Squirt oil in your cylinders and recheck the compression. If your compression goes up you have bad rings. Check your valve tolerances to make sure that the valves are not being held open only because they are adjusted too tight. This would cause compression loss. If the valves were bent because the timing belts slipped or broke You may have to replace the valves to get compression back up. If the engine has low compression because there are 300,000 miles on the bike you may just need a complete overhaul or a new motorcycle. If you had at least 110 compression on all cylinders and they were all with in 10 pounds of each other you could still be riding on low octane fuel.
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