I hope this helps someone out and I am just passing on knowledge that was passed on to me... its how we ensure this knowledge doesn't die with us... thanks guys 💯
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.
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!
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!👍👍👍
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.
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!
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.
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.
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👍
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.
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.
Dude, you’re on RU-vid; Never be concerned to ask for a thumbs up a like or subscribe. That’s how you get paid. That’s the name of the game and you provide so much knowledge for the hobby. Obviously you do you, but ask for that thumbs up/subscribe! Just my two cents and thanks again for this killer info! Took a lot of mystery out of why we do and don’t and especially just reconfirmed why I’ll never buy aftermarket Chinesium. Cheers!
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...🤔
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.
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...
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.
But why? The crank case is closed already the transfers are closed so it is not affecting this i dont understand it can you explain it to me please? Thank you
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.
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.
I understand you said you were taught by and older professional builder, but that may have been the older days. Why would that be free porting. Why would the motor lose power because of that unless it was and old McCullough engine Maybe ? Technology has changed a lot sense then. Now If the bottom of the piston shirt was open at the exhaust port at tdc then that would be considered free porting and some of the intake charge would escape and you would probably loose power in the low rpm range. But having the intake still open when the compression ring just cracks the exhaust port, would probably hurt nothing. No charge is being lost just exhaust gases exiting the exhaust port.. I have ported kart engines for years and don't really see a problem with what you have there, unless the rest of the cylinder is junk. And I Hate cheap China aftermarket cylinders too. Most are total garbage. Keep up the good work it's a good way to show your customers sometime it's not worth using the cheaper stuff .
I wish there was more explanation too. I can't see what that ring getting past the exhaust port has to do with the intake. They're on two separate ends of the piston. Only thing I can think of is backpressure from the muffler getting past the piston skirt while the intake is still open on the downward stroke.
