Makita 7301

[HORSELOGGER]

Was at the Home Depot yesterday, and looking at the blue bubble saws in the rental dept. Asked the guy if they could get the 7301, and after a call to HQ was told, yes, ...price 544.95 with a 20 inch b/c. Is there any diference in the Makita and Dolmar besides the color?

 

[rahtreelimbs]

No difference.........exact same saw. Real good saw too, same as the 7900 only 73cc instead of 78cc.


I really like the 7301..........as much as the the Husky 372. If you are the ( Unauthorized ) Official Arboristsite Odd Ball Saw King!!! like I am then working on your own saws is a given.

If not, then scroll to the top and give Bailey's a call and pick up a new 372 for less than the 7301!

 

[P_woozel]

can he still get a 7900 from Baileys for around 550.00?

 

[jokers]

can he still get a 7900 from Baileys for around 550.00?

If he can`t, he can get one from Hunter or EHP(both sponsors) for $595 + the cost of a bar and chain. The price on Dolmars recently went up. They were selling for $550.

I might add that as much as I like the 372, the 7900 is one fine and powerful saw, especially for around 600 bucks!

Russ

 

[Molecule]

7900 v 7300 re ... vibration

just a quick question to put my mind at ease before I make my final decision

from the parts lists for the 6400-7900 series, it appears that both saws have the same lower end. For each model, the crank and rod are the same identical part, or at least the part number is the same. Thus, the first geometric difference is the bore.

?-Since the counterweight in the crank is the same, I'm going to assume that the 47mm piston of the 6400 weighs exactly the same as the 10% larger (52mm) piston of the 7900-? But, a 10% increase in diameter is a 21% increase in volume (assuming piston lengths are the same and there is no change in sidewall thickness), and that seems like it would be significant volume of aluminum to "hide" or "lose" in a piston molding. If the 21% larger piston has a different weight, it seems one might better balance the crank than the other

since both have power to pull a 20-24" bar, and both powerheads weight the same on a shipping scale (14.3 empty, no bar&chain, which is, +/- a few ounces, exactly comparable with similarly nekked 440s and 372s) --

has anyone ever tested 7300 v 7900 to compare vibration ...

 

[woodsjunkie]

You might want to check with Dan Henry (dozerdan) is also a full servicing Dolmar dealer and also a sponser of this site and has very competitive pricing

 

[glens]

Molecule, don't be bringing weight discrepancies if you don't want to get a bad rep around here, hahaha!

Glen

 

[sedanman]

Molecule, Kinda off topic but not really, I am good friends with a machinist who builds Super Stock drag engines. He describes some of the more hairy engines he builds as being "over-balanced" where the crank is purposly balanced for a piston heavier than is actually connected to it, it gives the crank a little more authority over the reciprocating assembly, he swears it makes the engine a little more rev happy. He gets 930 hp out of a 402 inch ss/gt small block Chrysler so he must know what he's talking about.

 

[cbfarmall]

Paul and Molecule,

Your statement jives with what I've heard in the past. That when two engines were available with multiple cc's, the smaller disp. will actually rev a little better. I have noticed this on my 045's--one is 52mm 81cc, the other is 54mm 87cc. The little one is more zippy. To be fair, it has been awhile since I've pulled them both out.

Chris B.

 

[Molecule]

540 phase change

sedaman, that's really interesting ... I had been wondering whether my Makita 540 was somehow overcompressed, or over-cranked, or damaged flywheel, or timing adjustment, or what, since at low rpms it seemed to have this bangin' mean vibration -- I mean stick your finger in between the tank frame and the engine block and loose a fingernail for sure ... I'm just starting my second gallon of Amoco Ultimate 93 octane-usa w 40:1 mx2t

But then yesterday, I was cutting some 12-14" black gum and it was like whamm ... I am using a 16" 3/8x050 Z095 bar from a prior saw ... and when the bar got into about 10" of wood, the saw for the first time suddenly took off. Now, given a few inches of wood, it 4 cycles a little, which I call a happy sound. But sink it into about 10" of week old wood, and it suddenly "jumps" right up "on the cam". It's a totally new feeling -- the chain looses that chunky-feeling it has in 4-cycle mode (my chain is starting to grow some fingernails (hooks) from the 7/32 files). I mean that little puppy goes thru a phase change where it feels like it's suddenly "floating" in the wood -- not touching anything, but still spittin out the chips. The engine leaps into this screaming mode (and the sound pressure increases dangerously! -- I mean really dangerously-- it's much more sound pressure than when "winding out (the saw)" for lean point in a carb adjustment - but sounds like the same rpm). The cut rate increases and the vibration goes down. the chips come out clean and square. no dust.

I thought maybe I had leaned out the carb setting, but I checked that and its still about a 1/4 turn or what I call "fat" into the burble. I will say that the cut is faster in this float mode, but the torque is also less forgiving, since just a wee bit too much pressure on the bar and the chain stops and the clutch starts slipping

the only explanation that I can find somehow, what is out of balance at low rpms with no load, changes to in balance when a load and the rpms are right.

 

[Hunter]

The 7900 or the 7301 are both great saws. I personally like the 7900. Very strong and reliable. .
Hunter