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Re: engine noise
Here is a tip that may help during valve adjustment: Most of us do not have a feeler gage 0.001" thick (minimum clearance specified on the intake valves). Here is a way to approximate that small of a clearance measurement.
The valve adjuster screw on the GZ250 (at least on my 2007 model) has the following thread measurements:
Major diameter of valve adjuster screw = 4.81 to 4.83 mm (as measured by digital calipers).
Thread pitch of valve adjuster screw = 0.50 mm (as measured by standard thread pitch gage).
Doing the conversion math: 0.50 mm = 0.019685 inches. So, every full revolution of the valve adjuster screw will advance the screw 0.019 ". It follows that:
TURNS OF MOVEMENT
ADJUSTER OF SCREW (inches)
SCREW
1 0.019 68
1/2 0.009 84
1/4 0.004 92
1/8 0.002 46
1/16 0.001 23
Therefore, adjusting the intake valve to very light contact, followed by backing off the screw 1/16 of a turn will approximate a 0.001" clearance.
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