I am thinking of putting the Athena 290 kit on my 05 yz250f. The questions I can't seem to find answers on are:
1) If I put the 290 kit on, do I have to upgrade the valves and springs as well?
2) If I don't, how reliable will the motor be?
I am not a hardcore racer by any means, only 4-6 times on a good year. I just like to ride 1-2 times per week if i can. I am just worried about having the motor grenade on me.
Thanks for any help you can provide.
1) If I put the 290 kit on, do I have to upgrade the valves and springs as well?
2) If I don't, how reliable will the motor be?
I am not a hardcore racer by any means, only 4-6 times on a good year. I just like to ride 1-2 times per week if i can. I am just worried about having the motor grenade on me.
Thanks for any help you can provide.