You can do a compression test and compare the two bikes. If compression is low, check again but pour in a teaspoon of 20/50 motor oil into the spark plug hole before testing. If the compression goes up then you can suspect the piston rings are causing a loss of compression. Instructions for head removal are on Utube.com. You will need to inspect the piston and cylinder for wear to determine what parts will be needed for repair. Low compression can be felt at the kick starter too; how much compression do you have to overcome to turn engine over
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