The SP crankshaft is balanced to match the typical piston weight of a 50mm-54mm piston diameter.
The balance ratio has been optimized to approximately 25%, the ideal for horizontal engines, reducing vibrations, while the connecting rod cross-sectional area has been increased to enhance rigidity.
High-speed type crank side bearings are used for superior sliding performance at high rotational speeds.
- Total weight of piston assembly (piston, piston rings, piston pin, pin clip) is approximately 90-115g for optimal balance.
- Stroke: 41.4mm
- Crankshaft assembly weight: Approximately 1725g (normal weight 1810g)
- Woodruff key and crankcase gasket included
- High-speed bearing 6304L1C3 included
[Compatible models]
Monkey/Gorilla (12V): Model Z50JN/P/S/T/V/W/X: Frame number Z50J-2000001～, Model Z50JY/1/2/4/5/6/7: Frame number AB27-1000001～
Monkey Baja: Model Z50JN/N/P: Frame number Z50J-1700001～
Monkey R: Model TZ50JRH: Frame number AB22-100017～
Monkey RT: Model Z50JRJ-2: Frame number AB22-1007601~
* Not compatible with FI models.
Compatible models: Monkey/Gorilla (12V), Monkey Baja, Monkey R, Monkey RT
SP crankshaft balanced to match the weight of a typical piston with a piston diameter of 50mm-54mm
Reduced vibration through balance adjustment (approximately 25%) for horizontal engines, and features a reinforced connecting rod and bearings that rotate smoothly even at high RPMs.
Stroke: 41.4mm. Crankshaft ASSY weight: Approx. 1725g (Normal weight: 1810g)
Includes Woodruff key, crankcase gasket, and high-speed bearing (6304L1C3). Can also be used as a replacement for the genuine crankshaft.
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