I'm here to tell you, HARVEY IS SPOT ON HERE. I have done this conversion with a 266SE. I tried the cheap rout with an aftermarket intake block and gaskets. They leaked! Make sure your intake screws are sleeved with the insulators and do what Harvey said to get the heat out of the saw. I opened up my muffler which helped a lot. I was having some vapor lock issues. I believe I cured that by the muffler mod and running her just a tiny bit fat.
Great points on not raising the exhaust roof too high. You need the torque curve right behind peak horsepower. Otherwise, if the chain really bites in (gets hungry as Buckin' would say), the saw can't power through. Of course, all that goes out the window if you are running a properly tuned expansion chamber. But that is a horse of a different color. Love your videos Harvey. Thanks so much for doing them for us!
Hello sweetheart Enjoyed hearing from you glad you’re feeling better. Love your Merica hat 🇺🇸 . Hope that you and your family have a wonderful holiday and a safe one and a healthy one. God bless you all!!. PS we’re winning this fight for freedom!! . 🙏🏽❤️
Great video Mr Harvey! You're a fountain of knowledge, thank you very much for sharing your experience to help us build better saws! Keep up the awesome work 👍👍💪💪😁🇺🇸😎!
Great video Harvey. Picked up a nice 61 white top few months back. Updated fuel system and some tuning and it's running great. Now there is a new 52mm piston and cylinder sitting beside it waiting it's turn. Thanks for sharing
Good stuff iron horse you are a100% correct with using nitro another way to put it is the top fuel nitro drag cars the engines are almost hydro locking on fuel as they make that 1/4 mile run they burn around 20 gallons for warm up and one run it’s crazy to even imagine that much fuel being dumped into an engine that fast so 3 times the fuel in a saw and running a short time of 3 minutes and being out of fuel is spot on
Harvey, you really are the mad scientist of chainsaws! I loved the video, i bought a nice 61 awhile back, and maybe i'll do this one day, but for now i'd just be happy to get decent spark!
Just picked up old 266 with the 272 top end on it already, between you and the Tin man I feel like I'm ready to Port this sucker. Thank you I'd vote for you for President also😁
Your a good man for sharing your numbers and tips Harvey. Now do reed saws. Haha. I know, some things have to remain secret, but you have me intrigued about the p38 cc increase. Damit, now I'm going to have to rip my P38 apart and fiddle with it. Cheers
The newest Holzfforma 272 intake gaskets are back like the original oem. They have the small hole for the impulse. I recently did this conversion with a grey top 61. Used a highway big bore popup. First saw ive ever ported. Way more power. I used oem 272 screws and my 61's Carb(scared of the China carb). I couldn't find an oem intake or gaskets so tried farmertec. The newest batch of farmertec stuff is holding up now that they are making a complete 272xp. I had the same crummy luck that you had with Hogan's 266 and the older aftermarket gaskets blowing out except it was on my old 2100CD. Keep up the great videos.
Mine four strokes fine without a load and it cleans up in the cut. I can make it too rich with the bar buried. Seems to work fine with me. I have the Chinese 272 carb if it didn't work I but "don't kick a pulling mule"
My saw is an ass kickin monster/ I gotta let it really warm up good but it walks through Wisconsin Hardwood like it’s nothing This is the best build out there 👍
Thanks so much for sharing! I have an old 61 blue top, first firewood saw I bought. Still runs good, but doesn't get used much anymore because it is slow and heavy. Nice solid saw though. I always wondered about bumping it to a 272 - and what that would involve. I guess carb, intake, bolts, and piston/cyl with a little clean up. I think I'll keep it an old slow stock dog, for nostalgia purposes, unless it gets smoked in some big wood. Then, it will be reborn the way you show and say! Thanks again.
I rebuilt an old white top 61 with a farmertec piston, in a stock open port cylinder with some really minor porting on jug. I matched the case to the transfers and reduced intake skirt by .035" and also the bigger 268 style carb and minor muffler mod And it runs quite well .
@@vintagesawyer6246 Thanks! Food for thought! You should show how you do the piston jet holes. I didn't quite get that, though I understand the concept and reason. For some reason I like that old saw - maybe because it cut a lot of wood, and was my 1st "real" saw.
