Idle speed drops

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pharmerphil3
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Idle speed drops

Postby pharmerphil3 » Wed Jul 31, 2013 6:43 pm

Using Bill & Rick’s advice, I corrected the timing issue and the Cub idles fine now. However, I have a new problem. When I depress the clutch the idle speed noticeably drops. :? Any suggestions as to what can be causing this? Any help will, once again, be appreciated! :D

Thank you,
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Re: Idle speed drops

Postby Boss Hog » Wed Jul 31, 2013 6:52 pm

That is normal for the older cubs. You are putting pressure on the crankshaft it is most likely moving to the front some and the friction on the bearing all combine to slow down the engine
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Re: Idle speed drops

Postby Eugene » Wed Jul 31, 2013 6:56 pm

And to add what Boss Hog said. Suppose to do that, short answer. So everything is fine.

Cause, the throwout bearing is a solid carbon type puck. When clutch engaged, pressure plate fingers rub the puck, slowing down engine rpms.
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Re: Idle speed drops

Postby pickerandsinger » Thu Aug 01, 2013 6:00 am

Always wondered why it was easier to start in neutral, and why the engine bogged down with the clutch in.....Thanks Boss and Eugene....and :thanx: farmerphil for posting the question....
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Re: Idle speed drops

Postby Rick Spivey » Thu Aug 01, 2013 6:29 am

Although normal, it does remind me that the throwout bearing should be greased annually, using the cheap grease that will separate. Proper greasing could reduce the effect, or at least limit it to only what is normal.
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Re: Idle speed drops

Postby pharmerphil3 » Thu Aug 01, 2013 11:18 am

Thank you guys; this is truly the greatest site for help and information! I really appreciate all of you! :{_}:

Thanks again,
Phil

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Re: Idle speed drops

Postby Smokeycub » Fri Aug 02, 2013 7:57 am

pickerandsinger wrote:Always wondered why it was easier to start in neutral, and why the engine bogged down with the clutch in

It is recommended to start these Cubs in neutral for exactly that reason, and less wear and tear on the driveline and starter.
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Re: Idle speed drops

Postby Boss Hog » Fri Aug 02, 2013 8:53 pm

Smokeycub wrote:
pickerandsinger wrote:Always wondered why it was easier to start in neutral, and why the engine bogged down with the clutch in

It is recommended to start these Cubs in neutral for exactly that reason, and less wear and tear on the driveline and starter.

On the late models you cranked them with the clutch pedal in, as they had a safety switch. The older cubs were cranked in neutral for safety reasons
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