GY6 170cc Big Bore Cylinder Kit

Item No: 1182
Brand: PFS
SALE PRICE: $206.80
This item is not returnable

Use Code MEGA

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Buggy Engine Model*


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170cc Cylinder Big Bore Kit
Upgrade your GY6 150cc
Performance Racing parts to Dramatically Increase Performance. The stock GY6 150 cylinder is 57.4mm
Increases displacement to 170cc
Kit Includes:
  • Cylinder *
  • Piston
  • Rings
  • Wrist Pin
  • Gaskets
  • Use existing Rod


  • Bore: 58.5mm
  • Outer Sleeve Diameter: 60.3mm
  • Displacement Increase to 155cc
  • Overall Height (cylinder): 91.5mm
  • Stud Spacing: 76.5mm
Fits all of the following GY6 150cc engines: GY6 QMI/QMJ 152/157, Various unlisted makes/models
Roketa, Baja, Blade, BMS, Carter, Dazon, Hammerhead, JCL, Joyner, Kinroad, Tomberlin. Specify Engine model above.
Disclaimer: Performance Parts affect the reliability of your go kart and are designed for racing purposes only. Some machining and/or modifications may be necessary to install performance parts on your particular go kart. Manufacturers make modifications to their products from time to time and models may differ from year to year. Improper installation by an untrained mechanic can result in serious injury of death. Any damages, direct or incidental to a rider or property due to the installation of any performance parts are the responsibility of the purchaser. GokartsUSA makes no warranty as to performance parts, express or implied, including, but not limited to any implied warranties of merchantability or fitness for a particular purpose. Performance parts are not returnable for any reason. The logos and trademarks of each respective manufacturer belong to each manufacturer and they do not endorse or promote GokartsUSA in any way. GokartsUSA does not make any claim to represent or be endorsed by any of these manufacturers. All performance parts are not road legal! Closed circuit, off-road race, or exhibition use only!
Naraku 58.5mm Big Bore Cylinder Kit bumps GY6 150 to 170cc. The stock 150cc cylinder is 57.4mm. Easy to install! Just bolt on with no crankcase modifications needed.

Since you are skipping the Dealer and saving over half the retail cost, you will have some assembly to do.

Vehicles are shipped warehouse direct, in a crate, 95% assembled.

Customer must:

  • un-crate
  • perform initial vehicle setup
  • perform engine oil service
  • check and adjust all systems, throttle, brakes
  • check and tighten all nuts and bolts
  • perform break-in service after 1 hour of operation
  • by customer's mechanic at customer's expense

EVEN ON ASSEMBLED UNITS: Initial Vehicle Setup and maintenance must be performed by a qualified mechanic.

Initial Setup can include installing: wheels, seats, roll cage, lights, battery. Break-in Service must be performed after 1 hour of operation and can include: engine oil service, check and tighten all nuts and bolts, check and adjust cables, throttle, brakes, chain and all other systems.

Who can work on my Vehicle?
There may not be many Go Kart or Scooter shops in your area.

  • Small Engine Repair Shops
  • Garden Equipment Shops

These shops can help with Assembly, Repair or Maintenance. Often times, they can come to your house.

All Parts are available for online ordering.

All Manuals can be downloaded.  


The Manufacturer Warranty DOES NOT COVER REPAIRS. The Manufacturer covers parts only and labor is not covered under any circumstances. Any damaged or missing delivery items will be replaced. The warranty covers defects in material and workmanship and DOES NOT COVER repairs or damage due to operation.


To request support or initiate a Warranty Claim, please complete a Help Request . Parts can be purchased at any time on our website.

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BUGGY Speed Naraku 58.5mm Big Bore Cylinder Kit bumps GY6 150 to 170cc. The stock 150cc cylinder is 57.4mm. Easy to install! Just bolt on with no crankcase modifications needed. new 11-lbs // Red/Black/Blue PFS137-9 PFS