FmF power core 4 muffler-jetting

[Mike545]

2 things, just got a used fmf power core 4 muffler, the spark arrested has a hole in the screen how should i fix , and with what type of screen, 2nd other than that its stock, im in Pa elevation around 500 ft, what jets or jet should i use, i heard i should stick a #42 pilot jet in to aid starting , will this also help with the new pipe? thanks

[400exrider707]

yes the 42 pilot and the 152 main is what fmf recommends. I ended up using a 42 pilot and 155 main. Also your probably better off just buying a new spark arrestor from fmf. I think they are like $40 though and if you bought that used you probably dont feel like spending $40 more on and end cap, so you should be able to just get an end cap w/o the spark arrestor for like $20 or $25.

[Mike545]

where would you recomend the purchases of the jets, around here they look like im a waco for wanting jets, also i got the end cone off, a suppler or shop to get the spark arrestor? any help is greatly appreciated. :D

[ranger400ex1994]

i have that muffler with a power bomb headder and i run a 40 pilot and a 155 main jet.