This is DOHC Bore up KIT, the ultimate tune of MONKEY type horizontal engine. Utilizing the know-how of 4-cycle tuning, the extremely compact DOHC 4-valve cylinder head designed from scratch made it possible to mount it on the MONKEY normal body.
 
compatible model:
 
monkey/gorilla
FNO,Z50J-2000001～
FNO,AB27-1000001～1899999
 
XR50R/CRF50F
All AE03 models
 
XR70R/CRF70F
All DE02 models
 
○Aluminum hard-plated cylinder
○Displacement
　: 88cc Bore diameter: φ52
　Stroke: 41.4mm (normal)
○Valve installed
○Piston: Forged/WPC + MOS2 processing (2R)
○Compression ratio: 11.3:1
*Strengthened for installation A crankshaft is required separately. A stock crankshaft lacks durability and may be damaged.