What is it?

Slap that finger bad! Is what will happen

 

I can answer that for him!

 

and how the saw start ?

 

If your only pulling slowly the pawls may not catch.

 

I was thinking the starter bolts may be loose or one missing and pull it at an angle it will just pull past the engaging things and slip by.

 

yes sometimes i have notice this

 

You can have scoring like that and still have compression if the scoring does not go across the rings where the aluminum transfer stops the ring from sealing against the cylinder wall.

 

take of the deco valve and clean it and also clean the place that the deco sit

 

If the saw starts and runs to your satisfaction I'm not sure what the problem is.

Could this be an indication your headed for a parts or saw failure. Maybe. My guess is starter pawls are getting worn and won't engage when the rope is pulled slow but will when pulled fast. Sometimes this can feel like the motor is turning over but it is really the pawls just rubbing trying to engage. I say start saving your money, run the hell out of it and when it grenades go get another shiny wood cutting thingamajiggy or replace the part that fails as you see fit.

If your like me you show the cfo... I mean the missus... what's going on. That way when you adopt a new saw she doesn't flip out so much.

 

This plan....is a good one

 

Also...just a long shot I know...But I've bought saws on a whim......that don't didnt have good compression. Got them home...they had very loose spark plugs. A little tightening....back to normal

 

Good call!

 

As the operator have say the saw cut very strong and the cylinder - piston looks good , the problem start when he open the saw for cleaning it .
maybe the saw is ok and he dont have fit good the parts ..........
I am now waiting what the operator will say if he find the problem

 

I have no patience for waiting lol

 

I have an ebay husky 55, with a terribly scored piston and 120 psi, starts and runs fine. Not as well as it should but good enough for now. It gets lost on a lot of guys that two guys doing the same compression check will almost certainly get different results. How hard can u pull the rope? How many pulls? Throttle wide open?

 

I use the compression tester just for having the first idea of what hapend, but if something dont smell good to my nose i always take off the cylinder to see if everything is ok , take 5 minutes more, but it give me the best results about the saw condition

 

And for those who disagree that need only 5 minutes for take off a cylinder..........

 

Although you're right in that folks seem to struggle with technique, it's really very easy. Two guys who know what they're doing will get the same results using the same gauge on the same saw. Most discrepancies come from an inaccurate gauge which is not uncommon.

How hard to pull the handle? Just like you're trying to start the saw, but frankly you can pull much slower than that and still get a reliable number.
How many pulls? There is no magic number. To get an accurate reading you pull until the gauge stops increasing.
Throttle wide open? Throttle position has absolutely ZERO influence. Compression is built above the intake port.