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

[166]

I was talking factory installed with that piston on PS-7900's here.

 

[SOS Ridgerider]

Ah, I see. Thanks for clarifying Steve. I haven’t seen those top ends available for purchase anywhere before, but then again, I don’t get out much. Lol.

 

[SOS Ridgerider]

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

Will there be any 7300’s for sale? That’s the one I’m missing.

 

[166]

Will there be any 7300’s for sale? That’s the one I’m missing.

Not at the moment but could have. I do have the heated handle version in stock.

 

[166]

Damn!

20% off all saws!

 

[tickbitintn]

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

Where from?

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[SOS Ridgerider]

Not at the moment but could have. I do have the heated handle version in stock.

Interesting. Thanks Steve. I’ll pm you tomorrow.

 

[SOS Ridgerider]

Where from?

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This is where I got mine from Mark:

https://sleequipment.com/makita-genuine-part-038-130-070-cylinder-piston-cpl-dcs7901.html

 

[tickbitintn]

This is where I got mine from Mark:

https://sleequipment.com/makita-genuine-part-038-130-070-cylinder-piston-cpl-dcs7901.html

So that has decomp on flywheel side?

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[SOS Ridgerider]

So that has decomp on flywheel side?

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Yes, sir.

 

[huskyboy]

Mike lee’s solo mod... nothing new here...

 

[huskyboy]

Let’s smooth that ridge since this saw is not running a 7910 muffler.

 

[huskyboy]

Finished the 6401/7910, same mods as my 7900 and widened the intake/ex same as the 7900. Same timing advance/carb mod. Difference is I did not give it more intake duration like the 7900. Cut times went from 10-10.5 seconds to about 7.5 seconds... which is a good difference in this small POS test log I have lol. It beat my 7900. The torque is impressive, you can really push on this saw compared to stock.

 

[huskyboy]

I’m thinking the intake timing and having a screen in the muffler slowed my 7900 down a little. I’m ok with that. I can always add another muffler port with screen (I have to run screens for logging) or get another piston since I cut the skirt to get more timing.

 

[tickbitintn]

Finished the 6401/7910, same mods as my 7900 and widened the intake/ex same as the 7900. Same timing advance/carb mod. Difference is I did not give it more intake duration like the 7900. Cut times went from 10-10.5 seconds to about 7.5 seconds... which is a good difference in this small POS test log I have lol. It beat my 7900. The torque is impressive, you can really push on this saw compared to stock.

I believe you need a bigger stick to really show the improvement there.
Looks and sounds good.
Any pics of finished exh port for comparison?

 

[huskyboy]

I believe you need a bigger stick to really show the improvement there.
Looks and sounds good.
Any pics of finished exh port for comparison?

I agree, need a 30” piece so I can bury the 32” bar with a 8 pin to show where the power is really at. I did not change timing numbers or touch the transfers. Just widened the intake and exhaust.

 

[huskyboy]

Stock wash on the piston, thought it looked cool.

 

[tickbitintn]

I agree, need a 30” piece so I can bury the 32” bar with a 8 pin to show where the power is really at. View attachment 177202 View attachment 177203 I did not change timing numbers or touch the transfers. Just widened the intake and exhaust.

Yes I believe that would really show the gains.

 

[tickbitintn]

My problem right now is test wood also. Not the lack of big sticks to cut but the lack of access to the big sticks I have, or a means to make them accessible.

 

[huskyboy]

When I get back to logging again I’m gonna try to use the excavator to put a good size junk log in the back of my pickup... if the boss doesn’t mind lol