Free 3-Day Express Shipping on Orders Over $99*

Shopping for Parts? Select Your ATV: Manage Saved Bikes Manage Saved Bikes Sport ATV Dirt Bike Sport ATV Utility ATV Sportbike Cruiser Make Year Model

Shop by ATV...

ATV:

  • Manage Saved Bikes Manage Saved Bikes Sport ATV Dirt Bike Sport ATV Utility ATV Sportbike Cruiser Make Year Model

Applied Refinements

  • Brand: Athena

Refine results by...

Athena ATV Big Bore Kits

Athena
Viewing results 1-4 of 4
Athena Big Bore Kit - 490cc - Athena ATV Big Bore Kits
Price: $699.99 - $899.99

FREE Shipping
SALE! Save 10%!
Athena Big Bore Kit - 480cc - Athena ATV Big Bore Kits
Price: $844.99
You Save: $91.00
FREE Shipping
Athena Big Bore Kit - 478cc - Athena ATV Big Bore Kits
Price: $489.99 - $769.99

FREE Shipping
SALE! Save 10%!
Athena Big Bore Kit - 435cc - Athena ATV Big Bore Kits
Price: $719.99
You Save: $80.00
FREE Shipping

Most Recent Big Bore Kits Reviews

Athena Big Bore Kit - 490cc Athena Big Bore Kit - 490cc Athena Big Bore Kit - 490cc rmz490 (Missouri, USA) great item!..check your gaskets.."installed 4 of these kits. last kit on kx450. finished install. rmed up. cooled down. ...""installed 4 of these kits. last kit on kx450. finished install. warmed up. cooled down. warm up. engine was quite and responsive. then I see that my engine oil is milky.. tear down. not fun the second time!! found small piece of gasket flash cut from coolant passage in center of the 3 piece head gasket. in the area between oil galley hole and coolant. see pics. contacted motosport and they helped me out and sent a replacment gasket set at no charge!!!. great customer service. replaced head gasket and ready to go!!! so check you gasket. the head gasket is a 3 piece riveted assy. just pull it open and inspect before installing.. thanks motosport!!"
See all reviews for this product[+] Expand Article[-] Collapse Article
Athena Big Bore Kit - 435cc Athena Big Bore Kit - 435cc Athena Big Bore Kit - 435cc 4bz1d1a (Florida) Athena Kit..."Bought the Athena as a base to start a stroker build on my '07 LTZ 400. The Athena ...""Bought the Athena kit as a base to start a stroker build on my '07 LTZ 400. The Athena kits are really high quality, and have been around a long time. You will not be disappointed.."
See all reviews for this product[+] Expand Article[-] Collapse Article
Athena Big Bore Kit - 435cc Athena Big Bore Kit - 435cc Athena Big Bore Kit - 435cc yergeau88racing (New Carlisle, IN) very nice"this was a rlly easy instaling it. the performance is rlly nice""this was a rlly easy instaling it. the performance is rlly nice"
See all reviews for this product[+] Expand Article[-] Collapse Article
Athena Big Bore Kit - 490cc Athena Big Bore Kit - 490cc Athena Big Bore Kit - 490cc karr (Rio Rancho, NM) LOVE IT!"This kit is amazing! I have it on my TRX450R and I would NEVER go back! Given en only ...""This kit is amazing! I have it on my TRX450R and I would NEVER go back! Given then only thing stock on mine is the frame, this made the biggest improvement to my bike! I love it! So, if you are looking for MAJOR power gain, this is the way to go!"
See all reviews for this product[+] Expand Article[-] Collapse Article
Athena Big Bore Kit - 490cc Athena Big Bore Kit - 490cc Athena Big Bore Kit - 490cc Moto450R (Orange County, CALIFORNIA) 490 Athena"Thisis an excellant product for the 450R. I have had one on my 04 450R for the last 2 ...""Thisis an excellant product for the 450R. I have had one on my 04 450R for the last 2 years. The bike hauls with this kit. I am purchasing another kit for another 450RI love it!"
See all reviews for this product[+] Expand Article[-] Collapse Article

Be Informed

Be Confident

Part of the Backcountry Family:
Copyright © 2004 - 2014 MotoSport, Inc. All Rights Reserved. Selected content copyright and trademark respective companies, used with permission.