066/MS 660 port #'s. Please share your stock #'s

[komatsuvarna]

181-281-288 is a good family of saws that responds well to finger ports. No piston mods to make either, the ring pin is in the center.

I done a set on a 181. Put in a nice wide set and made them open 2° before the main transfers. It ran pretty good....

 

[komatsuvarna]

 

[wigglesworth]

I've seen factory early non decomps at 99 on the exhaust, with a gasket...

 

[wigglesworth]

I had 3 different ones off 066s and they were all different. The KS was like chad said. 95 exhaust and 27-28 degrees of blowdown and 80 intake. I have checked 6or 7 cylinders that I remember.

KS? As in Kolbensmidht ?

Only seen one non-decomp KS 54mm cylinder. Seen several 064 KS cylinders...

 

[wigglesworth]

Ain't had a wheel on it yet...

 

[mdavlee]

KS? As in Kolbensmidht ?

Only seen one non-decomp KS 54mm cylinder. Seen several 064 KS cylinders...

Yeah the new stihl cylinders are KS also.

 

[wigglesworth]

Yeah the new stihl cylinders are KS also.

I see. This is an old school non-decomp I have...

 

[Deets066]

I'd cut the squish to get the exhaust down to 100, then set the transfers at 118, and leave the intake port untouched.

Would I benefit from bridge ports? I know ya put them in the 064, does the 066 benefit from them as well?

 

[Deets066]

My new piston is a KS

 

[mdavlee]

I see. This is an old school non-decomp I have...

I never seen one of those.

 

[wigglesworth]

I never seen one of those.

Me either, till this one.

 

[mdavlee]

Me either, till this one.

I bet it's probably got good numbers like the 64 cylinder.

 

[wigglesworth]

Pistons are different too...

Non-decomp vs KS non-decomp

 

[Deets066]

 

[Deets066]

0.17 shorter than original Oem piston

 

[komatsuvarna]

She running yet, Deets?

 

[Deets066]

Having squish issues, from wrist pin to top of piston the KS measures .017 shorter. Original squish was .018, base gasket is .018. Checked squish with new piston and gasket in four places and had .036-.038. Remove the gasket and it feels like it's barely hittin, it will roll past TDC, but can slightly feel a catch. Squish with no gasket measured mostly .017-.019, one spot read .012 Checked three times, but this doesn't explain the catch I'm feelin. Tomorrow I'll spray blueing on piston and roll her over a few times, maybe I have a high spot somewhere??

 

[big t double]

Having squish issues, from wrist pin to top of piston the KS measures .017 shorter. Original squish was .018, base gasket is .018. Checked squish with new piston and gasket in four places and had .036-.038. Remove the gasket and it feels like it's barely hittin, it will roll past TDC, but can slightly feel a catch. Squish with no gasket measured mostly .017-.019, one spot read .012 Checked three times, but this doesn't explain the catch I'm feelin. Tomorrow I'll spray blueing on piston and roll her over a few times, maybe I have a high spot somewhere??

opcorn:

 

[Deets066]

The blueing trick didn't work out for me, couldn't see any markings on piston

 

[big t double]

It sure looked tight through the plug hole...I doubt this is it from the way it felt to me but do you think the catch is the magnets on the flywheel grabbing the coil?