@@blanko8463 I have photos somewhere so I may make a short video. I really have no Idea if it helped or not so its probably not recommended. Drilling through a piston WILL weaken it structurally. In my case I was willing to risk it for research(lol). I would go with a slope side piston if you can get one. The part that faces the transfers is kinda angled so as to wedge the fuel up there as the piston goes down.That's the way the factory piston looked. But I got a Farmertec and wanted to put the saw together so I thought I'd try something.✌
@@vintagesawyer6246 Thanks! You got me thinking about taking that saw apart! I just ordered some burs for the Foredom. Maybe I'll try cleaning up a junk saw first!
Hell just running high octane gas makes a difference. More octane slower burn so we need either more room to burn or bigger bang. Bigger bang equals more compression. Put oxygen in your gas if you want faster burn, and run less compression. I have a Lyman with the 6 hole turn table to run 3 sets on dyes. Also have a single 1 dye at a time rock chucker. The old anschutz savage 64 in 222. Rem is picky with ammo. It has a slower twist in the barrel 40 to 45 gn lead only, except I dont use lead solid copper.
I've come pretty far with my porting. I build some of the best ported saws in my area. Have built quite a local reputation. Anytime I wanna learn something... iron horse is the man to learn from. I like mastermind.. but he just doesnt grasp a full understanding of 2 stroke theory. Iron horse does tho ;)
That a Redding there or rcbs, nob looks Redding, love my Redding t7 turret press, sorry when I see that stuff I quickly sidetrack lol, always gain something from u uncle harve
Thers no one I'd rather talk to about putting those things together too than uncle harvey just because I know of his meticulous and common sense brain I'd love gun channel too but that's too much work, we cant havem all but seriously on here we just a well forget pews pews on here the real 1st ammendment is gone...that's why u cantvtalk about the second ammendment, it's for when the first doesn't work and theyere shaking in their little fine mahogany office chairs because they KNOW power is to US the people....sry guys j get wound up
For your information, I have two grey top 61 saws that fit over a 272 top end without any cutting. The grey tops that came with the bigger filter are perfect for these big bore kits
Thanks so much for being willing to help out guys like me who want to get into building saws! Question does it help to fill some of the case by the transfer and shape it to flow into the transfer port? I thought it might help with a more direct air flow. Thanks again, Iain
Hi Harvey like your videos so clever years of experience very clever and your stories ar great i have a 61 im going to turn to 272 i hope cant you make templates of good ported saws and sell them is that possible just a thought any how well done think your great.
Hi Harvey. Thanks so much for your videos. I am currently building a 61 to 272 myself. You might be interested in the carburetor work I’ve been doing on it. I’m modifying the stock 61 carb for more flow. I bored it out and installed a larger throttle butterfly and slightly bored out the Venturi. Spent a ton of time making sure to keep the steps in the factory spots. Just got it back together and ready for testing. The throttle side opening is now 20.5 mm compared to the stock 19 mm (3/4). I have one question for you. You mentioned 160 degrees max for the intake port. Do you have a minimum number? I’m looking for as much low end grunt as I can get out of this 272 top end. Any suggestions would be greatly appreciated.
I ran a 250 BSA on methanol, and got the jet kit for the carb from Amal Co. Ltd. The main jet went up from 160 to 450, and they provided all the other jets as well. The fuel absolutely ruined the nice paintwork on my tank however, but we were allowed to use any fuel, so the bike got past scruiteneering Ok. . . .
I also love hyway, however, some cylinders have poorly adhered chrome. So be weary if ur planning on porting. In stock applications, it's not an issue. Because the chrome is adhered up into the ports and thins out. So it holds together well. If u port, ur risking chipping at the exhaust. Iron horse, have you ran into this problem with highway yet? It only seems to be the problem with some models tho. Not all the cylinders are easy to peel.
I havent had a 272 flake yet. I guess it just depends on the model or batch. I've had some awesome cylinders come from hyway. Most aftermarket cylinders dont have the same as oem timing... but hyway cylinders always seem to have the right timing numbers. That's another reason I really like hyway
Clarification? You said, which I believe to be true, that nitro delivers more oxidizer to the fuel combustion process. Then you said the carb will need to have a bigger air intake. Could you explain why?
