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

huskihl · Apr 14, 2019

Adirondackstihl said:
7900 is windowed
7910 is slab sided

And the exhaust port on a 7910 can be made a whole helluva lot bigger...

...if yer into that

Adirondackstihl · Apr 14, 2019

huskihl said:
And the exhaust port on a 7910 can be made a whole helluva lot bigger...

...if yer into that

Yesp

mettee · Apr 14, 2019

Coils are 12.5k vs 13.5k

Pistons are differnet(window/non window)

I almost bet the newer saws have less compression.

And mufflers are different

mettee · Apr 14, 2019

But they can all be made to perform the same with mods.

SOS Ridgerider · Apr 14, 2019

Got this little guy in the mail the other day. OEM, and what looks like manufacture date of 2012.

Edit: Take a look at the cylinder and the piston. 7900 cylinder with 7910 piston.

166 · Apr 14, 2019

mettee said:
But they can all be made to perform the same with mods.

Check the videos I just posted earlier. There is little to no difference in cutting speed between the two models.

My unofficial timing says the Makita EA7900 (PS-7910) was actually a tenth faster in the cut. Same bar and chain.

Adirondackstihl · Apr 14, 2019

166 said:
Check the videos I just posted earlier. There is little to no difference in cutting speed between the two models.

My unofficial timing says the Makita EA7900 (PS-7910) was actually a tenth faster in the cut. Same bar and chain.

Told ya

mettee · Apr 14, 2019

166 said:
Check the videos I just posted earlier. There is little to no difference in cutting speed between the two models.

My unofficial timing says the Makita EA7900 (PS-7910) was actually a tenth faster in the cut. Same bar and chain.

That is my point they are all similar. Even the 6400/6401/6421, they can be made to pefrom similar to the 7900/7901/7910/PS/DCS.

MustangMike · Apr 14, 2019

Steve, I watched your video and I'm still in the dark.

My conclusion - you film other's much better than you take selfies!!!

Wilhelm · Apr 14, 2019

Stock against stock the true and original "7900" will take the cake and walk away from her successor the "7910" - that is my best guess.

Modified, depends on the level of mods, skills of the individual modifying the saws, which direction the mods are aimed torque or rpm.

During this discussion You may have missed it , but @SOS Ridgerider just posted that he got an OEM "7900" cylinder (left hand DeCo, non SLR outlet) featuring a side slabed piston.

That should tickle some of You guys.
@Marshy did You get Yourself one of these for Your saw? I know You asked for one a while back.

Marshy · Apr 14, 2019

Wilhelm said:
Stock against stock the true and original "7900" will take the cake and walk away from her successor the "7910" - that is my best guess.

Modified, depends on the level of mods, skills of the individual modifying the saws, which direction the mods are aimed torque or rpm.

During this discussion You may have missed it , but @SOS Ridgerider just posted that he got an OEM "7900" cylinder (left hand DeCo, non SLR outlet) featuring a side slabed piston.

That should tickle some of You guys.
@Marshy did You get Yourself one of these for Your saw? I know You asked for one a while back.

I ended up buying a cheap AM top end from HL Supply on a black Friday deal. The saw I have is a basket case and I didnt spend much money. I wanted to try my hand at porting so I figured why not try on the 7900 with a cheap AM top end... I haven't done anything with it yet. I probably need to acquire a gasket kit and bearings also.

166 · Apr 14, 2019

MustangMike said:
Steve, I watched your video and I'm still in the dark.

My conclusion - you film other's much better than you take selfies!!!

Had the cell sitting on a cookie on a pine log in the rain!

First video is a low hour PS-7900 all stock.
Second video is my Demo EA7900 with the SLR chamber in the muffler and the lower rpm coil.

Same bar and chain and both saws were about identical in cutting times. Maybe a slight edge to the new saw.

Video was to prove the newer model does not have less power. But I need to get better video showing it.

Marshy · Apr 14, 2019

My motivator was having something to bring to Randy's GTG if by some chance I have the ability to go. Likely wont happen unfortunately because I have a busy summer planned and already plan on going to NY GTG and to Buckin Stock in MI.

tickbitintn · Apr 14, 2019

Who has the best deal going on a 7910 top end kit right now?
I need to get going on mine!

Sent from my XT1635-01 using Tapatalk

Wilhelm · Apr 14, 2019

Give Nate a call, last time I checked he had a good price on the OEM 7910 P&C kits.

https://www.performanceoutdoorequipment.com

I am certain others can help You out as well.

huskyboy · Apr 14, 2019

7910 cylinder has different fin casting on the cylinder... other than that, the different decomp location and the exhaust port there pretty much identical.

7900 on top.

166 · Apr 14, 2019

Will have a sale on Makita EA7900 GTG weekend. $655.20 PHO. $699 with 20" bar and chain.

Wilhelm · Apr 14, 2019

166 said:
Will have a sale on Makita EA7900 GTG weekend. $655.20 PHO. $699 with 20" bar and chain.

Damn!

166 · Apr 14, 2019

SOS Ridgerider said:
Got this little guy in the mail the other day. OEM, and what looks like manufacture date of 2012.

Edit: Take a look at the cylinder and the piston. 7900 cylinder with 7910 piston.

View attachment 177036 View attachment 177037 View attachment 177038

Those were used on late model PS-7900s sold in other parts of the world. There was a batch of those imported here that got kicked out by the Epa.

SOS Ridgerider · Apr 14, 2019

166 said:
Those were used on late model PS-7900s sold in other parts of the world. There was a batch of those imported that got kicked out by the Epa.

They’re still available. I just ordered another one now.

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

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