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    1975 Yamaha RD350 - Engine noise after engine seizure repair

    I downloaded the Service Manual and thoroughly read Pages 16 to 21 (Cylinder/Piston) and 33 to 36 (Crankshaft). Learned a lot today !! Here is the direct link to the DS7/R5C/RD250/RD350 service manual for the reference. https://www.aircooledrdclub.com/manuals/DS7R5C.pdf
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    1975 Yamaha RD350 - Engine noise after engine seizure repair

    I took a picture of old pistons and made sure that the new piston arrows match the old piston arrow direction. They are pointing towards exhaust. Circlips were fitted properly and small end bearings are new. Ports are chamfered and feel smooth to my fingers. I also installed the correct head...
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    1975 Yamaha RD350 - Engine noise after engine seizure repair

    Yes, The Cylinder was overbored (1.75mm to be exact). I opened the head yesterday and noticed that the pistons don't reach all the way to head gaskets so no question of pistons hitting the inner metal rings of the gasket. I installed the correct size head gasket meant for RD350. Link below...
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    1975 Yamaha RD350 - Engine noise after engine seizure repair

    Hi All, I need your help in figuring out the engine noise i am hearing after installing the new pistons and freshly bored cylinder kit. My RD350 had an engine seizure due to lack of oil last month and i was hoping that the new piston kit and cylinder boring will take care of this issue. Please...
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