Quote:
Originally Posted by netdobeiras
.......... A: when did you have your valves adjusted and how bad was it?
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The condition of the specified gap between the stem of the valves and the rocker varies from engine to engine.
Please, read this:
http://faq.ninja250.org/wiki/Do_I_re..._6000_miles%3F
Sooner or later, those gaps become smaller as miles go by under the bike, reducing the breathing time of the engine and performance.
When they reach the lowest limit of the specified range, they don't fully close any more when the engine is hot, which induces leaks of compression and burned seats and edges.
From that point on, it is just a snowball of damage.
Consider cleaning and lubricating the cam tensioner during the valve's adjustment, because that thing can be the cause of unnecessary noise and wear and catastrophic failure.