I personally have taken the rocker arms cover off my ’83 xt550’s head with the engine in the frame. It is tight but it can be done.
I have not taken off the head itself or the cylinder (engine in frame), but it is my understanding it can be done. You could try some searching on thumpertalk .com or advrider .com
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Yamaha XT600E '01, Honda XR400 '03, Yamaha XT550 '83
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