Loving the dolmar’s man. Keep ‘em comin!!

Heck yea.... love these videos... your tone is emotionless, it adds horsepower to your Chanel 👍🏽🔥🔥

Hey Joe I appreciate the way you start your tear downs with a spotless clear work bench ! Then you set parts in different locations according to reassembly. Love it. Wish I was more organized!!

Those look like great saws to port....seems like the only EPA controls are the cat muffler. Plus single ring piston. Good video Joe

Awesome gains Joe! It’s just phenomenal!! With that kinda of power you could probably file the rakers/depth gauges down and it would be squirting out woolly worms for chips! That’s over double the hp my 460 rancher is advertised at. And no additional weight!!

a perfect video. not to long and detailed enough. wached every second of it. very interesting build!

That's some impressive gains 👍

I love it a sleeper saw. One you pull up to a wood pile on a sat. Morning with some buddies and throw chips like it’s nobody business 😎👍

Dude you know what I think. These videos are the bomb!!!

Awesome video. The Dolmars/ Makitas are one of the most underrated saws. Keep going! Looking forward for more videos! Cheers from Germany!

Was considering the 7900 as a new saw to get.. as if I don't have enough already. Definitely sending it your way if I get one

Excellent video. Thank you for the great video

Wow, great gains, the other thing to note is that this is a new topend, I expect the ported topend will gain a bit more as the ring seats in.

Excellent work Joe!! I want you to do my saws!!

Excellent build sir hope u are well.

Nice job as always,

Great video as always!

The charts are a good visual but I think even a half deaf person could hear those gains. Very impressive both the saw and your skills sir.

Awesome video man!!!!

That’s a nice saw. I wish we had them here

Great video! That one really woke up!

What power! Monster saw right there!

Damn nice job you do!!

I got the Dolmar red version of that saw I kinda want to find a Makita blue one to play with too

Amazing gains!

Great video bud 👍

Good stuff!

Makita they startin' to look like a Faberge egg with a chainsaw bar .. kind of reminds me of an old AMC pacers shape .. even the color is about the same as they head back in the day.. let's see how many horsie it can push ?! 😁👍

I’d like to see the owner of this saws face when he puts it in the wood , imagine the difference lol .

I would love if you would dyno a oem piston cylinder combo vs a aftermarket to see the difference

Great video and work! 🤝🤝🤝

My saw can’t wait to give her a rip video will be coming on my channel

Sounds good 👍

big gains!

Good job!

You should try out the factory HD filter kit and show us if it actually makes more power than the standard one. I've got a bone stock 6421 with cat still in the muffler to test as well if you need one.

You built a monster!👍👍👍👍🇺🇸🇺🇸🇺🇸🇺🇸🙏🙏🙏🙏

I've got one of those with an ironhorse style exhaust and it just rips!

Thats perfect build brother. I run saws every day all day. I run my saws at higher rpm. Keep the chain tuned to my saws power i mean. That thing has perfect power band!!! Out of all the saw you have dynoed.

I've had a 6400 and didn't know you could swap the cylinders!

Just picked up a 6421 with a bad top end. Gonna do the 7900 P&C and muffler mod. Eventually gonna port it but gonna run it with the stock 7900 top end for now.

Hey Joe. Can you please explain exactly what it going on when you are turning the knob and what is hooked up to the saw to make the RPMs drop like they do. I’m confused how it’s all working ?

I’d like to see you make a quick video of how you modded that muffler. Please keep the Dolmar stuff coming.

Thank you!!

Bonjour, vous avez fait une deuxième sortie à l'échappement, avez-vous enlevé la chicane à l'intérieur ?. Merci.

Wow, what a screamer!

Joe few things… 1) where did the low and high speed carb screws end up compared to stock? 2) do any builders run thermal couples on these hopped up saws? Be it either in exhaust or spark plug? If so what temp differences do you see? 3) what kind of warranty if any do you provide with this type of work? Any use restrictions? Premix recommendations?

AWESOME VIDEO!!! Do you think the carb is big enough and estimated gain from a bigger carb? Man I want to see that thing with a pipe on it. Beings my go to saw is a 7301 I really enjoyed this video. Only issue I've seen is the pulse hose will pull of if you get it hung and jerk on it. That was its only issue when I got it for $150 from original owner who thought it was blown up. As always another perfect video! DYNO JOE FOR PRESIDENT!!

hi i have a 6401 Makita that it have a limited cap on the H screw the L doesn't have any limited cap what adjustment do i need

Could you dyno a cylinder with long blow down tranferports and then show short blow down on the same cylinder. I'd like to see what power/ torque difference might be.

