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Thats the thing, these motors are near bullet proof, thats why I was shocked when mine seized, I picked up another engine with 7000 kms on it had it professionally installed, and looked over. Everything was fine, took it home and anytime I'd punch it , coolant would blow out the overflow hose...

Ive also noticed the hole on 3 other 3 cyclinder 120s

Coolant level was good,I'm 99% sure everything was sealed properly, but always a chance somthing could have come loose I guess, was running perfectly, I let it warm up for about 5 minutes after temperature light turned off. Was about -25 out if not colder that morning. Rode up to the gas...

When I opened up crank housing, the oil cooler screens were full of ice and piston on clutch side had seized, oil was slushy and had been changed 200 kms before it blew with yamaha lube and new filter

There was rust around the crank bearing, rust looked to trailer around bearing and into crank housing, engine had 6300 kms on it

What do you think could allow atleast 2 cups of water into crank housing? Any suggestions?

Hey I just wanted to see if anyone else has noticed a small hole in top of crank housing. It seems yamaha didnt leave enough cast thickness, after tapping for the bolt. My engine blew last year and it was all caused by water blocking my oil cooler that I beleive over time seeped through the hole...