So Harv I'm looking at those cheap 272 carbs to do up my 61 with a hyway kit and they sell the same carb for the 61 is the 272 carb jetted different ? Just wondering exactly why I can't use the 61 carb?
I have a 49cc scooter. I've just put a new piston and rings in it it runs so much better but I wish I ported and polished it. It only takes 2 minutes and I've got the piston out. it's so much fun to work with. My friend has also bought a scooter and both engines are equally the same. We both race and there's no difference please help me beat him
HEY HARVEY, FIGURING I'D SCREW THE FIRST ONE-UP ANYWAY, I BOUGHT A CHEAP CHINESE PISTON/CYLINDER KIT FOR LIKE $26.95, THINKING I COULD REPLACE THE FLAT TOP PISTON WITH A POP-UP HI-COMPRESSION ONE, KNOWING THE ENTIRE BUILD IS DESIGNED FOR IT. BUT, TRY AS I MIGHT, I HAVE NOT FOUND JUST A HUSKY 52MM POP-UP PISTON AND PIN SET-AT ALL. I KNOW YOU RECOMMEND THE HIWAY KIT., BUT AT NEARLY $100 CHEAPER, I JUST A-S-S-U-M-E-D ONE COULD BUY A 272 HI-COMP JUG WITH A PIN. THE HYWAY KIT IS THE ONLY ONE I HAVE SEEN-AT ALL...KNOW WHERE TO BUY JUST THE POP-UP PISTON?
I'm here to tell you, HARVEY IS SPOT ON HERE. I have done this conversion with a 266SE. I tried the cheap rout with an aftermarket intake block and gaskets. They leaked! Make sure your intake screws are sleeved with the insulators and do what Harvey said to get the heat out of the saw. I opened up my muffler which helped a lot. I was having some vapor lock issues. I believe I cured that by the muffler mod and running her just a tiny bit fat.
Great points on not raising the exhaust roof too high. You need the torque curve right behind peak horsepower. Otherwise, if the chain really bites in (gets hungry as Buckin' would say), the saw can't power through. Of course, all that goes out the window if you are running a properly tuned expansion chamber. But that is a horse of a different color. Love your videos Harvey. Thanks so much for doing them for us!
Yer welcome tony!
I have a white top 61, really enjoy this! Didn't know Hornady made saw parts! Have lots of those too!
Amazing detailed information mr Harv. Thank you
Bless you for sharing your wisdom with us!!! I love all the details and hints on what to do and what not to do!!!
Hello sweetheart Enjoyed hearing from you glad you’re feeling better. Love your Merica hat 🇺🇸 . Hope that you and your family have a wonderful holiday and a safe one and a healthy one. God bless you all!!. PS we’re winning this fight for freedom!! . 🙏🏽❤️
Great video Mr Harvey! You're a fountain of knowledge, thank you very much for sharing your experience to help us build better saws! Keep up the awesome work 👍👍💪💪😁🇺🇸😎!
A fantastic vid to learn from Harvey. Thank you.
Great video Harvey. Picked up a nice 61 white top few months back. Updated fuel system and some tuning and it's running great. Now there is a new 52mm piston and cylinder sitting beside it waiting it's turn. Thanks for sharing
Good stuff iron horse you are a100% correct with using nitro another way to put it is the top fuel nitro drag cars the engines are almost hydro locking on fuel as they make that 1/4 mile run they burn around 20 gallons for warm up and one run it’s crazy to even imagine that much fuel being dumped into an engine that fast so 3 times the fuel in a saw and running a short time of 3 minutes and being out of fuel is spot on
I just did a 61 to a 272xp build. Loved how it turned out. Even did a 365xp/372xp full wrap conversion on the 61/272xp. Worked fine.
372 full wrap handle on 272?? How much did u have to change it?
@@MrPittman95 go watch the video!
very good explaining harvey.big thumps up
Hey Harvey Collin you are the PROFESSOR RIGHT ON BROTHER...🙏☮️❤️🇺🇸
Hey skippy!
