Picking up my new MS460 today.

[closetoreality]

I'm going to drill out the stock muffler port, and eventually get the dual port cover. My question is what size drill bit should I be using to open the stock port up, I don't want to go too big.

Thanks, and sorry if this has been repeated.

 

[chopperfreak2k1]

CONGRATS!! of course we will need pix you know? the exhaust port in the muffler should be right around 85% of the exhaust port in the cylinder i do believe.












i'm soooo jealous!

 

[blsnelling]

A drills not going to work for you. You need to remove the spark arrestor screen and then take a carbide burr and open up the port to the deflector edges. Then replace the screen. You really don't even need the dual port cover if you do this. It wouldn't hurt though either. Make sure you remove the muffler before you do any grinding.

 

[closetoreality]

ok and ill play around with the carb screws to fatten her back up a bit.

thanks for the heads up about the drill bits, i thought maybe a cobalt bit would get through it but ill pick up a burr.

 

[chopperfreak2k1]

hey man, i just noticed your sig. are you tellin me you're gonna have 2 460's? that's messed up! you know there are guys in the world that don't even have 1!!!!






















YET!

 

[closetoreality]

how much fatter will i need to run it if im opening up the stock port and leaving the stock cover?

 

[blsnelling]

how much fatter will i need to run it if im opening up the stock port and leaving the stock cover?

There's no standard amount. You have to "tune" the saw. I recommend you take it back to the dealer and have them tune it with a tach.

 

[closetoreality]

well i wanted to avoid them knowing i messed with it. i have a extra stock muffler incase #### goes south.

ill probably give it a few tanks for the rings to seat until i open up that port and adjust the carb. i know they come a little fat from the factory for break-in.

 

[blsnelling]

Long term, the best option use to learn to tune by ear. It's best to start with a tach though when learning. BTW, not all saws need the H needle richened up. The L needle always does, automatically richening up WOT fuel. That's why I say it has to be tuned. You just have to give the saw what it needs.

 

[closetoreality]

ill just fatten the screws out and adjust from there. so ill basically get her four stroking at WOT then lean her out untill i hear it stop four stroking.

 

[blsnelling]

ill just fatten the screws out and adjust from there. so ill basically get her four stroking at WOT then lean her out untill i hear it stop four stroking.

You want it to 4-stroke a little at WOT, but then clean up in the cut. If you let off the load, it should 4-stroke again.

 

[jropo]

Congrads on the new saw!!!

hey man, i just noticed your sig. are you tellin me you're gonna have 2 460's? that's messed up! you know there are guys in the world that don't even have 1!!!!






















YET!

Looks like you might want to start a 046 project!!! Just remember to bring the wife when you go to order parts at the dealer!!!!

 

[Raganr]

Congrats on the new saw. I went with a 460 for my first as well and am in the process of modifying the muffler.

http://www.arboristsite.com/chainsaw/189249.htm#post3368365

 

[closetoreality]

here it is.

 

[BigJ]

Make sure you remove the muffler before you do any grinding.

I just leave the saw running?

 

[closetoreality]

saw seems to be running a little fat...all the dealers must do is tune them real quick without a load...they dont have a log to test it out on so im going to tune it tommorow when its light out.

 

[cajunhillbilly]

Very nice! You are my new best friend...can I borrow it?:msp_biggrin:

 

[closetoreality]

hey if shes 4 stroking under a load is it ok to WOT off load for a few seconds to tune her in? i know your not suppose to hold it pinned when its new off load but must be ok to do it in spurts to tune it?

 

[mdavlee]

I just leave the saw running?

It might seem odd but i've drilled exhaust manifolds on diesel pickups with them running to blow the last little chips out.

 

[Trx250r180]

i did a simple muff mod on my 460 ,theres a little slice in front of the exhaust hole ,i just took my bar wrench and bent it open ,ended up with a nice port and the stock screen uneffected ,i have the dual port front cover also ,i dont know if can see it in this pic but this worked pretty good for me View attachment 215416View attachment 215417