Any tips on what jetting to start with?

[Boostedmk2golf]

Hi, im building a warrior 350 (no clue what year, its a raptor frame but the motor has a warrior carb). Mods that matter are stage 1 hotcams cam, mildly ported head, some unknown aftermarket exhaust, cone air filter with no air box, +4mm stroker kit and +1mm 10.5:1 piston. runs choke on or off but only drives choke on, so i know it must be very lean (100% positive its factory jetting). im just looking on any tips on where to start jetting this thing, any help would be greatly appreciated!

 

[frit91]

I'd try a 47.5 pilot with air fuel screw about 1.5 - 1.75 turns out and a 160 main. Buy some new plugs and do plug chops till you get it about right. If the 47.5 seems too big, turn the screw in 1/4 turn at a time and try that. If you get to 1/2 turn out from lightly seated and it still needs more adjustment drop down to a 45 and start over again at 1.75 turns out. Plug chops will tell which way to go with the main jet. Give it a good thorough cleaning including blowing out all passages with compressed air first before doing anything. Good luck.

 

[Boostedmk2golf]

Alright so the only dealer in my area that was open today had no idea what I meant when I said I needed different jets and to come back and speak to one of the techs on monday. So I walked out and took a trip to harbor freight and picked up a micro drill bit set (60 gauge to 1 gauge) I cross referenced some sizes from gauge to mm and after a few tries I ended up with a 51 gauge bit (I believe that's about a 170 jet). Pulls pretty good full throttle now, slight midrange hesitation and that initial idle to part throttle transition just wants to stall. I figure during the week I will try out that 47.5 pilot jet, possibly adjust the needle and hopefully I'll be right where I need to be! Thanks!

 

[Boostedmk2golf]

I'll also add that I did try a 50 gauge and it broke up a bit at top end full throttle so I went back to the 51 gauge. 52 gauge just kept falling on its face when I tried to accelerate. That's pretty much how I ended up at the 51 gauge bit.