XT600 E 3TB 1992 camshaft clearance
Hi, I'm doing a topend rebuild on my XT600E. It had a blown head gasget where oil was going to the cylinder trough the head. When opening up the motor I saw that the bearing surface was not good anymore on the rocker cover, so I replaced it with a good second hand one. Seen in the pictures. I also inspected the camshaft journals and these are now out of spec.
Therefore my question. Should I run with this just out of spec cam shaft or should I buy a new after marked (new Yamaha is like 300euro) cam shaft to make sure bearing clearances will be ok?
I measured the journals of the camshaft:
Journal close to camchain: 22.962 mm
Journal in middle (3 locations): 22.966 22.975, 22.958 mm
Journal at oil inlet: 22.970 mm
Spec according to service manual is: 22.967 - 22.980 mm
For photo's of camshaft, rocker cover bearing faces and head bearing faces. see link below.
Camshaft
Cylinder head:
New rocker cover:
Old rocker cover (I did sand 600grid and polish the bearing faces but then realised that does not make much sense):
Last edited by Doker; 2 Mar 2025 at 08:33.
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