RRRARARARARRR Sound After I Cut Power - Kawasaki Vulcan 750 Forum : Kawasaki VN750 Forums
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post #1 of 8 (permalink) Old 07-02-2009, 04:19 PM Thread Starter
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RRRARARARARRR Sound After I Cut Power

Took it out to test drive my syncs and I get back after a longer ride (my longest yet) and there is this RRRRRRRRAAARARRRRARRAR noise going on after I shut the power off. "Oh, great," I say as I go to look at the cooling fan. Yup, it's not spinning. So, I decide to give it a push with the screw driver... nothing. On the PLUS side it seems like the fan is like just loosely hanging there and maybe it just needs to be put back on... I don't know.

But I can assume that that noise after the power is cut IS my fan TRYING to turn, correct?

-J.O'Ly.
'95 Vucan 750 -- VN750
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post #2 of 8 (permalink) Old 07-02-2009, 04:22 PM
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Originally Posted by SyntaxJO View Post
Took it out to test drive my syncs and I get back after a longer ride (my longest yet) and there is this RRRRRRRRAAARARRRRARRAR noise going on after I shut the power off. "Oh, great," I say as I go to look at the cooling fan. Yup, it's not spinning. So, I decide to give it a push with the screw driver... nothing. On the PLUS side it seems like the fan is like just loosely hanging there and maybe it just needs to be put back on... I don't know.

But I can assume that that noise after the power is cut IS my fan TRYING to turn, correct?
The shaft has stripped out the plastic fan, clean it up and put it back together with some epoxy, or replace the fan.

Yes!! The noise is the fan motor.


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post #3 of 8 (permalink) Old 07-02-2009, 06:06 PM
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bad noise!!

1986 Vn750
18,800 miles, and counting
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post #4 of 8 (permalink) Old 07-02-2009, 06:27 PM Thread Starter
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Would this drain my battery? Because it's dead AGAIN!!!

-J.O'Ly.
'95 Vucan 750 -- VN750
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post #5 of 8 (permalink) Old 07-02-2009, 06:34 PM
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Only if the sound seems to continue for more than a minute after you shut down. The fan is only supposed to run that short time then cut off. If it keeps running, yes , it will drain your battery.

KM

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post #6 of 8 (permalink) Old 07-02-2009, 07:10 PM Thread Starter
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It only does run for a minute - then it shuts down. My theory, however, is since the fan isn't attached that the shaft is spinning faster hence the motor running faster... so even while the bike it running it could be sucking the life out of the battery. Any takers?

-J.O'Ly.
'95 Vucan 750 -- VN750
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post #7 of 8 (permalink) Old 07-02-2009, 07:28 PM
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Quote:
Originally Posted by SyntaxJO View Post
It only does run for a minute - then it shuts down. My theory, however, is since the fan isn't attached that the shaft is spinning faster hence the motor running faster... so even while the bike it running it could be sucking the life out of the battery. Any takers?
The fan usualy will not come on unless you are under 30 mph.


85 VN700 "Old Yella"

REBUILT ENGINE
CUSTOM PAINT
VANCE & HINES CRUZERS
EAR SHAVED AND RE-JETTED W/K&N'S
DUNLOP ELITE K591 FRONT & REAR
VOLTMETER
SYNTHETIC BRAKE FLUID
SYNTHETIC OIL & GEAR LUBE
PLEXISTAR 2 WINDSHIELD
SPLINES LUBED
ACCT'S GREASED W/TOC SPRINGS
COASTERD
LEATHER SADDLE BAGS
LEATHER TOOL AND ROLL BAG
PICKUP COILS GAPPED AT .018"
NGK CAP, WIRES, IRIDUMS
BARNETT FRICTION PLATES & SPRINGS
CUSTOM GRIPS, MIRRORS, LEVERS
ORIGINAL STATOR & R/R 14.5v
DEKA MF AGM ETX15L

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post #8 of 8 (permalink) Old 07-02-2009, 07:58 PM
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Quote:
Originally Posted by SyntaxJO View Post
It only does run for a minute - then it shuts down. My theory, however, is since the fan isn't attached that the shaft is spinning faster hence the motor running faster... so even while the bike it running it could be sucking the life out of the battery. Any takers?
Yeah. The motor will always turn at the same speed unless there is a load on it... Take the fan off and it will turn at the same speed it was before, (unless you have a massive fan blade)

Without the weight of the fan blade the motor in theory would use less power....making you concept the exact opposite of what actualy happpens. But you'd never be able to measure the difference with common multi-testers.Basicly the power use is the same.

For example, your Dremel tool can spin at 20,000 rpms without an attachment. Put one on, and it may take a nano secound more to reach it, but it will still turn at 20,000 rpms. That is the set speed of the motor.
Take the tool and press the attatchment against a work surface and if you apply too much pressure, you can not only slow the motor down, but make it stop.

If your battery is die'n it is because you either have a bad battery, your charging system is not working, or you have a crossed circuit somewhere that is shorting out the battery. Or some or all of the above. The fan motor uses the same power whether the fan blade is connected or not. And as this does not normaly hurt the battery I would guess you have other issues besides the broken fan blade.


KM

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Last edited by Knifemaker; 07-02-2009 at 08:01 PM.
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