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

huskyboy

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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

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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

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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. ;):icon_popcorn:
Looks and sounds good.
Any pics of finished exh port for comparison?
 

huskyboy

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I believe you need a bigger stick to really show the improvement there. ;):icon_popcorn:
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. DA51C3F8-71EF-42C2-9C4D-A031B4B35092.jpeg E4CF8A6E-E4AC-4D0D-A6AF-B2A2682E162B.jpeg I did not change timing numbers or touch the transfers. Just widened the intake and exhaust.
 

tickbitintn

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