  • @flakey7832
    @flakey7832 Рік тому +1

    we don't have this very cool saw modding thing here, but we do have 2 strokes so this can very well be applied to scooters as well, great videos

  • @timstone721
    @timstone721 Рік тому

    Great video and knowledge, I really appreciate this advice, thanks

  • @Kirks_Custom_Chainsaws
    @Kirks_Custom_Chainsaws 2 роки тому +2

    thank you John! as always.... you are a wealth of knowledge as well as a pleasure to watch. you're a 2 stroke magician man!!! Keep up the great work & keep the videos coming!👍👍👍

  • @rickfuerst
    @rickfuerst Рік тому

    I just ran across this video. I just happened to have a 046 & and a 064. I plan on some engine work on the 064. Thanks for the info. Great content! You rock!

  • @timcline2799
    @timcline2799 Рік тому

    Excellent site. Glad I found it. Thank you!

  • @martygoodell9287
    @martygoodell9287 2 роки тому

    Just came across your site. Impressed in the few minutes! Thanks

  • @leifmorris5114
    @leifmorris5114 25 днів тому

    Great video

  • @nip917
    @nip917 2 роки тому

    I learned so much from your limb reaper 200T, I was able to do my neighbors for him and he loves it. Won't even touch his stock ones anymore. You passed on the knowledge and I'm thankful.

  • @jeffwooton7138
    @jeffwooton7138 2 роки тому

    Thanks for sharing. Hotrodders will hotrod!

  • @cheeseymccheese7249
    @cheeseymccheese7249 4 місяці тому +1

    So at 8:00 specifically. Where and what would you grind out. Would you focus 75% on dropping the intake and then 25% on the exhaust or 50% intake 50% exhaust or 25% intake and 75% exhaust. Thanks!!, Hope you see this comment, its been over 2 years since you put this video out

  • @BigJohn_Browning
    @BigJohn_Browning 2 роки тому

    Thanks brother...I'm always learning from you...keeping it rowdy.

  • @justinweaver8787
    @justinweaver8787 2 роки тому

    Very cool information thank u 4 sharing!!!

  • @mm88swrt
    @mm88swrt Рік тому

    Well I guess I now have to go look at my saws lol. Never heard of this rule and I've been watching a ton of builders

  • @latinodeathjazz
    @latinodeathjazz 2 роки тому

    Well that explains a great deal. Thanks for sharing that.

  • @andrewslagle1974
    @andrewslagle1974 Рік тому

    Thank you for the tip ,your a big help !

  • @mechanech
    @mechanech Рік тому

    Thank you John!!!

  • @mirceastaicu4131
    @mirceastaicu4131 2 роки тому +9

    If only everyone would be as kind as you, and share your hard earn knowledge, we wouldn't be wasting thousands (if not more) of man hours. Sadly this happens in most industries, entire business models are created on asymmetric information. Thank you!

  • @customsaws
    @customsaws 2 роки тому +1

    Thanks for sharing. 👍

  • @jasonsayre8102
    @jasonsayre8102 2 роки тому +2

    Great info my man, we def appreciate the knowledge you share!

  • @scottwilson4396
    @scottwilson4396 2 роки тому

    Thank you for sharing that info John 🫶🏿

  • @grabo454
    @grabo454 Рік тому

    Thank you so much for sharing!

  • @allenbrown7820
    @allenbrown7820 2 роки тому

    Always learn something watching your videos.Keep up the good work.

  • @Op1zilla
    @Op1zilla Рік тому +1

    Thanks for that Tasty piece of info 👽👍

  • @RichFife
    @RichFife 2 роки тому +9

    Game changer for guys. Great Information!!! This is what helps everyone in this community. Thank You.
    John, what about a husky piston in that cylinder... it should have a higher top ring.

    • @tylerheard1279
      @tylerheard1279 2 роки тому +3

      Hell yeah! Makes perfect sense, just never thought about it that way.

  • @WildStyleWorks
    @WildStyleWorks Рік тому

    very nice hint, good video, thank you for explaining, i thing i am ready now to port my china saw just for fun 🙂 i made an evil pipe for it, i may make a video when i am done.

  • @lumbearjack3722
    @lumbearjack3722 2 роки тому +1

    Never heard this before. I’m interested if that’s why a few saws I’ve done don’t run as well as the others

  • @lessmith4974
    @lessmith4974 2 роки тому

    Quality info,cheers, much appreciated.

