Kawasaki GPX250R (1987) [240/248] 2 appendix
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Kawasaki GPX250R (1987) [240/248] 2 appendix

Kawasaki GPX250R (1987) [240/248] 2 appendix

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16 2 APPENDIX Additional Considerations for Racing This motorcycle has been manufactured for use in a reasonable and prudent manner and as a vehicle only However some may wish to subject this motorcycle to abnormal operation such as would be experienced under racing conditions KAWASAKI STRONGLY RECOM MENDS THAT ALL RIDERS RIDE SAFELY AND OBEY ALL LAWS AND REGULATIONS CONCERN ING THEIR MOTORCYCLE AND ITS OPERATION Racing should be done under supervised conditions and recognized sanctioning bodies should be contacted for further details For those who desire to participate In competitive racing or related use the following technical information may prove useful However please note the following important points You are entirely responsible for the use of your motor cycle under abnormal conditions such as racing and Kawasaki shall not be liable for any damages which might arise from such use Kawasaki s Limited Motorcycle Warranty and Limited Emission Control Systems Warranty specifically ex clude motorcycles which are used in competitive or related uses Please read the warranty carefully Motorcycle racing is a very sophisticated sport subject to many variables The following information is theoretical only and Kawasaki shall not be liable for any damages which might arise from alterations utili zing this information When the motorcycle is operated on public roads it must be in its original state in order to ensure safety and compliance with applicable regulations When a plug of the correct heat range is being used the electrodes will stay hot enough to keep all the carbon burned off but cool enough to keep from damaging the engine and the plug itself This tem perature is about 400 800 C 750 1 450 F and can be judged by noting the condition and color of the ceramic insulator around the center electrode If the ceramic is clean and of a light brown color the plug is operating at the right temperature A spark plug for higher operating temperatures is used for racing Such a plug is designed for better cooling efficiency so that it will not overheat and thus is often called a colder plug If a spark plug with too high a heat range is used that is a cold plug that cools itself too well the plug will stay too cool to burn off the carbon and the carbon will correct on the electrodes and the ceramic insulator The carbon on the electrodes conducts electricity and can short the center electrode to ground by either coating the ceramic insulator or bridging across the gap Such a short will prevent an effective spark Carbon buildup on the plug can also cause other troubles It can heat up red hot and cause preignition and knocking which may eventually burn a hole in the top of the piston Spark Plug Carburetor Sometimes an alteration may be desirable for im proved performance under special conditions when proper mixture is not obtained after the carburetor has been properly adjusted and all parts cleaned and found to be functioning properly If the engine still exhibits symptoms of overly lean carburetion after all maintenance and adjustments are correctly performed the main jet can be replaced with a smaller or larger one A smaller numbered jet gives a leaner mixture and a larger numbered jet a richer mix ture Spark Plug The spark plug ignites the fuel air mixture in the combustion chamber To do this effectively and at the proper time the correct spark plug must be used and the spark plug must be kept clean and adjusted Test have shown the plug listed in the Electrical System chapter to be the best plug for general use Since spark plug requirements change with the igni tion and carburetion adjustments and with riding condi tions whether or not a spark plug of a correct heat range is used should be determined by removing and inspect ing the plug 1 Terminal 2 Insulator 3 Cement 4 Gasket 5 Center Electrode 6 Side Electrode Spark Plug Inspection Remove the spark plug and inspect the ceramic insu lator

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