kit 490cc for my trx 450R

[leechi]

Hello, i got a 2005, trx 450R, i race MX, and i looking for a 490cc

my dude is if this 490cc kits are safety, or crash the engine whit the time?

or is better for safe, put only a hotcams stage2?

i only got a sparks full system, uni filter and protec power lid

thanks!!!