366cc Big Bore Kit,
Includes Piston kit & Top End Gasket kit

  Fits

  • Yamaha Warrior YFM350, 1987-2004
  • Yamaha Raptor 350, 2004-2013 
  • Yamaha Wolverine 350, 1995-2005
  • Yamaha Grizzly 350, 2007-2014

  Item Description & Information

  • Expect Gain of 2-4 HP with this Kit!

  Kit Includes:

  • JE Piston Kit: 
    • 12:1 Compression Piston, 85mm 
    • Rings
    • Circlips
    • Wrist Pin
  • Cometic EST (Extra Sealing Technology) Top End Gasket Set
    • Multilayer Steel Head Gasket
    • Base Gasket
    • Valve Stem Seals
    • and all the other gaskets needed to rebuild your top-end

This kit requires that your Stock Cylinder be Bored and Honed.  We offer that service for $75, or your local machine shop can do the work for you.  If you're interested in having us do the machine work, please contact us for instructions to send your cylinder.

  NOTES:

The compression ratio of this piston is 12:1.  We recommend that you run 95 octane minimum for optimal engine life.  Higher octane fuel burns cleaner and improves engine life -- and it's a lot cheaper than having to rebuild your top end!!

 

  Terms of Sale

PAYMENT:
Payment is accepted via Paypal or credit card.  Payment within 3 days via Paypal is preferred.

SHIPPING:

Items are carefully packed and shipped the same day as payment is received (or cleared), or the following day after payment at the latest.  Payments made after hours and weekends will be shipped the following business day.  You're welcome to pick up at the shop if you're local to the Phoenix, Arizona area.

RETURN POLICY:
Returns are accepted within 30 days of delivery date IF approved. Please contact us BEFORE returning your item for instructions. Items received in original condition, with all included materials, will be credited for purchase amount less shipping. Buyer pays return shipping costs.

  About Us

Pease Custom Performance (PCP) Offroad is a family-owned and operated ATV, Rhino UTV, and Dirt Bike performance shop. We service and repair all makes and models, and focus on giving you the performance you crave on the race track, trail or in the sand dunes. We carry products that we've used on our own bikes and know the guality.

We offer both new and used items for sale.  When we list used items for sale, we make every attempt to accurately and objectively describe and photo the items that we list including any damage that may or may not be present. 

Please feel free to use e-Bay's "Contact Seller" feature if you have any questions regarding this item.  We want you to be satisfied with your purchase!