why woundn't my wr start

I have a 2001 wr400f. I have put a fmf powercore4 pipe on it, it went well for a while. Know it willnot start. It starts for a second and cuts out. I have changed the oil,oil filter, air filter, plug. Any ideas on what the problem could be. thankz guys

Have you fitted a full system or rear box,

tail pipe

I have 00 wr and caused myself months of sufferen cuz I had screwed around with the carb and unknowingly destroyed the carb joint between back of motor and carb. This $11 part is sensitve to your its clasp. Hope you find it!

t_o_d

I have 00 wr and caused myself months of sufferen cuz I had screwed around with the carb and unknowingly destroyed the carb joint between back of motor and carb. This $11 part is sensitve to your its clasp. Hope you find it!

t_o_d

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