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October 4, 2023 at 8:32 pm
#281335
I had a KF5 that acted the same way. Took off the waterjacket from the cylinder & exhaust/water jacket & stuck a piece of wire, long screwdriver & an ice pick in the water passage holes & sprayed carb cleaner in the water passages, then blew air & water thru & then had water flow thru everything backwards & forwards. Never saw a big chunk of anything but it ran very cool afterwards. If I may suggest check your gearcase drains too if byou havefreezing winters.