Love the stories and videos. Merry Christmas to your family Iron Horse
Harvey, you really are the mad scientist of chainsaws! I loved the video, i bought a nice 61 awhile back, and maybe i'll do this one day, but for now i'd just be happy to get decent spark!
Great information Harvey.
Just picked up old 266 with the 272 top end on it already, between you and the Tin man I feel like I'm ready to Port this sucker. Thank you
I'd vote for you for President also😁
Very informative!! Great job!!
Can‘t wait for the Gas vs Nitro Video.
Thanks for your Knowledge.
Stay healthy,
That's a real teachers mentality right there a video JUST FOR YOU, no crap straight to the hard part...harvey ur AWESOME brother
Your a good man for sharing your numbers and tips Harvey. Now do reed saws. Haha. I know, some things have to remain secret, but you have me intrigued about the p38 cc increase. Damit, now I'm going to have to rip my P38 apart and fiddle with it. Cheers
Great information! Thank you!
Thank you! I just tore my 288 down and am going to try my first port job.
Harvey good to see school is back awesome stuff
The newest Holzfforma 272 intake gaskets are back like the original oem. They have the small hole for the impulse. I recently did this conversion with a grey top 61. Used a highway big bore popup. First saw ive ever ported. Way more power. I used oem 272 screws and my 61's Carb(scared of the China carb). I couldn't find an oem intake or gaskets so tried farmertec. The newest batch of farmertec stuff is holding up now that they are making a complete 272xp. I had the same crummy luck that you had with Hogan's 266 and the older aftermarket gaskets blowing out except it was on my old 2100CD. Keep up the great videos.
Thanks Ben!
I'm about to embark on the same journey with a 266 (first saw i'm porting). Do you think the carb from the 61 is delivering enough fuel?
Mine four strokes fine without a load and it cleans up in the cut. I can make it too rich with the bar buried. Seems to work fine with me. I have the Chinese 272 carb if it didn't work I but "don't kick a pulling mule"
Thanks Ben, I'll move forward without worrying about the carb for now.
My saw is an ass kickin monster/ I gotta let it really warm up good but it walks through Wisconsin Hardwood like it’s nothing This is the best build out there 👍
Thanks for sharing your knowledge
Sincerely Johannes
Thanks for sharing! Cheers from Buffalo!
Great vid uncle Harv!
Thanks so much for sharing! I have an old 61 blue top, first firewood saw I bought. Still runs good, but doesn't get used much anymore because it is slow and heavy. Nice solid saw though. I always wondered about bumping it to a 272 - and what that would involve. I guess carb, intake, bolts, and piston/cyl with a little clean up. I think I'll keep it an old slow stock dog, for nostalgia purposes, unless it gets smoked in some big wood. Then, it will be reborn the way you show and say! Thanks again.
I rebuilt an old white top 61 with a farmertec piston, in a stock open port cylinder with some really minor porting on jug. I matched the case to the transfers and reduced intake skirt by .035" and also the bigger 268 style carb and minor muffler mod And it runs quite well .
Try a base delete and fresh piston on that 61 . They run all right. Good torquey saws.
@@vintagesawyer6246 Thanks! Food for thought! You should show how you do the piston jet holes. I didn't quite get that, though I understand the concept and reason. For some reason I like that old saw - maybe because it cut a lot of wood, and was my 1st "real" saw.
@@blanko8463 I have photos somewhere so I may make a short video. I really have no Idea if it helped or not so its probably not recommended. Drilling through a piston WILL weaken it structurally. In my case I was willing to risk it for research(lol). I would go with a slope side piston if you can get one. The part that faces the transfers is kinda angled so as to wedge the fuel up there as the piston goes down.That's the way the factory piston looked. But I got a Farmertec and wanted to put the saw together so I thought I'd try something.✌
@@vintagesawyer6246 Thanks! You got me thinking about taking that saw apart! I just ordered some burs for the Foredom. Maybe I'll try cleaning up a junk saw first!
Good info as always 👍👍👍👍🍺
Hell just running high octane gas makes a difference. More octane slower burn so we need either more room to burn or bigger bang. Bigger bang equals more compression. Put oxygen in your gas if you want faster burn, and run less compression. I have a Lyman with the 6 hole turn table to run 3 sets on dyes. Also have a single 1 dye at a time rock chucker. The old anschutz savage 64 in 222. Rem is picky with ammo. It has a slower twist in the barrel 40 to 45 gn lead only, except I dont use lead solid copper.
