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Post by nicpaige on Jul 5, 2012 19:33:07 GMT -6
Well it looks as if my temp sensor is faulty. Fan doesnt come on even when very hot and I jumped the fan with 12v and it works fine. I would like to temporarily hook up a manual switch. Does anyone see a problem with doing this temporarily? I imagine a ground and 12v to a toggle switch would suffice. Also the rubber cap for the coolant overflow reservoir is cracked badly, Im having a problem finding just the cap....any suggestions?
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Post by JR on Jul 6, 2012 13:58:47 GMT -6
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Post by nulldevice on Jul 6, 2012 18:44:06 GMT -6
I have mounted permanently a manual switch for the fan. If you have a temperature gauge you should be looking at it from time to time anyway. My scooter had the fan turn on before the thermostat for the coolant opened up.
You absolutely need to check the accuracy of your temperature gauge. Mine was showing overheating all the time but a non-contact thermometer showed motor temperatures to be normal.
The overflow tank needs to vent to the atmosphere. I don't recommend the bilge plug.
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Post by JR on Jul 6, 2012 20:37:10 GMT -6
After thinking about it I'll agree on the plug venting although my rubber plug is so tight I don't see how it could vent. But if your fan was coming on before the theromstat opened you had something wrong, either a bad thermostat, air in the system, or a bad thermoswitch or one that was not in the right specs. I'll agree with a occasional glance of the temp gauge heck do that in my car when it's 100F + like it is now but knowing that the scooter is going to run hot without the fan, checking the gauge to see if you need to turn on the fan manually and keeping a good eye on the road all at the same time is why they set it up to come on automatically. Even now with temps at 100F + in my neck of the woods my linhai version doesn't run hot but it's been 3 years since I changed the coolant and I'm going to do that in the next few days, heck too hot to ride so I'll do this in my shop with a cold galss of ice tea and a dang big fan blowing!  JR |
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Post by JR on Jul 7, 2012 21:44:00 GMT -6
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Post by bluesplyr on Jul 8, 2012 21:26:10 GMT -6
If you think this price is high, check out other dirtbag items on ebay, which there are many.  |
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Post by nicpaige on Jul 9, 2012 12:52:31 GMT -6
My cap does not act as a vent there is a seperate hose for that. I hooked up the manual switch and it works well. Keeps it below the high level on gage and no boiling over when I shut it off anymore. didnt help that it has been 99-104 the past week or so. I believe at some point in this scooters life someone took the thermostat out probably thinking this would make it run cooler......EHHHH wrong. Water flowing straight through does not have time to soak up as much heat before entering the radiator where it can be dissipated. Well at least thats what I have learned from my race car, I use restrictors instead of a thermostat in that case. Ill probably stick a thermostat in it when I order the temp switch.
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Post by JR on Jul 16, 2012 21:50:59 GMT -6
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Post by quail on Jul 18, 2012 21:55:44 GMT -6
I have a voltage gauge on my scoot and the fan drops the voltage from 15-16 to 10 volts when it comes on. That voltage drop always seems high to me. But if it is normal a switch on the fan might leave you sitting with a dead battery after a long ride.
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Post by JR on Jul 19, 2012 5:45:10 GMT -6
That's too much! Should only drop about 3 to 3.5 volts. You need to go through the wiring all the way to the fan and even replace it with heavier gauge wire. Also check the wiring pigtail on the fan. It has a little cover that just pops off and the wires are soldierede on and one of mine was just about to come off and it caused high amp load, re-soldiered it and it made a big difference:  I do presume you have the linhai? If so then you have a problem and when you find it you'll find the voltge will be a lot better and the automatic switch is the only way to go, IMO a manual switch is distracting and dangerous. JR |
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Post by cruiser on Jul 19, 2012 19:20:58 GMT -6
I have a voltage gauge on my scoot and the fan drops the voltage from 15-16 to 10 volts when it comes on. That voltage drop always seems high to me. But if it is normal a switch on the fan might leave you sitting with a dead battery after a long ride. That is a very high drop in voltage. My YY250T normally runs at 14.5 volts with a drop to around 14.0 volts with the fan on. JR has good advice on reducing this voltage drop. If this doesn't fix the problem, you may be having problems with the regulator/rectifier. |
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Post by nicpaige on Jul 20, 2012 13:52:28 GMT -6
Thanks for the link for the cap....$1.98 is cheap but the $12.00 shipping hurts!
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Post by quail on Aug 18, 2012 21:25:28 GMT -6
Can someone tell me which direction the rad fan was designed to blow the air on a mc54-250b. I would really like the answer from some one that knows this answer. My thought is toward the engine but I did not do the R&D in the wind tunnel, so what do I know. I also need a new fan, a better fan. any ideas?
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Post by JR on Aug 18, 2012 21:31:40 GMT -6
The fan pulls the air from the front of the scooter through the radiator toward the engine. Also the fan on this scooter now is a over all good fan as far as amp draw and CFM.
JR
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