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+--- Thread: Fan not cutting in? (/showthread.php?tid=61503)
Fan not cutting in? - reillypadraig - 15-01-13
Leaving the bike running for a good while, fan is working, tried it, power at the thermostat. But still won't cut in
Silly question, what is the direction of flow from the carbs back to the thermo?
From the tps side to the thermo or the tps side back to the rad?
Bike wasn't put together when I got it so was guesswork.....
Re: Fan not cutting in? - Bracechenko - 15-01-13
I've had 2 x FZS600's and have never had the fan cut in. The engine fins help a huge amount with cooling along with the fact that there is good space/air channels in and around the engine.
Same as you, I thought that my fan was broken and left it idling on a hot day for 10 mins but nothing. The temp light doesn't come on though so I wasn't overly concerned.
After having 2 of them now and both the same, I realise that the fan is probably more for our melting neighbours on the continent in sunny Spain and the like - British weather isn't enough.
Now, my FZ1 on the other hand....... :rolleyes
Re: Fan not cutting in? - darrsi - 15-01-13
My fan cuts in okay if i let the bike idle in warm weather!
Re: Fan not cutting in? - reillypadraig - 15-01-13
Lol, good to hear in a way, but if the flow of the coolant is wrong is probably wont come on anyway??
I surprise I was running it in temps only around 5 degrees haha.
So what way is the pipes surposed to be placed,?
Re: Fan not cutting in? - His Dudeness - 15-01-13
my fan only came on once. but try rotating the fan by hand to make sure it's not hitting the cover that's around it. that bends in easily. if it rotates freely then you can test the fan by crossing the fan's block connector with a piece of wire. it should come on
Re: Fan not cutting in? - His Dudeness - 15-01-13
(15-01-13, 01:55 PM)reillypadraig link Wrote: Lol, good to hear in a way, but if the flow of the coolant is wrong is probably wont come on anyway??
I surprise I was running it in temps only around 5 degrees haha.
So what way is the pipes surposed to be placed,?
what pipes are you talking about?
Re: Fan not cutting in? - reillypadraig - 15-01-13
I crossed the wires, working perfect. The pipe from the rad to the carb and then the other 1 from the carb back to the thermostat housing, just it's the coolant piping that runs tru the carbs that stops the butterfly valves from freezing shut in desperately cold weather. I don think which way they go that matters , it just changes te direction of the flow through the carbs.
Reason I'm asking is because when I got the bike I only got one hose to go fro the carbs to the thermo housing, and had to make up a 2nd hose to go from the rad, trouble is not sure which pipe on the carbs I was surprised to put the pipe from the thermo on cause it reaches both and Haynes manuel doesn't show which goes where?
Re: Fan not cutting in? - His Dudeness - 15-01-13
the pipe on the left side of the carb as you sit on the bike goes to the thermostat and the right side of the carb goes to the rad
Re: Fan not cutting in? - reillypadraig - 15-01-13
(15-01-13, 02:43 PM)His Dudeness link Wrote: the pipe on the left side of the carb as you sit on the bike goes to the thermostat and the right side of the carb goes to the rad
Thanks for that, thinking it was the wrong way around lol
Re: Fan not cutting in? - Motorbreath - 15-01-13
(15-01-13, 01:25 PM)Bracechenko link Wrote: I've had 2 x FZS600's and have never had the fan cut in. The engine fins help a huge amount with cooling along with the fact that there is good space/air channels in and around the engine.
Same as you, I thought that my fan was broken and left it idling on a hot day for 10 mins but nothing. The temp light doesn't come on though so I wasn't overly concerned.
After having 2 of them now and both the same, I realise that the fan is probably more for our melting neighbours on the continent in sunny Spain and the like - British weather isn't enough.
Now, my FZ1 on the other hand....... :rolleyes
I agree, even in Spain it barely needs the fan.
Overhere FZ6s and FZ1s seem like all them were malfunctioning on summer, pure fan sound at the town. :lol
Re: Fan not cutting in? - darrsi - 15-01-13
Does this help?
http://www.yamahamotorcyclespares.co.uk/spares/epc2.asp?modelID=9655&PageiD=6&m=YAMAHA+FZS600+Fazer+WATERPUMP&uID=0
Re: Fan not cutting in? - packie - 15-01-13
Jaysus Padriag...you're having loads of fun!! For an extra five or six hundred bucks you probably would have been better off and bought one running well. There was one or two of them floating around Dublin on Done Deal for about €1,300. You would have knocked a ton or two off that price on haggling.
