jetting please help

[xcyfz450]

i have a yfz with a hmf slip on and no air box lid hmf said put a 180 main in so i did it was backfiring so someone told me to put in a 45 pilot now ive got back fire and flames can someone please help

[5valves]

45 pilot, start with a 165 main you might be able to go up from there.
neddle on the fourth clip, alot of people go to the fifth, but you have to file the top of the needle down about an 1/16 to 1/8" to get to fit.
I went with a yz450f (bike) neddle. on the fourth, my budies are running theres on the third. This is the needle that comes in the GYTR kit. Dont waist your money on the kit just go buy the jets individually.
I am running a 165 with a K&n and gytr full system.

[yfzmike]

I also have the hmf slip on .This is how I have mine set up :175 main,45 pilot,5th needle clip and the fuel screw3 1/2 out. Depend ing on your elaevation it varies but I live in Pa.