Dolmar 64xx/73xx/79xx series, smurfs and solo 665/675/681 thread

[Rob Stafari]

Had my baby out for the first time in a long time the other day. Unfortunately the tree was mostly brush, so the 200T did the majority of the work aloft. The smurf got its turn when it came time to fell what little spar there was and buck it. Had forgotten that I got a little too file happy with the rakers on that chain. So I had to be light handed, but twas maple and not a problem...

 

[stranter]

Check out the "7900 Coil Swap" for more info. I did it a few years back and thought I had made a step by step guide on how to do it ( or how I do it).

Great. Thanks, very helpful. I will have another go when I get a chance.

 

[mettee]

Lots of good info at the beginning of this thread. This is on page 3 at the bottom

 

[huskyboy]

This bone stock makita 7301 rated at “5.4” hp from the factory was only about a mere second behind this good running 572xp with a muffler mod, which is rated at “5.9” hp from the factory. Same bar same chain.

Now just for a reference, this particular 572xp was about even steven with a “snellerized” ported 441 in a previous comparison. The 441 is a 5.6hp saw in stock form.

 

[huskyboy]

So to conclude the long winded post above... I believe that the hp rating of the 7301 is totally underrated lol. More like roughly 6 horsepower instead of 5.4 horsepower. It was pretty much hanging with saws that are rated at more hp stock... that were modified and making more than stock hp. Goes to show that the paper specs aren’t something to take seriously, the real world performance is what matters.

 

[Wilhelm]

The Dolmar/Makita 7300/7310 is a factory hot rod/sleeper!

Either nobody wants to admit it out loud, or nobody knows.

My Dolmar PS-7310 will pull my 36" B&C setup just as well as my Dolmar PS-7900 - both with just a mild muffler mod.

 

[andyshine77]

The 7300 is definitely a sleeper saw. To be honest so is the 6400, the 6400 is right there with a 372, maybe more torque do to the long stroke for its cc.

 

[huskyboy]

Imho the only thing a 7900/7910 has over a 7300/7310 is a bit more grunt/torque. They both cut about the same speed to me lol. The 73 does use a little bit less fuel than a 79 as well from what I can tell.

 

[huskyboy]

They have it pretty well figured out lol... 64 for a 20”, 73 for a 24” and a 79 for a 28” bar. At least that’s what I would usually choose to run in hardwood on em in stock form.

 

[Wilhelm]

Imho the only thing a 7900/7910 has over a 7300/7310 is a bit more grunt/torque. They both cut about the same speed to me lol. The 73 does use a little bit less fuel than a 79 as well from what I can tell.

You ever tried running a full tank of fuel on a 6400, 7300/7310 and a 7900 in a row in a log pile?

The difference in fuel consumption is significant with the 6400 being the most economic (~30 minutes), the 7900 being the least economic (~15 minutes) and the 7310 being on average in between (~20 minutes) - this is my experience standing at a log pile doing one bucking cut after the other while a second person keeps the pile clear of bucked rounds.

For comparison, my Dolmar PS-550 will run an average of 45 minutes on one tank of fuel, tested on hyper clean beech logs spending 7 tanks of fuel without needing to sharpen the chain.
Yes, I actually took notes to test it in detail!
That was truly a fun day, I had never bucked logs that clean before.

My PS-6400 & PS-550 are stock, my PS-7310 & PS-7900 have a mild muffler mod.

 

[Wilhelm]

They have it pretty well figured out lol... 64 for a 20”, 73 for a 24” and a 79 for a 28” bar. At least that’s what I would usually choose to run in hardwood on em in stock form.

PS-550 = 18" 3/8" main
EA5000 = 20" 3/8" main
PS-6100 = 20" 3/8" main
PS-6400 = 20" 3/8" main
PS-7300 = 18" 3/8" main (came with it, will switch to 20" eventually)
PS-7310 = 20" 3/8" main , 36" 3/8" secondary, 20" .404" thirdly
PS-7900 = 20" 3/8" main , 36" 3/8" secondary, 20" .404" thirdly

Why complicate things?!

I have a brand new 24" 3/8" B&C setup, I have yet to bring myself to use it.

 

[huskyboy]

You ever tried running a full tank of fuel on a 6400, 7300/7310 and a 7900 in a row in a log pile?

I’ve ran them all for a day logging on different days. The 6400 and 7900 I “ported” a bit . Both the 64 and 73 are better on fuel. Once I get into real big stuff (28”+), the 7900 is more efficient for the amount of gas used. This is because it cuts more effectively in big wood with a bit more torque, might be using more fuel... but it’s getting more wood cut per tank in big stuff as long as I put in the effort to work productively. Smaller hardwood (about 24” and under) the other two are more effective. The 572 is similar to the 7301 for both fuel efficiency and power. Right now I’m on a ash job with most of the wood small to medium size and the 64 and 73 are what I am using with 24” bar. They also have enough reserve for the occasional bigger tree.

 

[huskyboy]

Efficiency isn’t just to do with fuel mileage, the amount of wood cut per tank is something to consider as well. Ergonomics can help you be more efficient too, but that’s a whole nother story lol. A 90cc saw will usually get more done on a tank with a 36” bar than a 70cc saw. 70cc saw will usually get more done on a tank with a 24” bar than the 90cc saw will. Use the tool for the job. Of course now everyone has there own idea of that.. experiment and use what works for you.

 

[Mastermind]

This bone stock makita 7301 rated at “5.4” hp from the factory was only about a mere second behind this good running 572xp with a muffler mod, which is rated at “5.9” hp from the factory. Same bar same chain.

Now just for a reference, this particular 572xp was about even steven with a “snellerized” ported 441 in a previous comparison. The 441 is a 5.6hp saw in stock form.

Yer getting saw chips in yer shoes.

 

[Wilhelm]

Yer getting saw chips in yer shoes.

Saw chips in ones shoes and socks are good against smelly feet.

 

[huskyboy]

I sure had to use the air compressor on my shoes and socks that day! Lol

 

[tickbitintn]

Saw chips in ones shoes and socks are good against smelly feet.

Especially when it's cedar! Lol

Sent from my XT1635-01 using Tapatalk

 

[mettee]

I always wish I had stopped to put pants on...

 

[Black Dog Chainsaw]

I always wish I had stopped to put pants on...

You all need to get taller socks! [emoji16]

 

[mettee]

No matter what socks it still goes in the shoes with shorts.