810darren Posted February 13, 2006 Report Posted February 13, 2006 fmf recommends 280 mains and #30 pilot jets for the fattys.i have the carbs all ready done totally disasembled and cleaned every thing.i put them all back together.my question is will this be good jetting i will be running k&n no lid want to have head milled and maybe do a mild port job cause i will be redoing top end.motor is out so i want it to be right when i put it back in.fmfs are bran new bought it with stock pipes.what is a round about price for a mild port job anybody!!!!!!!!!! Quote
810darren Posted February 13, 2006 Author Report Posted February 13, 2006 fmf recommends 280 mains and #30 pilot jets for the fattys.i have the carbs all ready done totally disasembled and cleaned every thing.i put them all back together.my question is will this be good jetting i will be running k&n no lid want to have head milled and maybe do a mild port job cause i will be redoing top end.motor is out so i want it to be right when i put it back in.fmfs are bran new bought it with stock pipes.what is a round about price for a mild port job anybody!!!!!!!!!! 472749[/snapback] also needle is set at 3rd position they say nothing about moving it. Quote
Hilarious Posted February 13, 2006 Report Posted February 13, 2006 (edited) My guess is that you will need bigger jets when you get your jugs ported. As for what fmf recommends, my fatties came with 260 main jets and Im running 340's right now and my jugs are stock. Pretty far from what they recommend. Whom ever you get porting from should be able to suggest what kind of jets to start off with. Temp and elevation are also factors to figure in on your jetting. Edited February 13, 2006 by Hilarious Quote
Gargamel Posted February 13, 2006 Report Posted February 13, 2006 I ran 280 with lid and stock motor, so I would say you'll need bigger like in the 320 range with k&n and no lid, port work. But elevation, temp, and all the mods you do added up will be the info that will get you the most help. Your builder doing the port work will be your best person to ask. Quote
rjvoight Posted February 13, 2006 Report Posted February 13, 2006 At sea level in temps ranging from 55-75 with the mods in my sig : 310 mains 27.5 pilot stock needle position. Bike ran flawless. RJV Quote
Wallrat Posted February 13, 2006 Report Posted February 13, 2006 FMF's seem to love the needle in the 4th position (one slot towards the pointy end from where yours is now). With jetting its always better to start rich and go down from there. If you get it ported, talk to whoever does your porting about the jetting. If you stay stock, then I'd start with a 310 or 320, but that's without knowing your elevation or temperature. Porting runs anywhere from $200-$600. Quote
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