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1979, Honda CX500C
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Discussion Starter · #1 ·
Hi CX’ers

Recently I heard a mechanical CX fan can be replaced with a ZX6R fan (like everyone on this forum knows) but without having to chop the end of the cam.
If anyone has posted on this and I’ve missed it then I apologise but if not and anybody has any info on how to achieve this it’d be hugely appreciated by this fairly recent ‘79 CX500 owner.
Cheers
 

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It a matter of positioning the electric fan on the back of the radiator so it doesnt foul the protruding cam snout. There are more than a few fans that fit , measure the space then go looking for a fan
 

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i bought a 1995 Kawasaki Ninja fan expecting to do the same thing—but requires cutting off the end of the can, so i just bought an original fan instead. I dont have overheating issues, so no need to go 'lectic i think.
 

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i bought a 1995 Kawasaki Ninja fan expecting to do the same thing—but requires cutting off the end of the cam, so i just bought an original fan instead. I don't have overheating issues, so no need to go 'lectic i think.
That is good to know for sure, but where are you located and what kind of riding do you do? The reason i ask is i was all gung-ho about the e-fan conversion due to stories of grenading fans (even brand new ones) but am now hearing stories like yours. I don't like the idea of hacking off the end of the camshaft, it's irreparable, but don't like the idea of fan shrapnel destroying the rad either.
 

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I agree with Phreak, you have a problem other than your fan. How is the condition of your radiator? My Silverwing never got that hot when in the desert in New Mexico at 100 degrees plus.
 

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I agree with Phreak, you have a problem other than your fan. How is the condition of your radiator? My Silverwing never got that hot when in the desert in New Mexico at 100 degrees plus.
Think there is some variation in guages or 7v regulators. Mine runs close to what is in photo. Never had an issue? Any higher than this and I would be concerned
 

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Think there is some variation in guages or 7v regulators. Mine runs close to what is in photo. Never had an issue? Any higher than this and I would be concerned
There very well could be variations in gauges unless his temperature reading is consistently cooler when cruising at speed. A little stop and go and then getting up to 35mph with temps in the 70’s I wouldn’t expect to see high temps that cruising at 50mph. Anyone else have high temp readings? Just curious now.
 

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35 MPH is pretty close to our suburban 60 KMH {37.8 MPH}.

75 F is a pleasant day. ALL of my bikes sit on the thin/thick junction.

The reading shown on cause gauge is what I'd expect to see at 60 KMH on a 110 F + day IF I can keep moving, otherwise it creeps up some.

An unrelated issue with many thermo fan installations which has no bearing on the high reading shown here is that many 'cycle'. The temp goes up and down as the 85C thermo switch brings the fan on. The hysteresis of the switch drags the temp down by up to 7C before switching the fan off. At 78C the thermostat is beginning to close. Basically an endless pi$$ing match.
 

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1978 CX500 "The Grub", 1983 GL650I "Nimbus"
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I was dogged for a season by a slightly high operating temp a couple years ago. It ended up being a very small head gasket leak. It can't hurt to perform a pressure check on each cylinder. Set to TDC compression, pressurize the cylinder, and watch for bubbles in the reservoir.
 
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