250-500cc WR300 Cooling Fan

Does anyone installed a cooling fan on a WR300. Which model can fit?

Thanks

I haven't, but if I encounter heat problems in the summer I probably will think about it. I've done a bit of researching for my previous Yamaha WR480 and liked most the SPAL VA32-A101-62S It's 4" (96mm) and 124,0 CFM:


http://www.spalautomotive.com/files/assiali/catalogues/VA32-A101-62S.pdf

As the WR does have pretty much of space behind the radiator I think it will be easy to install...
One problem is that that FAN needs 12VDC, that could be solved with an rectifier and an capacitor, I've done the same with my WR480 without any problems (done so to not drain the batter y and use the power from the light's alternator instead)
To control the function of the FAN you I prefer a simple switch that I turn ON in the really tight stuff or fit a thermostatic switch somewhere in the cooling system (more complex..)

Regards.

If you can find a mosfet rectifier from a 2010 or later Honda cbr600rr you would have a very good stable 12 volt output that wouldn't produce too much excess heat. I did a detailed writeup over on DRRiders.com detailing the benefits.

An overflow bottle works better and doesn't need power

I thinking instal a cooling fan but I am a little afraid to overcharg the delicate Dugati ignition. I removed the head light in this regard and felt the diference.

How a overflow bottle can keep the engine cooler?
Please give me more details.
Thanks

An overflow bottle will allow the engine to puke and siphon in additional coolant as needed. That way after you overheat, it can pull it back in instead of being low on the coolant.

Using a fancy pants coolant like that stuff ZipTy sells would probably be a quicker, easier, cheaper solution.

I thought about a fan at one time for tight, gnarly technical trails, but I can't recall overheating in the 150+ hrs I've got on it. And I only run the regular auto pre-diluted prestone in my bikes. So, I think I'd go passive cooling with maybe silicon hoses, fancy coolant, and an overflow tank. That would make a pretty solid setup for slow mountain crawling IMHO.

I was regularly boiling the coolant (waterwetter) in hot weather up steep slow hills. I fitted an overflow bottle (off a ZZR400) and have never had a problem since. There's a heap of space behind the rads on a 300 to put one, but you don't need much capacity for it to work fine, mine's probably overkill, but I thought the aftermarket one's looked a bit smallish.

My 09 300 has grip heaters, blinkers, taillight , trailtech h2 light and trailtech explorer always tapped in all the time. Never an issue in 3 years

Thanks for the info, Cheap and easy, will try it first.
Also I will remove the thermostat, I think that it's not a bad thing

For the moment, I have some time for work on this. -19°C this morning

They didn't switch to the Ducati ignition until 2011. What you have is a much better ignition with a much better track record.