125-200cc '11 WR150 setting with fmf pipe/ silencer

Can anyone help me with jetting settings on this bike with the fmf gnarly and pc2 silencer? It has a really bad bog down low and is almost impossible to climb steep hills at a lower rpm. Yesterday in a harescramble i couldn't even let the clutch out without it cutting out. Unfortunately this happened 2 laps in. Now it won't even start. Plug color was a light brown. I am new to having to properly jet my own carb so take it easy on me! It's the mikuni tmx. Thanks, Nick

First check your float level. Most come way high. It should be about 8mm above the body just as it touches the needle. Then check the jetting sticky on proper jetting. I would think that a 30 pilot is a good place to start.