Well, l removed the head to my rz to fix a coolant leak coming from the top of the dome insert. It only has 8 miles on the motor. The bike ran well but I discovered the coolant leak.
Picture of the two piston are below. There was no evidence that the coolant was entering into the cylinder.
I was wondering how concerned I need to be? Any thoughts?
Thanks
IMO, that tiny amount of carbon only 8 miles into breaking in a new motor is normal. And only on the right side- unless you cleaned the left before the picture? Did you do heat cycles before starting to ride it to get 8 miles? On the coolant thing, you actually saw the leak and pretty confident you know what caused it and didn't enter cylinder, I don't know a simple way to look down past the pistons into the crank area to be 100% none want down inside- so you need to use your judgement how much risk you think there is buttoning it back up with the leak fixed. Others may give you better advice than me to work with.
I sold my RZ years ago but remember I had a coolant leak once too... and the way I found it was I came out to the garage 1 day and saw a puddle of vanilla milkshake under the bike. Turned out the impeller shaft seal went bad and let coolant leak into the clutch case and eventually overflowed it out the case overflow tube. You might just want to pull your dipstick and look for foam and also look in the radiator for foam to make sure coolant didn't leak somewhere else besides what you already confirmed?
weird they are not the same. but i wouldn't sweat it. is the RH crank seal fresh-ish?
Did the spark plugs and combustion chambers look the same? Coolant in the combustion chamber will clean the carbon out but if the coolant was coming out the top of the dome insert that's not in the combustion chamber.
@RDnuTZ-checked the trans fluid. Looks good. The coolant that came out or the radiator was also good.
Definitely not rushing it. This will be the third time trying to fix this leak. Not fun.
Quote from: m in sc on May 26, 2024, 04:37:24 PMweird they are not the same. but i wouldn't sweat it. is the RH crank seal fresh-ish?
I thought the same thing.
I did not rebuild this motor. However, all seals should be new. Although, the leak I am dealing with came with this newly rebuilt motor. So, ???
Quote from: 1976RD400C on May 27, 2024, 05:54:56 AMDid the spark plugs and combustion chambers look the same? Coolant in the combustion chamber will clean the carbon out but if the coolant was coming out the top of the dome insert that's not in the combustion chamber.
The right plug looked more oily then the left plug. The combustion chambers looked the same.