mods

what kinda mods could i put on my eiger that would give it more power to turn bigger tires

I'd go with a UNI Air filter, CDI box if they make one. DO NOT use a K&N air filter they let to much trash into your engine. I have seen them ruin 2 so far at the Yamaha dealer i work at. 5 at the Kawasaki and Suzuki dealer up the road in the past 4 years. I had friend that went on 2 rides and it gummed he EFI up on his wheeler. If you ride in any dust at all, don't use one. You could change your pipe out, if your's is a Auto you could go with a High lifter clutch kit.

how much more power would you think it would give be and how much do you think it would cost

UNI filter and CDI box about $200. teh rest if you have extra $$$

will that giv eme mch more power

Those 2 will help more than anything. The CDI will help it out alot, go with the Dynatek brand. The Uni filter is only about $20

how much power do you think it will give me

HP wise sI couldn't tell ya. But it willhelp alot. a cluthch kit will help alot also. but i can't tell yo how much HP, thats hard to guess. Just try those 3 things, you won't be sorry