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Sale Items

290cc Big bore kit for all years YZ250F. 83mm bore 12:1 or 13:1 compression
  Quantity in Basket: None
Code: BBYZ290FM
Price: $500.00
Shipping Weight: 5.00 pounds
Choose piston:
12:1 JE 3 ring JE piston kit
13:1 Wiseco piston kit (Stroker compatible 310cc)(add $50)
YZ250f 290cc big bore kit. Bolt on kit for 2001-2010. Total for the basic kit: $500.00.

Includes Brand New aluminum nikasil plated 83mm cylinder.
83mm Forged JE piston kit, Cometic big bore top-end gasket set. This cylinder casting looks nearly identical to the stock cylinder casting from the outside, it even has 249cm3 cast into it. This is not a yamaha overbored cylinder, it is a Brand new Custom made Big bore cylinder. This is a bolt in kit, no case mods or any other mods needed to install.

Also available with a lightweight two ring design piston for an additional $50

Free UPS ground shipping in USA.
We will give $35.00 off if you send us your old cylinder.

$50 off when you order any two 4 stroke big bore kits - when ordering online their is no option for the discount, but we will deduct the $50 from your order before processing

Use the search box to find all the parts to fit your bike/atv or search for the specific items.

FREE SHIPPING on U.S. Orders of $50 or more
Email( or call(734-648-0103)