Porting isn’t always the numbers game that people think it is! Nor is it about extremely high compression! Watch the level of performance gained in this saw!
Thanks for this video! Yesterday as I was finishing up the big bore kit on my 372, the bottom piston ring broke as I was installing it. I remembered that I once heard you say something about running "just one thin ring" on a two-groove piston, so I decided to just proceed and put it back together without a bottom ring. I want to give you credit for the prompt to keep me from quitting the job, and am happy to report that the saw runs really nicely. Today I sought out this video to confirm what the memory had told me, and now I've got the courage to keep running it without fear. Thank you!!!
I usually order the meteor 371xp single ring piston kit to save the work or the 268 so I can work it and work the squish band up and make a nice combustion chamber and squish… I started putting my Caber rings in the middle of the power zone between the squish and the top of the exhaust and adjusting the ring gap so that there’s a little more space between the closedown tips on the ring… cool tips dude! Keep on Truckin!!! 😂👍💪✊❤️🇺🇸
this is bringing up some memories.we just to do similar mods on ours old 50cc mopeds. sometimes we did it work realy good and get more speed.good old times
I can't help but laugh at people that cause drama over chainsaws or any other material thing. Unfortunately those are the kind of people we have to share this planet with. My favorite thing to do anymore is go as far into the woods and rivers to get as far away from "civilization" as I can. It's sad, and to be honest, I'm 41 and I'm not looking forward to the next 40 years. It sucks.
Im looking forward to this! I recently acquired an early road bounced 372 from a former grading company owner. I also ran across a 272K 50mm P/C set off of a concrete saw that looks pretty good and the smashed cylinder piston is loaded with the factory ridged side skirts intact! From my small block Chevy days! I wanted a blue_printed motor for a longer life.
Love what you're doing here. Thanks for the tips this is common sense. Not to say I don't like the other content, it's awesome. But this is cool in its own right. 😎
Ironhorse this was a great piece of work you made and I’m grateful for the knowledge that you just shared with me. I have learned a lot about rings that I didn’t know. I’m a mechanic with 25 years experience. I just learned a Lot here. Thank You.
@@DaveyBlue32 It was a crap shoot it seemed on the early 372’s whether they were single or double ring. But yes the 371 was/is a phenomenal saw. I prefer the 268xp piston myself
Great video. I love when folks complain about Harvey you can tell almost instantly they can’t reproduce what your doing so in there mind your spreading false information. What slackers. Keep up the great work my friend .!!! 🧬☀️🔥
I am really looking forward to this series! Do you sand or stone the inside edges of the sanded ring? I am guessing there will be a small burr left by the sanding. What is the pin you chose? Stock from something else or did you grind a taper on the inside ends? Thanks.
Id say your crazy but I know you are...one ring is better..waste to have 2...the pressure in the cylinder seals the ring during compression..the bottom ring dont get enough pressure to actually seal...rich from dynoport been saying that for years..👍👍
Each cylinder / saw is different so no ONE porting/build style is universally applicable! Laws of physics dictate More AIR = More TORQUE - always been this way and always will be - how ya get the increased air is up to you and your skill level … Too many guys tryin to “sell” ya these $500 port job/builds that sound like a angry hornet 🐝 these are tickin time bombs just waiting to blow 😂- IF ya know the nuts and bolts of how she works well ya know the ol saying … if ya can’t dazzle em with your brilliance then baffle em with bullshit, Fortunately I’ve been around the block and can call these turkeys out especially them ope forum boyZ - I luv boxing em in and then making em dance like a cat on a hot tin roof hee hee hee 😜
Awesome video Ironman!! I’m definitely glad to see some new things done on saws that people over look when trying to build a saw!!! I have a 2159 jonsered saw with a 20” bar and a 24” bar!! I would really like to figure out the best way to improve the Hp and torque on my saw!!! I would definitely like for it to be about a 70cc saw because of its weight!! I’m a shorter guy at 4’10” and have a bad back!! So a heavier saw is definitely out of the question!!! I really like the 2159 saw but I really think it needs a muffler mod and a few more cc!! What are your thoughts on that and what way would you go???
Hi there, iv just stumbled on your channel & video about 2stroke motorbike cylinders "transfer ports", you gave me a better insight to doing the T-P than most of the other vids I looked at,, anyways quick question the divider wall that runs down the T-P on mines has been knife edged & cut down from the top a bit to much for my liking can this be repaired ie aluminium welded back up to a standard level to the bottom of the cylinder?? If I could send you some pictures photos I would to let you see what's what,, the bike is a yamaha rd350lc,, a big thanks from me at Scotland Edinburgh 👍🏴👍
Have you thought of cutting windows in that piston? I’ve personally done that with a hyway piston worked great was a screamer until i had a c clip failure…….
Thanks for your generous sharing. What wrist pin did you replace the heavier one with? I watched 3 times and I could have sworn you said which pin it was ... maybe in another video.
@@theironhorse6600 Thank you so Much! I have put together, restoring to service 50+ saws but nothing in your realm. I appreciate the little gems that you say and take notes. I am looking for a lighter wrist pin for a Holzzforma 372xt ... hoping to "carefully" cut the weight of that piston and delete base gasket, and remove one ring and reduce the remaining ones tension.
I have a couple stihls and it makes me crazy the piston doesn't completely open up to the exhaust port, which has a stock floor. The ts350 concrete saw is really bad. Should I not let it bother me or take a little off the piston? both have plenty of compression.
It would have never occured to me to remove material from those rings to reduce tension. That is ingenious. Something I have recently learned about modern auto engines, especially Toyota, is that a guy had better be religious about changing his oil. Don't buy into that 10k mile crap. Do it every 5k or 6 months, whatever comes first. The fine grit that accumulates in your oil can cause your OIL rings to stick in the grooves of the piston, causing oil blow by and thus oil consumption (burning oil). This is all because modern auto manufatueres figured out how much you can gain by running low tension rings, and thats what they do. More power, better feul economy, less emissions etc. To your point... RING TENSION MATTERS.
