parrisw
Tree Freak
I agree with Brad, run that thing like you stole it.
Why, it runs richer and cooler at part throttle ? I've got it set so rich that fuel dribbles out of the muffler. :hmm3grin2orange:Forget letting the saw idle through tanks of fuel like that. Also, part throttle bucking is a no no. WOT always when in the cut like that.
Why, it runs richer and cooler at part throttle ? I've got it set so rich that fuel dribbles out of the muffler. :hmm3grin2orange:
Finally had a chance to put a couple of tanks of fuel through the 066 after aggressively honing the cylinder.
Compression did get better -- 131 psi. Whoop - pee - doo.
-- used OEM jug, with pop-up and woods port. I would lean toward OEM if I could get a pre-emissions jug at a reasonable price, however, the 660 jugs seem to have tame compression and radical exhaust timing, so I wouldn't be willing to spend a lot of money on a 660 jug.
Rumor has it that older 066 jugs had more compression and less exhaust duration than current 660 jugs, and that Stihl detuned it somewhere along the way to comply with emission standards.not sure what you mean by pre emission jug? but my stock 660 with muff mod has 165psi cold,that seems good to me![]()
If you are trying to make me jealous, you are succeeding. :hmm3grin2orange:I just ported my 064 with "almost" new rings and it has 170psi.
If you are trying to make me jealous, you are succeeding. :hmm3grin2orange:
If you are trying to make me jealous, you are succeeding. :hmm3grin2orange:
My 395 has about 200psi! Want me to build you one? LOL
My 460 I had and modified had 210psi, it was a real arm breaker.
How big is the combustion chamber and how tight is the P to C clearance?
zero squish volume with OEM piston = 9.5 cc
zero squish volume with pop-up = 8.75 cc
If I had to do it over again, I'd probably get a 395 instead of an 066. I'm not sure what the chamber volume/timing specs are on the 395's, but I get the impression the 395 is a better design.parrisw said:My 395 has about 200psi! Want me to build you one? LOL
I can only dream about 210 psi.StumpStomper said:My 460 I had and modified had 210psi
timberwolf said:Exhaust 180.8 deg
Intake 153.4 deg
Transfers exhaust side 116.6 deg
Transfers intake side 123.0 deg