Carb still shooting gas and bogging, what the hell is wrong?

[DonTZ125]

The thermostat cracks at 80-84C, and is fully open at 96C. The fan kicks on at 105C, then shuts back off at 98C. The gauge isn't marked, so saying "the fan kicks in late" is a bit off. It's there to keep the engine from overheating in slow traffic, and it does its job well. If the fan ISN'T pulling the temperature back down, it's time for basic cooling system troubleshooting and maintenance.

If you jump the fan switch terminals, the power is still cut off with the key, so no worries about running the battery down. Unless of course you leave the key on, in which case it's "Something stupid, no sympathy!"

[Evilchicken0]

The engine itself doesn't overheat so it should be fine. All the Yamahas I've had do this the coolant seems to get impossibly hot until the thermostat opens. As you're in the states you could have a look for a Muzzy fan, they're alloy and the blades are bigger shifting more air, I've got one on my Bimota.

[snydes]

The engine itself doesn't overheat so it should be fine. All the Yamahas I've had do this the coolant seems to get impossibly hot until the thermostat opens. As you're in the states you could have a look for a Muzzy fan, they're alloy and the blades are bigger shifting more air, I've got one on my Bimota.

Canada* but I'll take a look for aftermarket fans that are better, thank you I never thought of that good idea.

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[snydes]

The engine itself doesn't overheat so it should be fine. All the Yamahas I've had do this the coolant seems to get impossibly hot until the thermostat opens. As you're in the states you could have a look for a Muzzy fan, they're alloy and the blades are bigger shifting more air, I've got one on my Bimota.

is there a way to know which fan blade will fit the FZR's fan?

i can get blades from here but i dont see any FZR400 model names so im not sure if any other yamaha ones fit - http://www.powersportsnetwork.com/enthu ... egoryCode=


UPDATE: just found this: https://www.jcmotors.com/muzzys-aluminu ... 00-22184-p

not sure if it will fit 400 as well

[TomcatMJ]

Another often overseen reason for overheating is too few coolant in the reservoir-tank or a blocked hose from the reservoir-tank to the radiator-cap...did you check theese two things before looking for other error-sources?

[snydes]

Another often overseen reason for overheating is too few coolant in the reservoir-tank or a blocked hose from the reservoir-tank to the radiator-cap...did you check theese two things before looking for other error-sources?

I checked and it was about 5cm down from the top of the fill up cap so it should have been fine, i will most likely end up getting the Muzzy Cooling fan but only if someone can confirm it will fit my 400 fan motor. Meaning that blades will fit casing (not to long), and if holes dont line up I can always make an adapter piece.

[https://www.jcmotors.com/muzzys-aluminu ... 184-p#tab1]

[DonTZ125]

Pop the rad cap off, see what the level is. A wonky cap can blow coolant out to the reservoir, but not let it back in.

[snydes]

Level is good just checked

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[DonTZ125]

Quick simple question, is there any way to adjust when the cooling fan comes on? This bike gets extremely hot quick and the fan only turns on about 3mm-5mm from the red line of temperature.

I was bored last night, so I decided to look at this. I have in fact come up with a circuit that will plug into the temp sender and jumper out the stock thermo switch. An adjusting pot in the circuit box will allow you to turn on the fan between 80-120C - way too hot to way too cool, but that's up to you to determine. I realised at lunch time I need to tweak the circuit to include some deadband (the stock switch comes on at 105, shuts off at 98 - 7 degrees of deadband) to prevent rapid cycling on/off, but that shouldn't be too hard.

Everything will be plug'n'play, with mating connectors. I'm thinking price would be ~US$40. Is this something folks might be interested in?

[snydes]

Quick simple question, is there any way to adjust when the cooling fan comes on? This bike gets extremely hot quick and the fan only turns on about 3mm-5mm from the red line of temperature.

I was bored last night, so I decided to look at this. I have in fact come up with a circuit that will plug into the temp sender and jumper out the stock thermo switch. An adjusting pot in the circuit box will allow you to turn on the fan between 80-120C - way too hot to way too cool, but that's up to you to determine. I realised at lunch time I need to tweak the circuit to include some deadband (the stock switch comes on at 105, shuts off at 98 - 7 degrees of deadband) to prevent rapid cycling on/off, but that shouldn't be too hard.

Everything will be plug'n'play, with mating connectors. I'm thinking price would be ~US$40. Is this something folks might be interested in?

At the moment I don't feel like doing a lot to the bike as I just got it fully working but maybe eventually i might, but that's also if I don't get the fan i mentioned above because if it cools faster that's perfect

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[Evilchicken0]

I don't know the fan size for the FZR 1000 ... you could maybe find a standard one on ebay and ask the seller for the overall diameter ??? The aluminium is pretty bendy so redrilling holes wouldn't be difficult.