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All Pit bikes carry a copy of the Honda CT110 Monkey bike engine that Honda released in the 1950’s.
The Chinese took this technology and bought the patent to the engine. Basically the 125cc is a supped up version of the Honda CT110. In there wisdom they used the same engine casings and engine barrel honed it out to fit 54mm piston and lengthen the stroke.
125cc Engines are now stable and reliable but there first release in the market there were a nightmare.
Some common problems for the 125cc (when 1st release)
o The clutches weren’t strong enough to handle the extra power that the 125cc had.
o The gear boxes were weak and you would usually lose 2 gear. Again increasing the power output without upgrading the rest of the engine.
o Over heating of the engine. The pistons used were only a garden variety . The aluminum would stress at high temperatures warping and burning out the rings. It would melt and the piston in the barrel. Ouch Not good.
o The inner seals on the side of the sprocket & clutch covers would burst and leak gear box oil because the pressure release valve would get jammed between the frame and the engine in assembly not allowing the engine pressure to escape.
o Crucial Engine internals such as piston, rings, bearings were getting made from cheap raw materials resulting in poor quality product.
The best 125cc engine and most common and reliable on the market is the Li fan engine. A close 2nd comes the Zongshen, Then Du car. The Jailing 125cc is the best racing engine built for the 125cc class but its a lot more expensive.
Some 5 years later the 125cc engines are now very reliable and 99.5% of all the problems have been ironed out. It just goes to show that vintage Japanese technology was far advanced for its time.
For More Tips and Tricks on Pit Bikes visit http://mini-dirt-bikes.blogspot.com
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