Those parts went off today by courier, dude. Forgot to bring them with me to work yesterday. They should hit you before lunch tomorrow.
Re: Fan not cutting in? - Fazerider - 15-01-13
For what it's worth, carburettor icing requires humidity to take place so in very cold conditions it's unlikely happen as the air is too dry.
I've found that between 2ºC and 6ºC is ideal to trigger icing on a Fazer with blocked carb heater pipes, the jets themselves ice up as the evaporating fuel cools the damp incoming air to below freezing. The bike gets gutless a couple of miles after starting off and then dies, about two minutes later you thumb the starter and it's like nothing was ever wrong as the warmth from the engine has now reached the carbs and it stays fine for the rest of the journey. Quite puzzling the first time you come across it!
It lead to some scary moments on my old Honda 125. Rather than having a butterfly valve the throttle cable on that simply pulled the carburettor slide and needle up against a fairly weak return spring. When you got icing conditions the tapered needle would jam progressively higher each time the control was moved until the engine was running nearly flat out. I'd kill the engine and then, finding nothing obvious wrong, try to kickstart the bastard thing back into life. Once I'd worked up a good sweat in my bulky oversuit the residual engine warmth would reach the carb and it would run perfectly normally. Thought I was going mad until my dad told me about carb icing. :lol
Re: Fan not cutting in? - darrsi - 15-01-13
Oh, that's what you're talking about, the carb heater circuit.
I wasn't sure to be honest :rolleyes
We've been down this road before.
If your pipes are clear and you still suffer from carb icing, give your bike booze! :thumbup
From a post earlier in the year:
"....SOLUTION: Buy 5 litres of 99% pure alcohol off Ebay, for about £20 delivered, and put 200ml in every full tank of fuel.Carb. icing only happens between 0 an 5 degrees temperature by the way, not normally below or above those temperatures!The alcohol lowers the freezing point of any moisture, and also binds with water in the tank then burns it off.My bike has never suffered from it since, and the alcohol burns quite happily with petrol with no side effects whatsover, other than the good one! Make sure it's 99% though and not the 70% one, as the other 30% is water, and you obviously don't want to be sticking water in the tank...."
Re: Fan not cutting in? - john 087 - 15-01-13
I have my a 98 fazer for 3 years nows used in all weathers ive never heard the fan cutting in. Even when we have had an odd hot summers day in the rainy land.
Re: Fan not cutting in? - unfazed - 15-01-13
In 9 years with my fazer I've heard the fan cut in 3 times, once when balancing the carbs, once on a very hot day in rainy land about 5 years ago :lol when I stopped talking to one of my neighbours and in Plymouth in July 2011 waiting for the Ferry to spain and temp was 29C. Never came on in Spain or South of France.
I had a problem with blocked carb heater pipes and Icing years ago, but since I cleard the blockage, I never had the problem since. One sure way of preventing icing is to leave it warm up for a 3 or 4 minutes before taking off on frosty mornings
Re: Fan not cutting in? - red98 - 15-01-13
mine cuts in on a hot summers day in traffic or if i leave it running in the garage at this time of year
Re: Fan not cutting in? - darrsi - 16-01-13
That's interesting how some cut in and others don't.
I go 3 days with rad flush circulating the system when i give it a clean, so i know my system is all good and clean, and it's all airtight.
As far as i'm concerned the fan cuts in when it should, in fact my bike before the Fazer used to switch on all the time in comparison!
Re: Fan not cutting in? - His Dudeness - 16-01-13
seems like the cooling system on the fazer is very efficient. i'd say if the fan is coming on more than once in a blue moon and you have good coolant in it then you might want to check if the fins of your radiator are blocked with crap from the front tyre
Re: Fan not cutting in? - darrsi - 16-01-13
I'm quite happy with the way it is, it goes on when sitting still ticking over, there is no issue.
I used to clean the fins regularly, but got a grill on there now.
Mind you, it depends what end can you have on as well.
Just 'cos you haven't heard it come on, doesn't necessarily mean that it hasn't?
They're not really noisy at all.