  • @LocPH.
    @LocPH. 10 місяців тому +1

    Not sure if I completely understand, but how does a ring that's too low while the intake is opening lead to "short circuiting" if the transfer ports are closed? I understand that the earlier you can get the ring to seal, the more compression you have, but what has that to do with the intake?

    • @1212zorz
      @1212zorz 8 місяців тому

      Glad I'm not crazy for having the same thought. Intake and exhaust being open simultaneously while transfers are closed would not lead to free porting. Unless I'm missing something major but spinning around my cutaway I don't see a problem.

  • @ppesquire
    @ppesquire 2 роки тому

    Great info. Thanks for sharing . It makes so much sense, now that you pointed it out.

  • @bmp0149
    @bmp0149 2 роки тому +2

    Really appreciate passing on of info. But I dont get this one.
    What are we saying the problem is with the inlet opening before the ring closes the exhaust ? Is the probIem during compression stroke - seems to be what's suggested - but I cant see any pressurised mix reaching the crankcase let alone the inlet. Or is the problem on the exhaust stroke where there might be a pressure pulse generated in the exhaust as the ring crosses the exhaust port ....could generate a pulse into crankcase and inlet port maybe?
    Be great to get a reply !

    • @cgriebel1
      @cgriebel1 2 роки тому +1

      I'm also interested as to why it screws up performance. It would have been great had he delved into the issue/problem that is created by this mis-match. Perhaps he'll see your post....

    • @cgriebel1
      @cgriebel1 2 роки тому +1

      Perhaps the lack of seal for that portion of rotation negatively affects the quality of the vacuum, and the volume of intake charge being dragged down into the crankcase?? Guessing here...

  • @codyabbott4791
    @codyabbott4791 3 місяці тому

    Is scavenging not a factor without an expansion chamber? Because with dirtbikes and snowmobiles they say having a slight overlap allows the exhaust gas exiting the cylinder pull a denser fuel/air charge into the crank case making more power.

  • @chadaccettura1993
    @chadaccettura1993 10 місяців тому

    Thanks a lot man, great video!

  • @BillsGarageWorks
    @BillsGarageWorks 2 роки тому

    Wow ya that makes perfect sense and I could see how that would be a easy miss!

  • @DIESELMAN8V92
    @DIESELMAN8V92 2 роки тому

    Thank you so much :) best tip I have ever learned!!!

  • @Kiltedwoodsmith
    @Kiltedwoodsmith 2 місяці тому

    Mr John can you port a ryobi saw and raise the CC's ?

  • @MrHuntermikey
    @MrHuntermikey 2 роки тому

    Awesome info big Thanks John

  • @DesertSawyer
    @DesertSawyer 10 місяців тому

    So can you add base gaskets to lower the upper exhaust port? I know compression would be less however, is the addition a benefit?

  • @ronsilva516
    @ronsilva516 2 роки тому

    I push a a laughing emoji by mistake keep doing what your doing👍👍👍👍👍👍😎

  • @thomaslindroos1667
    @thomaslindroos1667 2 роки тому

    This is gold thank you very much John

  • @ericnicol2616
    @ericnicol2616 2 роки тому +1

    Great video!! Thank you for that information!

    • @chadmeador1557
      @chadmeador1557 2 роки тому +1

      Hey Eric! Just subscribed to your channel as well! 🤘

  • @JRMny-nl4ut
    @JRMny-nl4ut 2 роки тому +1

    Thanks👍

  • @JohnWilliams-junglejohnny
    @JohnWilliams-junglejohnny Рік тому

    So my 362 I’m doing with meteor jug and piston . When intake cracks open . Bottom of bottom ring is just at roof of exhaust ,your thoughts on what u would do .squish is .024. And what timing numbers do you feel are good for this saw

  • @fearghalmorrissey2601
    @fearghalmorrissey2601 2 роки тому +1

    Nice tip 👍 makes sense 👍

  • @kylecromp319
    @kylecromp319 2 роки тому +2

    So how are you makin up the stroke difference? The 064 crank is wider than the 460.

  • @SixOFord
    @SixOFord 2 роки тому +1

    Good to know. Since your not doing used saws anymore I'll probably have to do my own 462. Expensive saw to learn on huh ? Oh well. Trial by fire lol.

    • @mateobrainardo4770
      @mateobrainardo4770 Рік тому

      Cutz the aluminum it does. It’s cutz the aluminum, nice and deep. Don’t raise the roof too much, or your torque will go on and fukt hisself.

  • @toddcaskey9984
    @toddcaskey9984 2 роки тому

    Great job