I have a 2002 Arctic Cat 300 4x4 (Green) and its smoking pretty bad..I found a good engine off of a 1999 Arctic Cat 300 4x4 (Red)..Will the 99 Model fit onto my 2002 frame and all hookup or would it be cheaper to just rebuild the top end on mine?

 

The Suzuki 280cc never changed it would be a straight bolt in job if you find a deal on one. The two ATVs have the same dimensions.

1999 Arctic Cat 300 4X4 ATVs

Top end rebuild is another good choice.

 

I can get a motor for about $500..mine is smoking pretty bad but everything works good on it..just debating on a complete top end rebuild if thats any cheaper and where to send the cylinder to be bored...and is there a good place to buy the parts from for this 4 wheeler?

 

You can call a Suzuki or AC dealer ,they usually make over size pistons and the cylinder are made to be bore out for them.
May be better that way you know you have a zero mile top end vs a used motor with god knows what on it for mileage.

Looks like they have it,you have to mail the cylinder out to get bored but the kits $177
99 02 Suzuki LTF 300 King Quad Top End Rebuild Kit Machining Service LTF300 ATV | eBay
Can,t hurt to call them and talk ,its toll free.