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Old 03-18-2013, 02:52 PM   #1
BillyD OP
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Joined: Jun 2007
Location: San Mateo County Coast, CA
Oddometer: 632
Auto Decompression Removal 640 LC4

Has anyone permanently removed the auto decompression mechanism?

If so, what have been the consequences? Was anything really been given up?

I'm kind of tired of hearing the thing rattle around in there. Plus, it occasionally kicks in to kill the motor if idle speed drops below 1,600 RPMs for whatever reason.

I know how to use the manual lever...so what's the big deal about NOT having an automatic mechanism?
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KTM '08 690 RFR, '08 990Adv S (carbs), '07 640Adv, '03 540EXC, Ducati 851, Moto Guzzi 850 Lemans, Ercole & 2VT and Yamaha RD350.
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Old 03-18-2013, 06:09 PM   #2
gunnerbuck
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Quote:
Originally Posted by BillyD View Post
Has anyone permanently removed the auto decompression mechanism?

If so, what have been the consequences? Was anything really been given up?

I'm kind of tired of hearing the thing rattle around in there. Plus, it occasionally kicks in to kill the motor if idle speed drops below 1,600 RPMs for whatever reason.

I know how to use the manual lever...so what's the big deal about NOT having an automatic mechanism?
You can remove it and run without... The manual decomp when used properly will take the strain off the starting system much like the auto does... I would suggest to do it at the same time your servicing the cam followers and waterpump as pulling the camshaft out at that point will only be one extra step...
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Old 03-25-2013, 11:07 AM   #3
BillyD OP
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Location: San Mateo County Coast, CA
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The Results are in...

Here's a link to the result of removing the automatic decompression on my 640:

http://www.advrider.com/forums/showt...6#post21030316
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KTM '08 690 RFR, '08 990Adv S (carbs), '07 640Adv, '03 540EXC, Ducati 851, Moto Guzzi 850 Lemans, Ercole & 2VT and Yamaha RD350.
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Old 07-14-2014, 11:46 AM   #4
VictorADV
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Here's a link to the result of removing the automatic decompression on MY 640:
http://www.advrider.com/forums/showt...7#post24613697

hint: you really don't want to remove the autodeco
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