Free porting issues??? Causing over fuelling?

[Bigsquatch98]

Good morning all! I'm having some issues with a stihl ms 441... I bought a hyway big bore kit for it. And once I got it together I noticed there was a free port on the bottom of the piston on the exhaust side when the piston is at TDC. and now this saw is dumping fuel into the carb.. Is the free port causing this issue?? See attached for picture. Any and all help will be greatly appreciated! Thanks

 

[thompsoncustom]

I doubt your free porting is causing your fueling problems. explain in detail what's going on with your carb/fueling.

guessing your timing numbers are all jacked up.

 

[Bigsquatch98]

It fires up just fine when cold, fine great cuts great, if it idles for too long (less than a minute) it just dies. Then it won't hardly start, pull the spark plug, wet like it's flooded. But if you pull the plug before it's flooded it's perfect tan brown color.

Is there a way to change the timing numbers? Different gaskets maybe

 

[buzz sawyer]

Sounds like a carb issue - any changes there? L and H settings?
As for the free port, did you delete the gasket or go to a thinner one? Did you measure squish?

 

[Chevboy0167]

Um....... that looks suspect.... Piston looks to be deformed???? Bad casting? Not in backwards is it?

Yeah.... I second a need to do a squish test.

 

[Bigsquatch98]

Went with a thinner gasket, the H & L settings were set to stick, then adjusted with tach.. The squish is sitting right at 22 thous.

 

[J D]

Are you sure you haven't got the L on the rich side? Should be set to where you get the highest idle rpm then about 1/8 turn out. After that adjust Idle speed with the T (throttle stop) screw.
If you let it idle for 30 seconds then hit the throttle do you get a slight puff of smoke?

 

[thompsoncustom]

you can't use a tach and stock numbers to set up the carb on this saw, that's for 100% stock saws.

sounds like the L is set to high causing fuel to pool most likely in the intake rubber right where it meets the cylinder.

yes you can change time numbers but you need a degree wheel don't just start filing that usually doesn't end well.