TBolt USA is open and filling online orders and back up to speed!
Basic Questions: contact@tboltusa.comUrgent Support: Text 704-826-5887
[More Info Here]

TBParts - Stroker kit 3 108cc with Race Head
for Z50 CRF50 XR50 CRF70

Vital Information
Part No TBW0968
Stock Level 2 Left

TBParts Stroker Kit 3 108cc

This kit is the complete kit to convert your stock motor into a powerful open class 108cc engine with Race Head and VM26 carb!

Key Features:

  • 51mm Crankshaft with NTN bearings
  • High compression piston with rings, pin, & clips
  • Race Head with Large 25/22mm valves and porting for increased performance and big cooling fins.
  • High compression piston with rings, pin, & clips
  • Lightweight aluminum cylinder with steel sleeve, cast in mounts for skid plates, and large cooling fins.
  • High performance race camshaft 
  • 26mm MIKUNI Carburetor kit with intake, air filter, and throttle cable. 
  • Crankcase and clutch cover gaskets
  • Head gasket kit


  • High volume oil pump
  • Oil Cooler
  • Billet Clutch hub

Exceeds OEM Standard equipment


  • Honda Z50 - 1988-1999
  • Honda XR50 - All Years
  • Honda CRF50 - All Years
  • CRF70 - All years

 Kit Includes:

  • TBW0319 Crank
  • TBW0365 Piston
  • TBW0287 Gasket
  • TBW0334 Gasket
  • TBW0206 Gasket
  • TBW0301 Throttle cable
  • TBW0316 Intake Manifold
  • TBW0399 Carb
  • TBW0413 Air Filter
  • TBW0949 Race Head & Valves Assembly
  • TBW0300 Race Cam
  • TBW0156 Cylinder

This kit requires engine disassembly and therefore, we highly recommend a professional technician install this kit. If you plan on doing it yourself, you will need to have a Clymer or Honda shop manual. Instructions do not come with the kits but the installation of the crankshaft is just like installing a stock Honda crankshaft.

Recommend purchasing the Upgrade Disk Kit from TBoltUSA. Additionally, we do not recommend the use of an inner rotor kit with this clutch (on a 108cc or larger engine) as it can lead to premature clutch failure due to extra fatigue placed on the clutch housing. However, we offer an upgrade which allows use of inner rotor kits and larger displacement engines - Please see the Billet Housing upgrade available in this section for more details. Also, do not tighten the clutch nut with a hammer and screw driver - it must be torqued on. We have a tool for this at TBoltUSA.

See the TECH DATA for additional information on our performance products and links to instructions for the top end and oil pump.

Write Review

Since 2004, every purchase from TBolt USA includes access to technical support from our staff of experts and our online Pit Bike Technical Info Database!

We have all necessary support parts on hand.

Most orders ship same, or next business day, unless otherwise noted above.


Share Product
Share on Twitter Share via E-Mail