I realy need help blad dive into the log

[catskillpond]

Hey We had the same problem when cutting oak logs we saw some sparks coming from the guide side on the ceamic and we opened up the throat have you had any problems with the 23 hp back firing when it comes down to idle
Thanks  Scott

[Tom]

you will normally see a few sparks when the sun is low enough and the light is dimming.  The reason is that that the moving blade will hit the stationary part of the guide, or the lip on the back of the rotating guide wheel.   That is the purpose of those devices, to correct the blade when it goes on a tangent.  If you are getting a heavy stream of sparks, then the guide isn't straightening the band up and you know you have a problem.

Backfiring when returning to idle is common too.  It is usually a dirty carburetor, carboned up plug or carbon in the cylinder.  I used to run into it on my 24 horse Onan and cleaning the carb bowl usually fixed it. 

[metljakt]

Catskillpond has a brand new Norwood mill, (like maybe two weeks old).  I don't see how it could get carboned up s quickly.

[Tom]

Maybe not.   .........maybe so.  

Something is allowing the ignition of gasoline (out of time) after the throttle is closed.

[Bill Gaiche]

Sometimes the unburned fuel entering the really hot exhaust will ignite and makes a backfire. You may readjust your carb leaner or richer to see if this resolves the anoying noise. Some engines will do this regardless of what you do. Also check and make sure exhaust has no leaks, tighten bolts and clamps. If cold air can be sucked in on deceleration this can cause backfire also. bg