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Discussion Starter · #1 ·
my friend's honda '84 ATC250R is having problems with bogging out and irratic power band. are these some posible signs of a bad top end... possibly a loss of compression?

 
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Discussion Starter · #2 ·
Among other items, a loss of compression would be noticed throughout the power spread, but most noticably in the low and mid range. I would check that everything is in proper working order. New plug, clean the filter, check the jetting after that by doing a plug chop. 4th wide open, hit the kill switch, and pull in the clutch at the same time, coast to stop, remove plug and examine the color. The smoke ring about .2" down the insulator is where to look. Light brown is best. Go from there. Check that everything else is in order. No plugged vent lines, dirty elec. connections so on........

--Backcountry
 
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