Classwork!!! after such an upgrade, what will be the safety margin of the chainsaw?

How much would it cost to perform this mod on a stock 6421? Parts and labor?

How do you zero using a digital angle finder? I’ve been using a hollow threaded plug in the spark plug hole and a dial indicator.

That’s going to be a pulling machine!!!

Thats a great improvement. Have you done the husky coil conversion to eliminate the limiter? I have that same build I just can't seem to get back to and the husky coil floating around somewhere also.

hi joe wondering if you could explain why you always cut the squish band before checking it? you said " i didnt check the squish because i plan on doing machining anyways"

Hi Joe, Just bought a Makita EA7900. Plan on doing a muffler mod in the near future. Doesn't seem like a straight screwdriver adjusts High and Low jet. Do the new Makita 7900's have screw that requires a special tool?

Nice build, did you notice any vibration caused by the larger piston, ?

Nice, would like to try it on one of my Solo 675/681s as well, but I'm a little afraid of messing it up. How much difference between cat and ripped cat btw? Guess if the cat blocks the exhaust, porting won't help much ;-)

I got a 6401 from the local pawn shop for $200 and have been pleasantly surprised. Want to increase the exhaust flow, does the muffler just split apart?

Joe If the piston is slightly domed do you try to cut the squish parallel to the dome on the piston??

Exhaust at 98 durations seems so low to but is that to basically keep it power at a lower or high rpm for torques. Jw thanks

That owner is going to kiss you on the lips!!! That is bad a$$. It’s like a different saw all together!!

How long bearing last?

Does the 64xx weigh the same as the 79xx series? If so, wouldnt you be money ahead to buy the 79xx?

I would like to see what the HD filter does to one of these good or bad.

WOW!

Looks like a great result! How poorly do the Chinese big bore (85cc?) kits compare? I'm guessing the HP curve comes out a lot flatter?

question why didn't you cut the base deeper and use a base gasket instead of deleting it just wondeing

I would like for you to upgrade my Makita. How can I get in touch with you?

Hi. Question from Argentina. I own the same saw machine but 7300 model and would like to up grade to the 7900 cylinder kit. Do I need to change something else.../buy something else or just order a new cylinder kit and change it. Thanks in advance

Do you have any shops you can recommend on the West coast of Canada? 7900P

1 year later hows the makita saw running? Lightwork or work it hard?

Do you need to put a different carburetor on it for bigger bore?

It looks like the Intakeport is wider than the Pistonskirt? Does that work? Awesome Job , impressive Power

Would a 52mm piston from a Stihl or Husqvarna work?

can you supply a ported piston barrel kit for my 6400 taking it up to 7900 spec?

Hi I have a ms311 I would like ported do you have time and what is the cost

I don't know why but every time i see one of these or hear it idling, i think of Harley-Davidson...

Get a cheap chain saw and do a nitro fuel test with Rc fuel would be a cheap and easy vid to make

What style orodel 79cc OEM cyl is best or do a after market bore n port get it nicsil coated reliable badass saw ??what u think Joe

Joe was that an aftermarket or oem piston ??

Co may husqvarna 288xp ko vay chu oi.

The manual states 4,7 hp @ 9000 rpm for 6421 6,2 hp @ 9500 rpm for 7900/7901 I know these can't be compared to ur dyno, but helps explain how peak was moved up so much

【from Hipa】Do you like to test accessories for your equipment?thanks

Is that a oem cylinder

What did the squish end at?

Hi Joe. It's me. Again a Question from Argentina. I have this saw with this setup (79 cc muff mod) and according to your data at 8-9000 rpm reached 5.5 HP. In your previous ECHO 620 video, a 60 cc chainsaw with muffler mod reached 5.5 HP as well. Ported they reached above 8 and 6 respectively. How do you explain that? that a smaller saw with muff mod gave more HP ......but ported the biggest cc gave more (which makes logic, isn't it?). Thanks in advance. Cheers

wouldnt 4 to 8 be almost a 100%

They told me that makita stop the gas machines such chainsaws. Is this true ? And that in the close future someone who have a makita gas machine will not find any parts of this company.

Isn't that nearly 200% not 50 %?

Too cheap to smoke.......familiar?