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Repair guides and support for motorcycles manufactured by Suzuki Motor Corporation.

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Engine overheating after service

I recently serviced my 2005 sv650 including changing the 2 oil cooler pipes (as corroded and weeping) a now the bikes temp is getting higher than before. I would go to max of 84c now rises and shows no sign of dropping and fan doesn't kick in ,I have checked fuses and all seems good any help appreciated

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Hi @arob2305

Here’s a link to the service manual for the bike. (I think)

Click on Section 6 Cooling and Lubrication …tem.pdf. This details the Cooling section. It shows how to test the cooling section, which includes the cooling fan and the cooling fan thermo switch.

Presumably the thermostat is opening to allow the coolant to flow through the engine and that there are no air locks in the cooling section after the repair.

Don’t know if motorbikes are the same but with car engines if you start a cold engine with the radiator cap removed and then let it warm up when the thermostat opens you will see coolant begin to “flow” or “swirl” in the neck of the radiator. If it does this means that the thermostat has opened because its’ operating temperature is reached. Quickly switch off the engine because the coolant expands when hot and will overflow out of the radiator.

You can view the manual online but you have to sign in to download it.

Hopefully a start.

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Hi jayeff I should have been more clear by service I meant i only changed the oil and filter and haven't touched the coolant at all . Bike was fine till I changed the oil and filter could it be the oil as some people have suggested?

@arob2305

I thought that perhaps you performed "major surgery" as you said "... including changing the 2 oil cooler pipes (as corroded and weeping)..." and thought therefore the coolant would have been drained from the system. Did it run OK after this then or was it hot from then on?

Did you check for air locks in the coolant system?

I don't know bikes but with cars the temp sensor is usually related to the coolant but if the engine was getting hot due to an oil problem I would have thought that there would be an oil pressure warning light assuming that there is one.

Have you checked the coolant levels? Have you checked the connections to the fan thermo switch as shown in the manual in case it was disconnected somehow?

Checked coolant and it is all good will check the switch and go from there thanks

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