The following is an AltaVista Babel Fish translation of a Japanese web page which describes a JE Piston kit for the FTR223 and SL230. There is a distinct possibility that the engine in these two bikes is the same as, or similar to, the CRF230F engine. The 230F engine is actually 223cc and the stock bore is 65.5, which is mentioned in the text below. The original Japanese web page is here. There is also a chart showing kit numbers and prices here. The FTR223 kit is near the bottom of the chart.
The text below indicates that a 4mm overbore is used and that the liner must be replaced. Also, the engine cases need to be bored out to accept the larger liner.
The dyno chart show a gain from 14 to 18 (PS, metric horsepower), which is almost 30 %. Is that great, or what!
The company provides the kit only or complete engine modification and installation of the kit. Pack your engine and ship it now!
The piston looks so good, I think I'll order it just to have it, even if I never get around to installing a new liner.
Thanks to Karlznet (Benicia, CA) on ThumperTalk for the heads up on the web page. How do people find this stuff?
PS a note about horsepower. PS (the units on the chart below) is short for the German word Pferdestarke, the term for metric horsepower, also known as DIN horsepower. DIN is short for Deutsche Industrie Normen which simply translates to "German industrial standard". hp is the US standard for horsepower, while ps is the standard in continental Europe. One hp is equal to 1.0139 ps, making SAE horsepower roughly 98.6% of the metric DIN measurement.
For street Tracker FTR223 of large popularity of HONDA which it revives (you can use for also SL230 of the identical engine), it is the forging piston for long-awaited bore rise. As for bore size with the setting of 69,5mm and 4.0mm oversize, being the boring only, it is not possible to install easily, but when the total cubic displacement becomes 251cc, also compression ratio from the point of view of the 9.0:1 of normal, 10,5:1 and with setting of raising, installs, be close to power rise approximately 30% is carried out, (the power curve reference). Actually riding, when it receives, you can enjoy the power and torque in regard to 1 ranking.
As for price of piston kit, price 22,500 Yen. The cylinder for installing, processing the crankcase becomes price 45,000 Yen (Internet order price) with. As for process contents, production, sleeve replacement and precise boring of private sleeve. It becomes the crankcase prepared hole enlargement boring. Furthermore, the cylinder single unit and the crankcase single unit (please pull out also stud bolt) we accept replacement job in shape.
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