Stock 426cc with weisco 11.5.1??????

[dr qwerty]

I have a stock recently bored never taken out, 426cc 07 400ex.
What i need to know is this
1. Can i ride it stock,
2. should i add a filter and Jet or just filter, I really do not want to go out and buy a full exhaust yet, however i dont want my bike to run like ****. I was told i can ride my bike stock with the bore kit, is this true?

I know someone will tell me just buy all 3, well hell are you going to pay for it?

[TRXRacer1]

All you did was up the bore size and bump the comp, keep riding it as is.

[dr qwerty]

So, it will run fine as is.

Will it run like **** if i add a uni filter, i have one laying around.
Will jetting it and filtering back up the exhaust?

[TRXRacer1]

Originally posted by dr qwerty
So, it will run fine as is.

Will it run like **** if i add a uni filter, i have one laying around.
Will jetting it and filtering back up the exhaust? As long as you jet to your mods then you'll be fine. The stock exhaust will just hold you back power wise, not do any harm.

[dr qwerty]

Anyone else?

[pitkendall]

at the least u need to jet it up mostly if u put that filter on it cus 400ex's are lean from the factory any way and u made the bore bigger and the compression is higher so it will need more fuel and if u feel the exhaust is holding u back and have no funds (like most us americans these days) then take the guts out that stock muffler and rejet again just till u can buy atleast a cheap slip on or used pipe of ebay or craiglist or here