Takegawa Super Head 4V+R 138cc Bore and Stroke up kit for Honda XR50 / CRF50 / XR70 / CRF70

TAKEGAWA Super Head 4V+R 138cc Bore and Stroke up kit for Honda XR50 / CRF50 / XR70 / CRF70

Super Head 4V+R (1 Cam 4 Valve)
Compared to the SP Takegawa Super Head +R's large diameter 2 valves, the SP Takegawa Super Head +R has 2 intake valves and 2 exhaust valves, which increases the valve curtain area and improves the intake and exhaust efficiency more than the large diameter 2 valves.In addition, the head shape was designed to balance the center plug, valve pinching angle, combustion chamber shape, and port shape in order to achieve high power output and sustained output characteristics in the high RPM range, which is the biggest feature of the Super Head.

Product detail:
     SCUT 138cc 2 point support crankshaft
     Bore Diameter: 57mm
     Stroke volume: 54mm
     Compression ratio: 12.6: 1
     Included Camshaft: 20 / 25D
     No crankcase modification required
     Intake: 21.5mm x 2 / exhaust: 18.5mm x 2
     Valve Stem Shaft Diameter: Intake and exhaust both 4.0mm

*Old part number: 01-06-8120

**When the 124cc / 125cc / 138cc engine is installed, the length of the engine becomes longer and the engine interferes with the tire with the stock front fork, stock top bridge and stem, so the front end needs to be changed.

*For ALL Z50 / CRF50F / XR50R and CRF70F / XR70R
SP Takegawa does not sell front fork kits.There are some aftermarket frame and front fork kits on the market, but SP Takegawa has not confirmed the installation of these kits.You are responsible for your own vehicle installation.

If you have any questions please call one of our knowledgeable and friendly techs at 833-327-8507