I've come pretty far with my porting. I build some of the best ported saws in my area. Have built quite a local reputation.
Anytime I wanna learn something... iron horse is the man to learn from. I like mastermind.. but he just doesnt grasp a full understanding of 2 stroke theory. Iron horse does tho ;)
That a Redding there or rcbs, nob looks Redding, love my Redding t7 turret press, sorry when I see that stuff I quickly sidetrack lol, always gain something from u uncle harve
Haha! It’s a single stage rockchucker!
If you get a break between saws, share some of your favorite coyote, fox, and Whitetail rifes/revolvers!
Thers no one I'd rather talk to about putting those things together too than uncle harvey just because I know of his meticulous and common sense brain I'd love gun channel too but that's too much work, we cant havem all but seriously on here we just a well forget pews pews on here the real 1st ammendment is gone...that's why u cantvtalk about the second ammendment, it's for when the first doesn't work and theyere shaking in their little fine mahogany office chairs because they KNOW power is to US the people....sry guys j get wound up
For your information, I have two grey top 61 saws that fit over a 272 top end without any cutting. The grey tops that came with the bigger filter are perfect for these big bore kits
Thanks so much for being willing to help out guys like me who want to get into building saws! Question does it help to fill some of the case by the transfer and shape it to flow into the transfer port? I thought it might help with a more direct air flow. Thanks again, Iain
Good. Thanks
thanks 4 video. be kind.
Nice video ironhorse
I second what Robert says! FYI Harvey when ya get to my 372 and you finish it I want to drive out and shake yer ✋ please!!😎👍
I would simply love that! Thanks !
@@theironhorse6600 MY PLEASURE! See ya when it happens Harvey im laid off till April so lol before then would be fantastic 👏
Hey Harvey. The way you did the intake on that cylinder. Does that work well with smaller cc saws like 50cc ?
I like the 046 and 044 like you do, I would love to see you work on a O44 head as payment I will send you one of my custom mufflers!
My favourite thing other than my family are dirt bikes chainsaw and shooting / hand loading
harv, you help me pass the day
Hi Harvey like your videos so clever years of experience very clever and your stories ar great i have a 61 im going to turn to 272 i hope cant you make templates of good ported saws and sell them is that possible just a thought any how well done think your great.
Thank s
Love all the reloading stuff in the background.... cept the inertia puller, i doont love those. Anyway, think this can be done with a jonsered 630?
Very interesting
Like these videos how much would u need to build my 394 xp up
U can get the bolts on Ebay in a 272 carburetor block kit I think from dukes
Have you thought about getting a dynamometer for your channel? It would be cool to see before and after numbers.
I would love to buy one of your big saws
harvy i know that you will bee building a great saw fro me
Harvey nothing like building saws on the boomstick bench lol guess that's where the the scales are and the powder is to make explosive fast saws 🤣🤣🤣
Will a 262 be happy with the same durations as you recomend for the 272 ?
Very nice video btw. 👍🏼
Sure will!
Hi Harvey, I went looking for a 272 carb for my 61 conversion but they seem to be the same carb from 61 to 272? Any suggestions?
Hi Harvey. Thanks so much for your videos. I am currently building a 61 to 272 myself. You might be interested in the carburetor work I’ve been doing on it. I’m modifying the stock 61 carb for more flow. I bored it out and installed a larger throttle butterfly and slightly bored out the Venturi. Spent a ton of time making sure to keep the steps in the factory spots. Just got it back together and ready for testing. The throttle side opening is now 20.5 mm compared to the stock 19 mm (3/4). I have one question for you. You mentioned 160 degrees max for the intake port. Do you have a minimum number? I’m looking for as much low end grunt as I can get out of this 272 top end. Any suggestions would be greatly appreciated.
150 degrees minimum!
Thank you for replying you made my day! Take care from Alberta Canada
Do you know if there is a difference between the white ,black and orange top model 61 Husqvarna saws thank you
I ran a 250 BSA on methanol, and got the jet kit for the carb from Amal Co. Ltd. The main jet went up from 160 to 450, and they provided all the other jets as well. The fuel absolutely ruined the nice paintwork on my tank however, but we were allowed to use any fuel, so the bike got past scruiteneering Ok. . . .
