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halimjimmy
Samba Member
Joined: March 24, 2015
Posts: 91
Location: Florida
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 Posted: Wed May 27, 2015 12:26 pm Post subject: high idle |
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| I just install a new carb. I don't have timing light but I can feel and hear that the engine is set in high speed. How can I adjust the idle? |
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MagmaJctAz
Samba Member
Joined: November 26, 2011
Posts: 289
Location: Mesa, AZ
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| Posted: Wed May 27, 2015 12:34 pm Post subject: |
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Well, I suppose I could do the extra leg work of searching your profile in hopes of finding where you mentioned the carburetor you have. But why don't you just tell me?
I visit TheSamba during short periods of "free time". These periods are short, limiting my available time to help others.
Having said that. You need to find how the idle speed is controlled on your particular model of carburetor. Most pre-emission control era carburetors, this is done by adjusting the throttle stop.
On later model emission era carburetors, the idle air and fuel bypass the throttle plate. In that case, threading "in" the "bypass-screw" will lower idle speed.
That is, unless you have a large enough intake leak to allow air to bypass the throttle plate. In that case, lowering the idle speed will be near to impossible.
Regards,
Mike
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halimjimmy
Samba Member
Joined: March 24, 2015
Posts: 91
Location: Florida
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| Posted: Wed May 27, 2015 12:38 pm Post subject: |
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| Thank you Mike fr\or your fast reply. My Carb is 34 PICT-3 |
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glutamodo 
The Android
Joined: July 13, 2004
Posts: 26311
Location: Douglas, WY
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| Posted: Wed May 27, 2015 2:35 pm Post subject: |
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Tim Donahoe
Samba Member
Joined: December 08, 2012
Posts: 11740
Location: Redding, CA
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| Posted: Wed May 27, 2015 3:19 pm Post subject: |
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It might be advantageous for you to use a Tachometer. When you adjust the volume control screw to it's highest obtainable level, then back it off 20 or 30 rpms, this is not very noticeable to the ear--the 20 or 30 rpms, that is. A tach. will help you see this slight (but important) drop.
Then, deal with your large Bypass screw for the final procedure.
I like to keep mine closer to 900 rpms. 800 rpms can be too low for some engines, and your engine can stall at stoplights, etc.
Tim
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Richard O'Brien |
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glutamodo
The Android
Joined: July 13, 2004
Posts: 26311
Location: Douglas, WY
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| Posted: Wed May 27, 2015 3:26 pm Post subject: |
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| Yeah, I like 900RPM as well. |
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halimjimmy
Samba Member
Joined: March 24, 2015
Posts: 91
Location: Florida
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| Posted: Wed May 27, 2015 5:46 pm Post subject: |
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| Thanx to Glutamod and Tim. I would like to mentioned that the Carb is brand new just installed last week with new spark plugs, valves had been adjusted and I do have an electronic ignition. |
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