ninjette.org - View Single Post - Possible Coolant Issues and Overheating on an Ex-Ninjette Bike

jkv45 · July 22nd, 2017, 01:00 PM

Talked to my buddy with the RC. He said they felt they solved the problem by replacing the ECU. That was after swapping the Throttle Body and other electrical parts with no change. Ran fine for a few miles, before the cam chain let go. Luckily the mechanic was on board at the time.

New engine is running fine, but it probably has less than 2000 mi on it at this point.

He really didn't have any cooling system issues, but when the fan would run the problems would start. More heat related than cooling system related.

Keep in eye on the cooling system. Be sure the radiator is full and the overflow is at the correct level, then check it after riding (and cooling) a couple times to make sure it's not changing. If there is any change, be sure to check the oil level to make sure that coolant isn't going into the oil.

Hopefully none of that is happening, but be sure to check.

We just replaced a head gasket on one of our cycles with 4000 mi on it. In our case, the coolant was being over-pressurized by the cylinder pressure and being pushed into the overflow bottle - which was overflowing. After it would cool the radiator would be low and the bottle would be filled to the top. There were black specs in the coolant as well (coolant had been recently replaced).

July 22nd, 2017, 01:00 PM	#8
jkv45 Rev Limiter Name: Jay Location: WI Join Date: Jul 2013 Motorcycle(s): '06 SV650n, '00 Derbi GPR, '64 CA77 Dream 305, '70 CL450 Scrambler, numerous dirt bikes Posts: A lot. MOTM - Jun '18, Oct '16	Talked to my buddy with the RC. He said they felt they solved the problem by replacing the ECU. That was after swapping the Throttle Body and other electrical parts with no change. Ran fine for a few miles, before the cam chain let go. Luckily the mechanic was on board at the time. New engine is running fine, but it probably has less than 2000 mi on it at this point. He really didn't have any cooling system issues, but when the fan would run the problems would start. More heat related than cooling system related. Keep in eye on the cooling system. Be sure the radiator is full and the overflow is at the correct level, then check it after riding (and cooling) a couple times to make sure it's not changing. If there is any change, be sure to check the oil level to make sure that coolant isn't going into the oil. Hopefully none of that is happening, but be sure to check. We just replaced a head gasket on one of our cycles with 4000 mi on it. In our case, the coolant was being over-pressurized by the cylinder pressure and being pushed into the overflow bottle - which was overflowing. After it would cool the radiator would be low and the bottle would be filled to the top. There were black specs in the coolant as well (coolant had been recently replaced).