I am now working a bit on the XT250 head, and found a couple of things I wonder what to do with (or leave as is.
One is a notch from a cutting tool, towards cylinder centre, approx 1- 1.5 mm deep, 10 mm long, crescent shaped. See first attached picture.
Then there is a step between the intake port and the last 4 mm before the valve seat, maybe 1-1.5 mm high, for about 130-140 degrees of the seat circumference, basically from 4:30 to 9'o clock on the second picture. The third pic just shows the valve seat, and the amount of aluminium behind it where said step is found.
The last two pics show the same step viewed from the carb end of the intake port.
What to do? Leave well alone, or grind at least a little bit?
One is a notch from a cutting tool, towards cylinder centre, approx 1- 1.5 mm deep, 10 mm long, crescent shaped. See first attached picture.
Then there is a step between the intake port and the last 4 mm before the valve seat, maybe 1-1.5 mm high, for about 130-140 degrees of the seat circumference, basically from 4:30 to 9'o clock on the second picture. The third pic just shows the valve seat, and the amount of aluminium behind it where said step is found.
The last two pics show the same step viewed from the carb end of the intake port.
What to do? Leave well alone, or grind at least a little bit?
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