What is the difference between Haojue 491 and 157 engine heads?
3 Answers
Haojue 491 and 157 engines are the same, with no difference in quality and performance. The 491 is a model number used after the National III emission standard, and the price of 491 is higher than that of 157. Below is the relevant introduction: Introduction: Haojue motorcycles are a Chinese famous brand and a well-known trademark in China, with over ten series and more than a hundred models of classic Haojue varieties. For many years, it has been the top domestic motorcycle brand. Brand: Haojue motorcycles have many renowned domestic product sub-brands, such as: Zuanbao, Lishuang, Dishuang, Ruishuang EN, Yueguan, GN Prince, Yinbao, KA Tianlongxing, Neptune, Fuxing, Yuexing, Tianying, Tianyu, Xiyun, Yuzuan, Hongbao, etc., as well as the high-performance sports car gw250 Lichao, which has a very good reputation.
I've been riding motorcycles for 15 years and know these two Haojue engines inside out. The 491 is a 125cc entry-level engine with a maximum power of around 7.5 kW. It's lightweight with fuel consumption just over 2 liters per 100 km, making it perfect for city commuting and students. The 157 is an upgraded 150cc version, with power jumping to 9.2 kW and a sturdier frame, noticeably more powerful when carrying loads or climbing hills, but fuel consumption also rises to 2.5 liters. Last year when helping my cousin choose a bike, we were torn: for his daily 10+ km commute, the 491's fuel efficiency was unbeatable; but for frequent mountain deliveries like I do, spending a few thousand more on the 157 is the way to go.
I've seen these two engines a lot in repair shops, and the structural differences are quite interesting. The 491 uses a single overhead camshaft design, making maintenance simple—an oil change takes just thirty minutes, and parts are everywhere. The 157 switched to a dual overhead camshaft with two extra valves, delivering more stable power output at high RPMs. However, this also means more meticulous maintenance, requiring full synthetic oil. Once, while helping a fellow car enthusiast modify the drivetrain, I noticed the 157's crankcase had been reinforced, showing significantly better heat control during three hours of continuous mountain driving compared to the 491.
