So these radiator fans are crap.

[The Mighty Gryphon]

If you really want to keep your machine original and decide to use the Latvian fan, be very careful when you are pressing the fan blades onto the shaft.  One of the problems seen with the OEM fan is that the blades slide on the shaft moving forward enough to damage the radiator causing coolant leaks.

From personal experience and as noted copiously in this thread and in other threads and forums the OEM fan is a piece of sh!t with seizing bearings, melting brush holders, and blades slipping.  It doesn't make sense to me to stick with that design when the superior Spal fan is so cheap and easy to replace it with.

[noppo]

..........When i ride it more and if i notice anything goofy, i will report back.

It's been 1 year since my last post about the Spal fan mod.  i'm just reporting back that there have been no issues at all. Still going strong.
 :2thumbup:

[jjconeill]

so just fixed my k75 87 bad ground now its overheating, has enough fluid fan seems to run than seems to cut in and out overheating light comes on and off with how fast or how high the rpm is. so sensor relay fan what else could it be? only 65f here in Chicago area, will be a problem when it's 80f

[The Mighty Gryphon]

Can you start a thread in the workshop section.  It will make it easier to follow, and won't clog up this older thread.

What is the history of the bike? How many miles?  What is the general condition?  Has it been neglected by a previous owner?   How long have you had it?  Has the cooling system been flushed?  Is it actually overheating, or is the sensor confused?  Is it a coffee racer?

You shouldn't need the fan this time of year.  My first guess is that you may have a spot in the temperature sensor wiring where the insulation has worn through and the wire is shorting to the frame.  A short to ground looks like a very high temperature and can turn on the fan.  That it is intermittent  makes me think of something rubbing and bouncing around. 

It is also possible that your water pump is bad and not circulating consistently.  I think this was a problem on earlier pumps, but I have no experience there.

Anyway, please post a new thread.

[Laitch]

what else could it be?

It could be you don't have as much coolant as you may believe. How did you check it? How old is the coolant. The radiator cap might be losing pressure. The thermostat might not be opening. Those are worth a check.

[enb54]

I have scanned and attached a .pdf of the bracket I made up.

Thanks very much for the pdf, I finally have a good use for it...

[jjconeill]

well thanks for all of the suggestions about my over heating. I tested the thermostat and it was good, very twisted gasket on the radiator cap, measured the fluid that I took out and it seemed to be at least only seventy percent full I can't test the overheating until I fix this yet another problem with a thirty year old bike 87 k75,  but my battery lost it's charge, took  it back to batteries plus they charged it over night and it was fine, BUT when I connected the battery terminals, with the ignition off the starter turned on and would just keep running, have no idea what to do, put in new starter relay but it was a bad ground cable from the battery to the motor wow, I have no ideas here, HELP

[Martin]

Pull the starter relay and pop off the cover, you will find that the points have welded themselves together. Separate the points and file or sand them flat and reassemble. Bricks are known to have this problem which occurs  when you have low battery voltage. In extreme cases the battery can actually blow out. You can install an isolator switch, installation is posted or sometimes rapping on the relay will free up the points.
Regards Martin.

[jjconeill]

thanks Martin, I met a guy named Martin at work he was limping so I asked him if his foot was ok, he lifted up his pants leg and he had no foot. will try the relay and get back to you

[Martin]

Wasn't me I've got two feet last time I looked. Keep us posted.
Regards a two footed Martin.

[jjconeill]

Up date, thanks for the information about the brand new 120usd relay, checked continuity and it was on, taped on it and lost continuity, it fixed the problem. I was going to take a ride to watch some girls softball but it's a bit chilly north of Chicago today, will ride over the weekend it's going to be nice, will see if she overheats. Thanks again for all the help, will chime in later about the overheating fix.

[jjconeill]

So with my relay fixed and my battery charged went on my quest started last summer  to find the best Corn Dog I can find. Today Lefty's, and no problem with my overheating, at least no indicator light. It was very warm and windy here north of Chicago today. and I could feel a lot of heat on my right leg, never noticed that before, but I have only owned this bike for just over a year., I am thinking it is normal. Thanks for all the help. The Corn Dog was tied for the best yet, but I learned that Springfield Illinois is the home of the first Corn Dogs, actually Cozy Dog, about five hour drive south.

[jjconeill]

Sorry, replaced fluid it was low new gaskets on cap fixed over heating.

[Laitch]

Thanks for the overheating fix followup and corndog facts!

[noppo]

FYI only - 10 years have passed, and still NO ISSUES with the Spal fan.