Cfmoto vnight coolant change advice

[Engineern6719]

I have just gone through the process of flushing and replacing the engine coolant.It was a very difficult job bleeding the system of air but eventually got there.The service manual for the engine doesn't mention the method used to replace the coolant.However when I examined the diagram of the water pump there are three bolts (items 6)for disassembling the pump plus an extra bolt at the top of the pump that is not mentioned in the service manual.
Would somebody know if this extra bolt in the case of the pump is a bleed screw for the coolant?

[SpudRider]

The bleed bolt will usually have a copper washer beneath the bolt.

[Engineern6719]

Originally Posted by SpudRider

The bleed bolt will usually have a copper washer beneath the bolt.

Thanks mate I shall check.

[Engineern6719]

Originally Posted by SpudRider

The bleed bolt will usually have a copper washer beneath the bolt.

Checked the "bleed bolt" and it's washer is either steel or aluminium.The bolt is quite hard to reach behind the frame of the bike so will have to find another way to bleed the system.Anybody have any suggestions.

[SpudRider]

You can remove the water pump cover. How did you drain the coolant this time?

[Engineern6719]

Originally Posted by SpudRider

You can remove the water pump cover. How did you drain the coolant this time?

I disconnected the bottom radiator hose to drain the system and flushed the system with demineralised water.After reconnecting the bottom hose the system was then refilled.The problem I had then was removing the trapped air.it took a couple short runs on the bike and topping up between runs to clear the air from the system.There has to be a better way of doing it than this to remove the air.

[SpudRider]

If you remove the water pump cover you will drain the coolant at its lowest level. This is less convenient, but equivalent to draining the coolant from the drain bolt.

[Engineern6719]

Originally Posted by SpudRider

If you remove the water pump cover you will drain the coolant at its lowest level. This is less convenient, but equivalent to draining the coolant from the drain bolt.

Thanks Spudrider.Removing the pump cover would be quite a drama as the main frame of the bike covers the top of the pump.The way the system is set up the pump is not the lowest point,the bottom radiator hose is.The problem that concerns me more is when you come to refill it and removing the trapped air in the head.I am going to monitor the coolant level and engine temps over the next few days to ensure there are no changes and all the air is out of the system.

[SpudRider]

The water pump cover is the lowest point in the cooling system for all my dirt/adventure motorcycles. Therefore, I was unaware of the different design for your street bike.

I think you are following the best procedure to eliminate any air voids in the cooling system. If necessary, keep adding coolant until the radiators won't accept any more.

[Engineern6719]

Originally Posted by SpudRider

The water pump cover is the lowest point in the cooling system for all my dirt/adventure motorcycles. Therefore, I was unaware of the different design for your street bike.

I think you are following the best procedure to eliminate any air voids in the cooling system. If necessary, keep adding coolant until the radiators won't accept any more.

My other bike,a Kawasaki road bike,the water pump is at the lowest point.So I don't think there is any hard and fast rule.The only thing that concerns me is overheating the engine trying to clear the air from the system as I don't know whether the temperature gauge is giving a true value for engine temperature
I have been rechecking coolant level.The first check I added 65mls.Subsequent checks were about 5mls.

[SpudRider]

I think you are doing everything you can to eliminate air voids in the cooling system. Keep checking the coolant level in the radiator, and keep adding coolant, as necessary.

[Engineern6719]

Originally Posted by SpudRider

I think you are doing everything you can to eliminate air voids in the cooling system. Keep checking the coolant level in the radiator, and keep adding coolant, as necessary.

Thanks mate for your help and support.