TB Parts

$329.00 USD 


170cc to 184cc Big Bore Kit and 28mm Carburetor Performance Kit 

If looking for easy bolt on power for the YX/GPX/Zongchen engines, this big bore and carb kit is it! Works great with your stock head or our new V2 Race Head.  The kit includes an all aluminum ceramic plated 64mm cylinder (with skirt) which will increase your engine displacement and power.  This cylinder is lighter than a steel sleeved aluminum cylinder, reduces friction (increasing power), improves sealing, and provides better heat transfer (runs and cools down quicker). We top off the bore kit with a 28mm performance carb kit that is easy to tune and works much better with this setup than your stock Chinese 26mm carb.  Additionally, our head gasket kit also includes a head o-ring set and exhaust gasket so you don't have to re-use your old ones or make a trip to your local dealer to get new ones and spend more money.  The new bore kit consists of high quality parts and requires no machining to the cases - bolt on and go! This kit is only for the YX/GPX/Zongchen 150cc to 160cc engines with a a KLX110 type topend. The increase in displacement will depend on your stock engine size. 

With this kit: 

  • A stock 150cc engine will increase to 170cc
  • A stock 155cc engine will increase to 177cc
  • A stock 160cc engine will increase to 184cc 

Key Features:

  • All aluminum ceramic plated 64mm cylinder with skirt
  • We increased the skirt height and size on the lightweight high compression 64mm piston with rings, pin, & clips to increase reliability and service life (picture is not updated yet showing piston change)
  • Head gasket kit - includes the cylinder head o-ring set and an exhaust gasket.
  • 28mm Performance Carb (125 main/50 pilot)
  • Rear Facing Intake Kit - not forward facing like the KLX110 style (picture is not updated yet showing intake change)
  • Jet kit for varying conditions and exhausts  

There are no installation instructions, but if you can replace your piston, you can install this kit. If you don't have any experience working on your engine, we highly recommend having a professional technician install this kit.

The parts are installed in the same manner as OEM parts.

Kit Includes:

  • TBW1250 - Cylinder
  • TBW0503 - Top end gasket kit
  • TBW0590 - Piston
  • TBW0301 - Throttle cable
  • TBW0556 - Intake kit
  • TBW0327 - Jet kit
  • TBW0490 - Carb
  • TBW0491 - Air filter