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Athena Factory Cylinder Kit
Athena Factory Cylinder Kit

$602.99 - $689.99
15% Off - Save up to $121.96

Description See Also: 5 Reviews 21 Questions Fitment Part Numbers
Item #ATH0008

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5 Reviews
4.2 out of 5 stars
5 Star   4 4 Star   0 3 Star   0 2 Star   0 1 Star   1
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All Reviews
Verified Purchaser
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Excellent Head

Easy to install and give tons of power.

Durability 1/5 Ease of Installation 1/5 Performance 1/5 Power 1/5 Style 1/5
Stock Cylinder bore

Purchased a stock bore Athena replacement cylinder. Would've been nice to know they intentionally spin the stud bold holes 180 degrees so you have to buy their cylinder head. Next time I'll just spend the extra money and buy an OEM jug. Not worth the hassle of going aftermarket.

Verified Purchaser
Arlington, WA, USA
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 5/5 Style 5/5
Very complete kit

With v force reeds this thing runs super clean and crisp. Good power.

Winter Garden, FL
Durability 5/5 Ease of Installation 5/5 Performance 5/5 Power 4/5 Style 5/5
Good Buy

My stock cylinder was trashed. Picked up the Athena kit and after the simple install there was noticeable performance gains.

Mill Creek WV
Durability 5/5 Ease of Installation 4/5 Performance 5/5 Power 4/5 Style 5/5
Top End Kit

Bought this kit for my YZ125 that I had blown up. It was super easy to install and got me back into the season without missing a race and the bike seemed to have a little more power also.

21 Questions
Answered:   18
Not Yet:   3
Q: My 05 yz125 have the athena standard bore kit with the copper head I run it with a br9eg spark plug. I tried loctite on treads but it keeps comming out anyway, is there a specific spark plug for this head?
2 months ago
Top 10
2 months ago
A: You are running the correct plug for that application. I would suggest contacting Athena to discuss a possible manufacturer's warranty issue.
Q: My exhaust off my 98 yz 125 won’t fit I bought this kit what pipe would I have to buy for it ?
2 months ago
Top 10
2 months ago
A: We would need to know more about which exhaust you are running. Please give us a call so that we can help you solve your issue.
Q: My 02 yz125 has this cylinder kit on it. The head gasket has blown. Where can i find the right size o-rings for this cylinder?
3 months 5 days ago
Trevor Gearhead
Top 100
3 months 5 days ago
A: Athena Cylinder Head O-ring Kit - Manufacturer Part # P400485999003 I would recommend ordering from Athena directly
Q: I installed kit the piston seams to be hitting head . Does the kit need to use the Athena gasket set ? It kits over but stops at dead top and wont move.
4 months 8 days ago
Top 10
4 months 8 days ago
A: No, the Athena head gasket is not necessary when installing the Athena piston however it is recommended.
Q: Do you have to use the Athena power valves? Or can I use stock ones for the factory cylinder?
1 year 8 months ago
Will help me a lot thanks!!!
Top 25
1 year 8 months ago
A: The Athena Factory Cylinder kit will be sold with Power Valves.
Q: 144 kit?
1 year 8 months ago
Is this considered a 144 kit or completely different?
Q: I just want to make sure that the kit comes with power valves, cylinder, head, gaskets, and ect please reply with detailed list for i will be purchas
1 year 10 months ago
I want to purchase this kit. But need full description on everything it includes
Q: Exhuast fitment
1 year 10 months ago
With the Athena head on my 1997 Yz 125, my 2 stroke pipe does not seem to fit the exhaust port at all, as it protrudes from the cylinder instead of mounting the header in the recessed port on the stock cylinder head. Do i have the wrong exhaust as all stock exhaust should fit?
Q: Athena factory cylinder kit
2 years 2 months ago
Spark plug keeps coming out of the copper head. Never had this issue with the OEM head. What is causing this problem?
MotoSport Staff Expert
2 years 2 months ago
A: I would add a small amount of tread lock.
Q: What jetting would you recommend on a 2003 kawasaki kx 125 that has v force 3 reeds?
2 years 2 months ago
Expert MotoSport Staff
2 years 2 months ago
A: There is not a specific setting I could give you for jetting your bike. It would really depend on your location (altitude/temperature) and how your bike is running with the current jetting. Jetting can be very tricky, there isn't one setting that will work everywhere with every bike. I would recommend taking your bike to a local motorcycle dealership’s service department to have your bike properly jetted.
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# Part Numbers
Product Variant Manufacturer Part #
Athena Factory Cylinder Kit P400250100001
Athena Factory Cylinder Kit P400485100003
Athena Factory Cylinder Kit P400485100017