Fatboy 4 exhaust

[dalejiw25]

Hey there
I've got a nicely modded 1999 400 ex. I was runnin a White bros complete exhaust with an empty can(obnoxiously loud !!!) I put the Fatboy 4 complete system on with the baffled can and now she wont start. I wouldn't figure a rejet would be necessary seeing how they're both bad-*** exhaust systems in there own right. Maybe the back pressure with the baffles on the Fatboy ??? seems like it's flooding out. A carb. genius I am not. Any help would be appreciated....Thanks.

[Drewltr450]

Valve clearences.

[Toadz400]

Rejet. Every exhaust system is different and the baffle makes a HUGE difference.'

Also, since you're working on a 400EX you can go ahead and check your valve clearances for good measure. It's so easy to do on those engines it's definitely worth your time.