My 61 already has a hole broken in the top. I think I blew a crank seal a month or so ago. I got a new 455 rancher now.
I also love hyway, however, some cylinders have poorly adhered chrome. So be weary if ur planning on porting.
In stock applications, it's not an issue. Because the chrome is adhered up into the ports and thins out. So it holds together well. If u port, ur risking chipping at the exhaust.
Iron horse, have you ran into this problem with highway yet?
It only seems to be the problem with some models tho. Not all the cylinders are easy to peel.
Had a 272 husky cylinder flake last year! Only one to date!
I havent had a 272 flake yet. I guess it just depends on the model or batch. I've had some awesome cylinders come from hyway. Most aftermarket cylinders dont have the same as oem timing... but hyway cylinders always seem to have the right timing numbers. That's another reason I really like hyway
Clarification? You said, which I believe to be true, that nitro delivers more oxidizer to the fuel combustion process. Then you said the carb will need to have a bigger air intake. Could you explain why?
So Harv I'm looking at those cheap 272 carbs to do up my 61 with a hyway kit and they sell the same carb for the 61 is the 272 carb jetted different ? Just wondering exactly why I can't use the 61 carb?
You can use your oem carb!
@@theironhorse6600 awesome thanks for the reply. Love your channel and everything you share your a hell of a guy
I have a jonsered cs2171 turbo. What are some good numbers?
I found a 268K in a dumpster, now I'm seriously tempted to put a 272 cylinder on it, and port it.
How do I transfer the measurement of the piston windows around transfers
Chainsaws and reloading- know very few people that are really into saws that don’t reload. Odd......
Back in session with Harvey university school of chainsaw 👍
HELL-YES, HARVEY! I'M PICKING-UP LITTLE SAWS NOW. ALWAYS WANTED TO "MASTER THE SAW". I'M THINKING...HYDROGEN!
Hej. Harv. !
Does The 266 and 390 have The same piston stroke?
390 is longer
Harvey your a handloader too
Sure am!
I have a 49cc scooter. I've just put a new piston and rings in it it runs so much better but I wish I ported and polished it. It only takes 2 minutes and I've got the piston out. it's so much fun to work with. My friend has also bought a scooter and both engines are equally the same. We both race and there's no difference please help me beat him
Been working on a 266 husky base gasket and muffler mod but has irratite idle believe it is air leak but wondered what u thought
Very likely!
@@theironhorse6600 thank you
Hey buddy. I'm on a job with bunch of locusts. If you need any fence posts let me know..no charge for you..I'm making a bunch up.
Thanks Tim! Be happy to have some!
How about a reloading lesson?
HEY HARVEY,
FIGURING I'D SCREW THE FIRST ONE-UP ANYWAY, I BOUGHT A CHEAP CHINESE PISTON/CYLINDER KIT FOR LIKE $26.95, THINKING I COULD REPLACE THE FLAT TOP PISTON WITH A POP-UP HI-COMPRESSION ONE, KNOWING THE ENTIRE BUILD IS DESIGNED FOR IT. BUT, TRY AS I MIGHT, I HAVE NOT FOUND JUST A HUSKY 52MM POP-UP PISTON AND PIN SET-AT ALL. I KNOW YOU RECOMMEND THE HIWAY KIT., BUT AT NEARLY $100 CHEAPER, I JUST A-S-S-U-M-E-D ONE COULD BUY A 272 HI-COMP JUG WITH A PIN. THE HYWAY KIT IS THE ONLY ONE I HAVE SEEN-AT ALL...KNOW WHERE TO BUY JUST THE POP-UP PISTON?
just wack a big cam and a 850 DP on there she be good lol
Haha! Let’s try it! How ya doin bill!
harvey, most rc fuels are 15-18% oil is that to much oil????
It’s castor based generally and with that much heat and pressure it’s needed! After all rc cars are two stroke!
@@theironhorse6600 lots of smoke and great smell! take care you guys.
Nice reload bench iron horse 🐎
Lol 😆