7 or 8 pin for ported 661 with 28" bar

[gsrsol84mm]

Would you run a 7 pin or 8 pin for a ported 661 with 28 inch 3/8 bar and full comp RS chain. Also have 36 inch bar 3/8 .050 RS chain for occasional use.
Mostly oak and other hardwoods for bucking up logs.

Thanks

 

[ZeroJunk]

Would you run a 7 pin or 8 pin for a ported 661 with 28 inch 3/8 bar and full comp RS chain. Also have 36 inch bar 3/8 .050 RS chain for occasional use.
Mostly oak and other hardwoods for bucking up logs.

Thanks

I would stick with the seven for that length.

I had a MS660 with a 20 inch bar and 8 tooth. It actually cut too fast if there is such a thing.

I'm thinking the difference would be trivial.

Ported can mean anything, more often than not, nothing.

 

[gsrsol84mm]

thanks for the reply, saw is on the way to us and currently has 8 pin and was considering a 7 pin.

 

[NSEric]

I'd run the 7.
They oil better with the smaller sprocket, the 8 lets more dirt into the bar grove plugging up the bar oil hole sooner.
I have ran both on my 660 clone, it's faster with the 8 in the smallish stuff I cut but I never have to clean the bar oil hole out on the bar with the 7.

 

[HumBurner]

Would you run a 7 pin or 8 pin for a ported 661 with 28 inch 3/8 bar and full comp RS chain. Also have 36 inch bar 3/8 .050 RS chain for occasional use.
Mostly oak and other hardwoods for bucking up logs.

Thanks

"Gear" up the sprocket count, increases rpms and reduces torque.

"Gear" down the sprocket count, decreases rpms and increases torque


For bucking, generally speaking, you want torque. For falling, you want more speed. For milling, you want torque (and maybe speed.)

 

[jblnut]

I run a 7-pin on my 066 and 32” bar in oak and it does okay. To go to an 8-pin I need to run a full skip chain and it cuts slower, which makes sense.

I’d try it both ways and see how it goes

 

[gsrsol84mm]

Thanks for all the replies. Ordered the 7 pin OEM Rim Sprocket kit and will give it a try.