BMP E-TEC 860 Big Bore Kit


Regular price $1,999.00

  • 860 big bore top end kit fits all year 800 E-TEC models

  • 180 horsepower!

  • Huge mid-range and torque gain!

  • Hard to keep the skis on the ground!

  • A fuel controller, our performance manifold, and clutching changes are required.

  • For best results, purchase our complete big bore.

  • Turnaround time can vary from 1-15 business days for this kit depending on if core cylinders are in stock. Normal turnaround time is between 3-5 business days.

  • Must send in cylinders, exhaust valves (blades only), and head unless you select to purchase outright.

  • Use this Work Order Form when sending parts so shipping/receiving knows how to identify them. 

  • Part #: ADBM09-202


Cylinder Core Exchange Options (see drop down menu):

  • Option 1: Purchase Outright - No core cylinder, head or exhaust valves are required to be sent in - Raises kit price by $1500

  • Option 2: Exchange Parts, MUST send your cylinder, head and exhaust valves within 14 business days. As soon as you do, the $1500 charge will be refunded. Exchange parts not received in that amount of time will have no credit applied, and the customer will have to pay for return shipping. 

  • Option 3: Exchange Parts - Your order will be pulled on our shelf waiting for your exchange cylinder, head & exhaust valves to arrive. Once they arrive, we will normally ship the kit within a few business days. No core charge will be applied since we will have your cylinder prior to shipping the big bore cylinder. 




Get ready to blow your competition away! We have abused our 860cc E-TEC motor package for multiple seasons now and it has proven to be a winner! This kit has all sorts of grunt and torque that just keeps on pulling!! In the steep and deep of the Rockies, to the flat lakes of Michigan, this is the motor that just keeps ripping. We all know the E-TEC is a heck of a motor, but with our porting and custom Wossner pistons the E-TEC becomes a real monster! It produces 180 horsepower and over 120 lb/ft of torque with our stage 2 porting on pump gas. Simply send us you stock cylinder, head and exhaust valves(Blades only please). We will then bore your cylinders, port them, modify your stock head, and machine your exhaust valves. For the best results go with our complete big bore kit which includes everything you need for the big bore motor package.

Kit Includes: Exchange Cylinders, Exchange Exhaust Valves, Exchange Head, Pistons, rings, circlips, and wrist pins.

 Recommended Options: Power Commander 5, Performance Manifold, Boyesen Rage Cages or V-Force Reeds, Stage 2 Clutch Kit, & Top End Gasket Kit. If you are running low altitude, you will also want to purchase our Big Bore Muffler.

 ***Unless purchasing outright -  you must send in cylinders, head, and exhaust valves (Blades Only)*** Package all contents VERY CAREFULLY and insure the package. BMP is not responsible for damages that occur in shipping. Core parts must be in good, usable condition. Parts not in useable condition will not be credited and the customer will be respnosible for return shipping.

Click here to download the general big bore instructions

Watch the video below for proper engine break-in protocol: