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posted January 16, 2002 02:51 PM
Aluminum Fan.....A Must, or............. I just ordered a Yoshi system for my bike(stainless w/Ti can) and was wondering if I needed an aluminum fan or not. I've heard it both ways. Some guys have put systems on their bikes and kept the stock fan and had zero problems, and vice versa. I've heard that some people that have bought aluminum fans have had to trim them??? What's up with that? I know there will be some increase in temp., do any of you think that running some redline water wetter would be a good idea?
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posted January 16, 2002 03:17 PM
You know, with a stainless header, it prolly won't be an issue. The big problem with full Ti systems (Muzzy,Akro, etc.,) is that the header pipe gets rid of heat very quickly. Much faster than the block actually heats up. Hence, the plastic fan can get a lot of heat on it from the header system, before the motor is up to temp and kicks on the fan. Basically, if you don't have air moving over the header system (ie; at a stoplight) and the motor isn't so hot as to turn on the fan, it's getting very warm from the heat coming off the Ti pipes. A stainless system heats up less quickly, so this is less of a problem.
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82 Gpz750, 84 Ninja 900, 2000 ZX12R (Muzzy Big Bore Kit), *another* 2000 ZX12R (Muzzy custom stroke crank 1341cc motor), 2004 ZZR1200, 2005 ZX10R, 2007 ZX14, 2008 Concours 14, 2014 Versys 650, 2014 Yamaha WR450F, 2015 Ninja H2
posted January 16, 2002 03:33 PM
ZX-9R block needed I think the fan is far enough away on the zx12r.
I've done MANY dyno runs back to back to back and I've had this yosh hot even before it was wraped.
Anyway, I dont think you need one like a zx-9r does.
They need them.
I need a 2000 zx9 block... by the way.
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posted January 16, 2002 03:33 PM
thanks.... swft,
That's kinda what I was thinking, and that's what Harry said when I spoke with him about it earlier today. I just figured I see what everybody's take was on it since it is an inexpensive mod to do, and would be easy to install while I had the bike tore down and was installing the header pipe.
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posted January 16, 2002 03:48 PM
Do it anyway! I had a 1989 ZX10 with a Vance and Hines regular steel header and my fan melted in New Hampshire (a ways from home). Rigged a fan for the ride home but what a pain in the ass! Then had a 1990 ZX10 with a Muzzy stainless header and voila fan melted, but close to home. Can't say the 12 is similiar but you can bet for $35.00 when my Yosh goes on the aluminum fan goes on! Now they are easy to get but back then I had to get them from an outfit in Texas that took stock fans from the HVAC industry and drilled holes in them to match. The Muzzy fans look somehow identical to those. HMMM!
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posted January 16, 2002 03:55 PM
But what about..... What about the fans having to be trimmed???? I'd think you could easily get it out of balance if you started trimming on it. I have no problem with buying one, I just don't want to create a problem.
Hey Y2K, did you get my e-mails I sent you earlier today?
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posted January 16, 2002 04:27 PM
One issue with the aluminum fan is the way it is vacuum packed in the package. Be very careful when you remove it from the cardboard. It is easy to actually bend the fan while you are removing it from the wrap. Bending it is sometimes enough to throw the fan out of balance and cause that annoying scraping sound we have all heard about.
I personally have seen two 12's with aftermarket exhaust systems that have severely melted the stock plastic fan.
My advice is to install the fan while you are adding the Yosh..
posted January 16, 2002 04:40 PM
No need to do any trimming on the fan, but there is a gasket that comes with it that needs to be trimmed. I've got the same setup as you - red '00 12R with the Yosh RS-3 Duplex Race exhaust. I ran the Yosh pipe for a few months prior to buying the Muzzy's fan blade. My stock plastic fan looks just fine. Matter of fact, I like the stock fan blade better - it doesn't make any rattling noises when it is turning like the Muzzy's does.
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posted January 16, 2002 04:53 PM
Thanks for the help guys, this place ROCKS!!!! I appreciate all of your comments fellas.
RocketRacer,
Do you think you shoulda left the stock fan on??? Did you do any city riding during hot weather, in stop and go traffic with the stock fan on????
Once again, if I need it will buy it. But if I don't, then I'll keep the loot in my pocket.
NOTE: I live in Tennessee and our summer weather is notoriously HOT and VERY HUMID.
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posted January 16, 2002 05:14 PM
I bought the fan just as a precaution and because I was nervous about the plastic one melting and/or deforming. Was on the phone with Muzzy's ordering a clutch kit and figured I might as well have them send me fan blade at the same time. Save a little on shipping, ya know?
Anyway... I don't see any need for the aluminum blade on mine. Next time I have the radiator off for any servicing I may just put the plastic one back on. I RARELY ride in any slow traffic. It's very uncommon for me to even be a stoplight on my bike. I live on the outskirts of town and I'm pretty much on "the open road" just as soon as I leave the house. But - I HAVE ridden in slow, stop and go city traffic during the summer and had the fan cycling quite a bit on a couple of occasions. That was with the Yosh exhaust system and the stock plastic fan blade. The blade survived just fine!
The Muzzy's fan just annoys me with its rattling noise when the fan does kick in. [And no - I didn't damage the fan blade taking it out of the packaging!] Been a lot of guys over the last umpteen months complain about the rattly Muzzy's fan and I have yet to see anyone say for sure why it does it!
posted January 16, 2002 05:47 PM
It's kind of funny - when others first starting bitching about their Muzzy's fans making "rattly noises" I was like "WTF?? Mine doesn't do that!" But I'd only been listening to it after shutting the engine off. I'd come home from a ride and let the engine idle for a minute or so in my driveway before shutting it off. My fan would come on and it sounded just fine --- with the engine not running. First time I got caught in traffic at a light and had my fan come on I heard the fan making the rattly noise. I listen for it now, and sure enough it always makes a rattly noise when the engine is running - but is quiet as can be with the engine shut off.
Hey, I'm not crazy!! There are others out there that will tell you the same thing!
posted January 16, 2002 07:16 PM
Put the Muzzys fan on, I live in a hot area too and the $35 makes it a no brainer, it's worth it to not have to worry about it. Mine is quiet, and I'm not deaf.
posted January 16, 2002 07:45 PM
I've looked at this installation again and again and I really can't figure out what could be rattleing or scraping. Have any of you actually been able to see what's hitting? If so, let me know and we'll fix it.
Here is the reason for the fan--Your stock fan won't usually melt if it is turning. The problem arises when the exhaust (ANY single wall tube aftermarket exhaust) starts to throw heat before the fan kicks on (as during a high idle "warm up", especially on carbureted bikes)or fails to turn (fuse, etc.) Or if the fan "almost" melts once or twice it will sag and hang up before fully melting. It's an inexpensive part that solves a potential problem. An added feature is that it moves more air than the stocker. (Since your're going to ask, it's because of the wider blade chord.)
Doug
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posted January 16, 2002 08:57 PM
I live in a hot area and have melted stock fan blades on other Kawasakis. I put alum fan on when I installed the header since it's a good time to do it. I had to trim my blades but can't remember what they were near.
posted January 16, 2002 08:58 PM
Edited By: 22348bCVC on 16 Jan 2002 21:00
Hey sportbike ...I surgically and carefully removed it from the tight shrink wrap, checked for blade deformations (none), trimmed the gasket per instructions, installed the fan per instructions with the radiator out of the bike, checked and rechecked and hand spun it for clearance (snag/rub free)...no blade trimming...and it still sounds LOUD when it kicks in, not like a rattle as if something's loose, but more like a LOUD noise as if a blade or something if creating a major disturbance as it whips the air around down there...make sense?...this is with a full MUZZY installed!...and I'm definitely not deaf....I was told by my fellow 12R riders who ride bone stock bikes that it sounds "cheap" or "agricultural"....hmmmm......
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posted January 17, 2002 04:04 AM
Ninjaman the Yosh was a straightforward installation, do yourself a favor and remove the radiator 1st though. Don't worry about the stock fan with the stainless headers and it's a perfect fit so there is plenty of room.
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posted January 17, 2002 04:36 AM
Yeah..... Yeah Otis, I will definitely drop the radiator. When I pulled my stock headpipes off to install the dogbones I didn't drop the radiator and it was sort of tight. But I had to straighten some fins on my radiator afterwards. With the radiator off it should be gravy, still on the fence about the fan though. I'm saying no one minute, and WTF the next. ____________
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posted January 17, 2002 05:58 AM
Like Otis, I put the Yosh on mid last summer and have had absoulty no deforming of the stock fan. I have looked at the edges several times and they are as sharp as ever. I sure agree about dropping the radiator--makes installation a lot easier and you do not have to worry about smacking the fins with a wrench.
I have it in my bike and I think it makes a difference. The info about the coolant percentages is interesting. In real life having the right mixture seems to make a difference in how fast and how ofter the needle goes to the top.
The fan noise comments still baffle me. If you put a fan on your bike that blows harder wouldn't you expect to hear more AIR noise ? I have no rattles or other mechanical noises but I do hear air blowing when it runs and that's what I would expect to hear.
posted January 17, 2002 07:22 AM
Oh, and you need to pay attention to get the air out of your system when you pull the radiator and drain everything. It seems to need to be burped to get all the air pockets out.
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posted January 17, 2002 07:25 AM
I've run Water Wetter since I got the bike, ran it in my ZX-11 for years too.
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posted January 16, 2002 02:51 PM
posted January 16, 2002 03:17 PM
posted January 16, 2002 03:48 PM
posted January 16, 2002 04:27 PM
posted January 16, 2002 07:16 PM
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With the radiator off it should be gravy, still on the fence about the fan though. I'm saying no one minute, and WTF the next. 
