Engine heat rising rapidly FIXED

WD Forte · World Chat Champion Joined: 17 Jun 2010 Karma :

Well I had a quick gurgle and from what I see it has a temp sensor
mounted on the thermostat and I saw no independent fan switch.
If so, I reckon it uses circuitry after the sensor which displays coolant temp and controls a fan relay.

First thing I'd is check the coolant
If you have a leak and lost coolant then duh!

If the coolant is all present and correct then test the cooling system electricules.
I'd use my meter and IR temp gun to see of the gauge is lying or not and fan cut in at the specified temp.
If the displayed temp is close to the IR gun and the fan cuts in as close as, then maybe its all as per spec

Next, out comes the toolbox and the methods listed above
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Matt B · World Chat Champion Joined: 01 May 2012 Karma :

Howling Terror · Super Spammer Joined: 05 Dec 2008 Karma :

Thank fuck you're back Matt B. Thumbs Up

Since your BCF sabbatical I told a bloke to add an egg white to a leaking rad....in a car so no biggie.
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Matt B · World Chat Champion Joined: 01 May 2012 Karma :

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Matt B · World Chat Champion Joined: 01 May 2012 Karma :

P. · Red Rocket Joined: 14 Feb 2008 Karma :

But you sound like a bellend.

redeem ouzzer · World Chat Champion Joined: 06 Oct 2015 Karma :

Tawny, thanks for giving me some entertainment. Now pipe down and let those without a mental disorder help the nice man fix his bike.
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Stoker · Nitrous Nuisance Joined: 13 Sep 2014 Karma :

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Edit typo/grammar

Stoker · Nitrous Nuisance Joined: 13 Sep 2014 Karma :

Religion is based on faith, engineering is based on physics, which, the last time i looked, is based on sound and provable facts.

Robby · Dirty Old Man Joined: 16 May 2002 Karma :

Tawny, in another thread you were sperging about how we shouldn't be giving information away for free in case someone you don't like might benefit from it.
Is this your plan to fix the problem? Poison the advice threads with random guesses and misinformation to make it useless?

The general rule of the workshop is that you only offer advice if you know what you're talking about. If you want to learn, fine, read it. Offer a suggestion after making it clear you don't know anything, but do not offer a guess based on a total lack of knowledge or experience. That sort of advice is what leads to people replacing their ignition coils and CDI when the plugs are worn out.

OP - basic cooling things first. Is there any coolant in the engine?

Rogerborg · nimbA Joined: 26 Oct 2010 Karma :

Paris2 · Nearly there... Joined: 10 Apr 2011 Karma :

Paris2 · Nearly there... Joined: 10 Apr 2011 Karma :

P. · Red Rocket Joined: 14 Feb 2008 Karma :

Blocked rad is easy, put water in top, does it flow freely through the rad and come out?

Paris2 · Nearly there... Joined: 10 Apr 2011 Karma :

OK, now that should be easy to check Very Happy

What about pump? Guess that would require refilling system and checking to see if it is being pushed around somehow?
I've read somewhere about pressure testing, is that something done simply?
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almostthere · Traffic Copper Joined: 28 Oct 2013 Karma :

change the radiator cap
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MCN · Super Spammer Joined: 22 Jul 2015 Karma :

To check the pump circulation.

Open a plug on the water jacket or crack a hose clip open and push a small screwdriver in under the hose until you can let the coolant dribble out. When you get a steady dribble, start the engine and see if the dribble becomes a spurt or stops. That indicates pump flow.
If the radiator also has a radiator cap, you can also let the engine heat up to thermostat opening temperature with the cap off and watch the coolant flow into the top of the radiator and down the tubes.
Maybe, but sometime you cannot see much inside due to the layout of the bike frame etc.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.

almostthere · Traffic Copper Joined: 28 Oct 2013 Karma :

change the fucking radiator cap!
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Paris2 · Nearly there... Joined: 10 Apr 2011 Karma :

What does changing the radiator cap achieve?

Also, whilst it appears my thermostat works, is there any pros/cons as to riding without one altogether?
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cb1rocket · World Chat Champion Joined: 30 Jan 2010 Karma :

If the radiator cap is defective, it will cause the system to over pressurize. Won't let coolant flow to the expansion bottle and probably won't allow the coolant to return to the cooling system when cooling down - leading to loss of coolant but an overfilled expansion bottle instead.

It's cheap enough to replace.

Leaving the thermostat may help it run cooler. See if it does. If it continues to overheat then you most likely have a headgasket issue.

If it does indeed run cooler then it may be possible to buy a lower temp stat that opens sooner, say 80'C instead of 87'C. It should be stamped with what the opening temp is on the stat.

Edit:
However all the other advice is handy to check too. Check the rad for blockages, check the pump, check the sensor even too?
When does the fan start to kick in?
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Paris2 · Nearly there... Joined: 10 Apr 2011 Karma :

Fan kicks in at 104.

Should I be seeing coolant in the expansion bottle at all times? It's generally between the min-max.
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MCN · Super Spammer Joined: 22 Jul 2015 Karma :

It should stay between Min Max.
The expansion tank allows coolant under pressure to escape via the pressure cap as the engine warms (coolant expands). It goes back into the cooling system when the engine cools.
It should never really need anything apart from a look from on fill to the next fill years later.

But... how are you measuring the temperature?

Your problem may be the temp gauge on the bike (if it has one.) indicating a hot engine when it is not hot. Maybe the gauge is not reading correctly.

If you are using a reliable thermometer then 104 is 'possibly' a bit late.
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Disclaimer: The comments above may be predicted text and not necessarily the opinion of MCN.